diff --git a/dist/index.d.mts b/dist/index.d.mts
index a66d061f466c89a57efec33f37b7daabaaba2892..15f1b2aca0c0b43e5e1f8baddd2669c074912d18 100644
--- a/dist/index.d.mts
+++ b/dist/index.d.mts
@@ -211,9 +211,21 @@ declare const anthropicLanguageModelOptions: z.ZodObject<{
             omitted: "omitted";
             summarized: "summarized";
         }>>;
+        blockBinding: z.ZodOptional<z.ZodObject<{
+            prefixMismatchBehavior: z.ZodEnum<{
+                error: "error";
+                drop_block: "drop_block";
+            }>;
+        }, z.core.$strip>>;
     }, z.core.$strip>, z.ZodObject<{
         type: z.ZodLiteral<"enabled">;
         budgetTokens: z.ZodOptional<z.ZodNumber>;
+        blockBinding: z.ZodOptional<z.ZodObject<{
+            prefixMismatchBehavior: z.ZodEnum<{
+                error: "error";
+                drop_block: "drop_block";
+            }>;
+        }, z.core.$strip>>;
     }, z.core.$strip>, z.ZodObject<{
         type: z.ZodLiteral<"disabled">;
     }, z.core.$strip>]>>;
diff --git a/dist/index.d.ts b/dist/index.d.ts
index a66d061f466c89a57efec33f37b7daabaaba2892..15f1b2aca0c0b43e5e1f8baddd2669c074912d18 100644
--- a/dist/index.d.ts
+++ b/dist/index.d.ts
@@ -211,9 +211,21 @@ declare const anthropicLanguageModelOptions: z.ZodObject<{
             omitted: "omitted";
             summarized: "summarized";
         }>>;
+        blockBinding: z.ZodOptional<z.ZodObject<{
+            prefixMismatchBehavior: z.ZodEnum<{
+                error: "error";
+                drop_block: "drop_block";
+            }>;
+        }, z.core.$strip>>;
     }, z.core.$strip>, z.ZodObject<{
         type: z.ZodLiteral<"enabled">;
         budgetTokens: z.ZodOptional<z.ZodNumber>;
+        blockBinding: z.ZodOptional<z.ZodObject<{
+            prefixMismatchBehavior: z.ZodEnum<{
+                error: "error";
+                drop_block: "drop_block";
+            }>;
+        }, z.core.$strip>>;
     }, z.core.$strip>, z.ZodObject<{
         type: z.ZodLiteral<"disabled">;
     }, z.core.$strip>]>>;
diff --git a/dist/index.js b/dist/index.js
index 88c1aa865339baa320cf80ec543bed865825bc61..5006e82b0edd9676d1650cc94ecb573a2810acce 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -85,6 +85,13 @@ var anthropicMessagesResponseSchema = (0, import_provider_utils2.lazySchema)(
       type: import_v42.z.literal("message"),
       id: import_v42.z.string().nullish(),
       model: import_v42.z.string().nullish(),
+      input_transformations: import_v42.z.array(
+        import_v42.z.looseObject({
+          type: import_v42.z.string(),
+          path: import_v42.z.string().nullish(),
+          reason: import_v42.z.string().nullish()
+        })
+      ).nullish(),
       content: import_v42.z.array(
         import_v42.z.discriminatedUnion("type", [
           import_v42.z.object({
@@ -424,6 +431,13 @@ var anthropicMessagesChunkSchema = (0, import_provider_utils2.lazySchema)(
           id: import_v42.z.string().nullish(),
           model: import_v42.z.string().nullish(),
           role: import_v42.z.string().nullish(),
+          input_transformations: import_v42.z.array(
+            import_v42.z.looseObject({
+              type: import_v42.z.string(),
+              path: import_v42.z.string().nullish(),
+              reason: import_v42.z.string().nullish()
+            })
+          ).nullish(),
           usage: import_v42.z.looseObject({
             input_tokens: import_v42.z.number(),
             cache_creation_input_tokens: import_v42.z.number().nullish(),
@@ -923,12 +937,18 @@ var anthropicLanguageModelOptions = import_v43.z.object({
        * - `"omitted"`: Thinking blocks are present but text is empty (default for Opus 4.7+).
        * - `"summarized"`: Thinking content is returned. Required to see reasoning output.
        */
-      display: import_v43.z.enum(["omitted", "summarized"]).optional()
+      display: import_v43.z.enum(["omitted", "summarized"]).optional(),
+      blockBinding: import_v43.z.object({
+        prefixMismatchBehavior: import_v43.z.enum(["error", "drop_block"])
+      }).optional()
     }),
     import_v43.z.object({
       /** for models before Opus 4.6, except Sonnet 4.6 still supports it */
       type: import_v43.z.literal("enabled"),
-      budgetTokens: import_v43.z.number().optional()
+      budgetTokens: import_v43.z.number().optional(),
+      blockBinding: import_v43.z.object({
+        prefixMismatchBehavior: import_v43.z.enum(["error", "drop_block"])
+      }).optional()
     }),
     import_v43.z.object({
       type: import_v43.z.literal("disabled")
@@ -3568,6 +3588,7 @@ var AnthropicMessagesLanguageModel = class {
     const sendThinking = isThinking || thinkingType === "disabled";
     let thinkingBudget = thinkingType === "enabled" ? (_g = anthropicOptions == null ? void 0 : anthropicOptions.thinking) == null ? void 0 : _g.budgetTokens : void 0;
     const thinkingDisplay = thinkingType === "adaptive" ? (_h = anthropicOptions == null ? void 0 : anthropicOptions.thinking) == null ? void 0 : _h.display : void 0;
+    const thinkingBlockBinding = isThinking ? (anthropicOptions == null ? void 0 : anthropicOptions.thinking) == null ? void 0 : anthropicOptions.thinking.blockBinding : void 0;
     const maxTokens = maxOutputTokens != null ? maxOutputTokens : maxOutputTokensForModel;
     const baseArgs = {
       // model id:
@@ -3583,7 +3604,12 @@ var AnthropicMessagesLanguageModel = class {
         thinking: {
           type: thinkingType,
           ...thinkingBudget != null && { budget_tokens: thinkingBudget },
-          ...thinkingDisplay != null && { display: thinkingDisplay }
+          ...thinkingDisplay != null && { display: thinkingDisplay },
+          ...thinkingBlockBinding != null && {
+            block_binding: {
+              prefix_mismatch_behavior: thinkingBlockBinding.prefixMismatchBehavior
+            }
+          }
         }
       },
       ...((anthropicOptions == null ? void 0 : anthropicOptions.effort) || (anthropicOptions == null ? void 0 : anthropicOptions.taskBudget) || useStructuredOutput && (responseFormat == null ? void 0 : responseFormat.type) === "json" && responseFormat.schema != null) && {
@@ -3798,6 +3824,9 @@ var AnthropicMessagesLanguageModel = class {
     } else if ((anthropicOptions == null ? void 0 : anthropicOptions.fallbacks) && anthropicOptions.fallbacks.length > 0) {
       betas.add("server-side-fallback-2026-06-01");
     }
+    if (thinkingBlockBinding != null) {
+      betas.add("thinking-binding-controls-2026-08-01");
+    }
     const defaultEagerInputStreaming = stream && ((_j = anthropicOptions == null ? void 0 : anthropicOptions.toolStreaming) != null ? _j : true);
     const {
       tools: anthropicTools2,
@@ -4364,6 +4393,7 @@ var AnthropicMessagesLanguageModel = class {
           cacheCreationInputTokens: (_a2 = response.usage.cache_creation_input_tokens) != null ? _a2 : null,
           stopSequence: (_b2 = response.stop_sequence) != null ? _b2 : null,
           ...stopDetails != null ? { stopDetails } : {},
+          ...response.input_transformations != null ? { inputTransformations: response.input_transformations } : {},
           iterations: response.usage.iterations ? response.usage.iterations.map(
             (iter) => ({
               type: iter.type,
@@ -4453,6 +4483,7 @@ var AnthropicMessagesLanguageModel = class {
     let cacheCreationInputTokens = null;
     let stopSequence = null;
     let stopDetails = void 0;
+    let inputTransformations = void 0;
     let container = null;
     let isJsonResponseFromTool = false;
     let isMessageOpen = false;
@@ -5111,6 +5142,9 @@ var AnthropicMessagesLanguageModel = class {
               isMessageOpen = true;
               activeMessageId = value.message.id;
               usage.input_tokens = value.message.usage.input_tokens;
+              if (value.message.input_transformations != null) {
+                inputTransformations = value.message.input_transformations;
+              }
               usage.cache_read_input_tokens = (_e = value.message.usage.cache_read_input_tokens) != null ? _e : 0;
               usage.cache_creation_input_tokens = (_f = value.message.usage.cache_creation_input_tokens) != null ? _f : 0;
               rawUsage = {
@@ -5231,6 +5265,7 @@ var AnthropicMessagesLanguageModel = class {
                 cacheCreationInputTokens,
                 stopSequence,
                 ...stopDetails != null ? { stopDetails } : {},
+                ...inputTransformations != null ? { inputTransformations } : {},
                 iterations: usage.iterations ? usage.iterations.map(
                   (iter) => ({
                     type: iter.type,
diff --git a/dist/index.mjs b/dist/index.mjs
index 593b030c7f2adbe0cd38556b7a74f5ede6a5435e..1fa36ccb119715df3cd00976e479c679c66d2261 100644
--- a/dist/index.mjs
+++ b/dist/index.mjs
@@ -85,6 +85,13 @@ var anthropicMessagesResponseSchema = lazySchema2(
       type: z2.literal("message"),
       id: z2.string().nullish(),
       model: z2.string().nullish(),
+      input_transformations: z2.array(
+        z2.looseObject({
+          type: z2.string(),
+          path: z2.string().nullish(),
+          reason: z2.string().nullish()
+        })
+      ).nullish(),
       content: z2.array(
         z2.discriminatedUnion("type", [
           z2.object({
@@ -424,6 +431,13 @@ var anthropicMessagesChunkSchema = lazySchema2(
           id: z2.string().nullish(),
           model: z2.string().nullish(),
           role: z2.string().nullish(),
+          input_transformations: z2.array(
+            z2.looseObject({
+              type: z2.string(),
+              path: z2.string().nullish(),
+              reason: z2.string().nullish()
+            })
+          ).nullish(),
           usage: z2.looseObject({
             input_tokens: z2.number(),
             cache_creation_input_tokens: z2.number().nullish(),
@@ -923,12 +937,18 @@ var anthropicLanguageModelOptions = z3.object({
        * - `"omitted"`: Thinking blocks are present but text is empty (default for Opus 4.7+).
        * - `"summarized"`: Thinking content is returned. Required to see reasoning output.
        */
-      display: z3.enum(["omitted", "summarized"]).optional()
+      display: z3.enum(["omitted", "summarized"]).optional(),
+      blockBinding: z3.object({
+        prefixMismatchBehavior: z3.enum(["error", "drop_block"])
+      }).optional()
     }),
     z3.object({
       /** for models before Opus 4.6, except Sonnet 4.6 still supports it */
       type: z3.literal("enabled"),
-      budgetTokens: z3.number().optional()
+      budgetTokens: z3.number().optional(),
+      blockBinding: z3.object({
+        prefixMismatchBehavior: z3.enum(["error", "drop_block"])
+      }).optional()
     }),
     z3.object({
       type: z3.literal("disabled")
@@ -3620,6 +3640,7 @@ var AnthropicMessagesLanguageModel = class {
     const sendThinking = isThinking || thinkingType === "disabled";
     let thinkingBudget = thinkingType === "enabled" ? (_g = anthropicOptions == null ? void 0 : anthropicOptions.thinking) == null ? void 0 : _g.budgetTokens : void 0;
     const thinkingDisplay = thinkingType === "adaptive" ? (_h = anthropicOptions == null ? void 0 : anthropicOptions.thinking) == null ? void 0 : _h.display : void 0;
+    const thinkingBlockBinding = isThinking ? (anthropicOptions == null ? void 0 : anthropicOptions.thinking) == null ? void 0 : anthropicOptions.thinking.blockBinding : void 0;
     const maxTokens = maxOutputTokens != null ? maxOutputTokens : maxOutputTokensForModel;
     const baseArgs = {
       // model id:
@@ -3635,7 +3656,12 @@ var AnthropicMessagesLanguageModel = class {
         thinking: {
           type: thinkingType,
           ...thinkingBudget != null && { budget_tokens: thinkingBudget },
-          ...thinkingDisplay != null && { display: thinkingDisplay }
+          ...thinkingDisplay != null && { display: thinkingDisplay },
+          ...thinkingBlockBinding != null && {
+            block_binding: {
+              prefix_mismatch_behavior: thinkingBlockBinding.prefixMismatchBehavior
+            }
+          }
         }
       },
       ...((anthropicOptions == null ? void 0 : anthropicOptions.effort) || (anthropicOptions == null ? void 0 : anthropicOptions.taskBudget) || useStructuredOutput && (responseFormat == null ? void 0 : responseFormat.type) === "json" && responseFormat.schema != null) && {
@@ -3850,6 +3876,9 @@ var AnthropicMessagesLanguageModel = class {
     } else if ((anthropicOptions == null ? void 0 : anthropicOptions.fallbacks) && anthropicOptions.fallbacks.length > 0) {
       betas.add("server-side-fallback-2026-06-01");
     }
+    if (thinkingBlockBinding != null) {
+      betas.add("thinking-binding-controls-2026-08-01");
+    }
     const defaultEagerInputStreaming = stream && ((_j = anthropicOptions == null ? void 0 : anthropicOptions.toolStreaming) != null ? _j : true);
     const {
       tools: anthropicTools2,
@@ -4416,6 +4445,7 @@ var AnthropicMessagesLanguageModel = class {
           cacheCreationInputTokens: (_a2 = response.usage.cache_creation_input_tokens) != null ? _a2 : null,
           stopSequence: (_b2 = response.stop_sequence) != null ? _b2 : null,
           ...stopDetails != null ? { stopDetails } : {},
+          ...response.input_transformations != null ? { inputTransformations: response.input_transformations } : {},
           iterations: response.usage.iterations ? response.usage.iterations.map(
             (iter) => ({
               type: iter.type,
@@ -4505,6 +4535,7 @@ var AnthropicMessagesLanguageModel = class {
     let cacheCreationInputTokens = null;
     let stopSequence = null;
     let stopDetails = void 0;
+    let inputTransformations = void 0;
     let container = null;
     let isJsonResponseFromTool = false;
     let isMessageOpen = false;
@@ -5163,6 +5194,9 @@ var AnthropicMessagesLanguageModel = class {
               isMessageOpen = true;
               activeMessageId = value.message.id;
               usage.input_tokens = value.message.usage.input_tokens;
+              if (value.message.input_transformations != null) {
+                inputTransformations = value.message.input_transformations;
+              }
               usage.cache_read_input_tokens = (_e = value.message.usage.cache_read_input_tokens) != null ? _e : 0;
               usage.cache_creation_input_tokens = (_f = value.message.usage.cache_creation_input_tokens) != null ? _f : 0;
               rawUsage = {
@@ -5283,6 +5317,7 @@ var AnthropicMessagesLanguageModel = class {
                 cacheCreationInputTokens,
                 stopSequence,
                 ...stopDetails != null ? { stopDetails } : {},
+                ...inputTransformations != null ? { inputTransformations } : {},
                 iterations: usage.iterations ? usage.iterations.map(
                   (iter) => ({
                     type: iter.type,
diff --git a/dist/internal/index.js b/dist/internal/index.js
index 701ca5a333d83d384f682667b9976b7f72b0de37..ce53d0c9fe5c00a092b0347b45d61d8ce9c3a79a 100644
--- a/dist/internal/index.js
+++ b/dist/internal/index.js
@@ -79,6 +79,13 @@ var anthropicMessagesResponseSchema = (0, import_provider_utils2.lazySchema)(
       type: import_v42.z.literal("message"),
       id: import_v42.z.string().nullish(),
       model: import_v42.z.string().nullish(),
+      input_transformations: import_v42.z.array(
+        import_v42.z.looseObject({
+          type: import_v42.z.string(),
+          path: import_v42.z.string().nullish(),
+          reason: import_v42.z.string().nullish()
+        })
+      ).nullish(),
       content: import_v42.z.array(
         import_v42.z.discriminatedUnion("type", [
           import_v42.z.object({
@@ -418,6 +425,13 @@ var anthropicMessagesChunkSchema = (0, import_provider_utils2.lazySchema)(
           id: import_v42.z.string().nullish(),
           model: import_v42.z.string().nullish(),
           role: import_v42.z.string().nullish(),
+          input_transformations: import_v42.z.array(
+            import_v42.z.looseObject({
+              type: import_v42.z.string(),
+              path: import_v42.z.string().nullish(),
+              reason: import_v42.z.string().nullish()
+            })
+          ).nullish(),
           usage: import_v42.z.looseObject({
             input_tokens: import_v42.z.number(),
             cache_creation_input_tokens: import_v42.z.number().nullish(),
@@ -917,12 +931,18 @@ var anthropicLanguageModelOptions = import_v43.z.object({
        * - `"omitted"`: Thinking blocks are present but text is empty (default for Opus 4.7+).
        * - `"summarized"`: Thinking content is returned. Required to see reasoning output.
        */
-      display: import_v43.z.enum(["omitted", "summarized"]).optional()
+      display: import_v43.z.enum(["omitted", "summarized"]).optional(),
+      blockBinding: import_v43.z.object({
+        prefixMismatchBehavior: import_v43.z.enum(["error", "drop_block"])
+      }).optional()
     }),
     import_v43.z.object({
       /** for models before Opus 4.6, except Sonnet 4.6 still supports it */
       type: import_v43.z.literal("enabled"),
-      budgetTokens: import_v43.z.number().optional()
+      budgetTokens: import_v43.z.number().optional(),
+      blockBinding: import_v43.z.object({
+        prefixMismatchBehavior: import_v43.z.enum(["error", "drop_block"])
+      }).optional()
     }),
     import_v43.z.object({
       type: import_v43.z.literal("disabled")
@@ -3562,6 +3582,7 @@ var AnthropicMessagesLanguageModel = class {
     const sendThinking = isThinking || thinkingType === "disabled";
     let thinkingBudget = thinkingType === "enabled" ? (_g = anthropicOptions == null ? void 0 : anthropicOptions.thinking) == null ? void 0 : _g.budgetTokens : void 0;
     const thinkingDisplay = thinkingType === "adaptive" ? (_h = anthropicOptions == null ? void 0 : anthropicOptions.thinking) == null ? void 0 : _h.display : void 0;
+    const thinkingBlockBinding = isThinking ? (anthropicOptions == null ? void 0 : anthropicOptions.thinking) == null ? void 0 : anthropicOptions.thinking.blockBinding : void 0;
     const maxTokens = maxOutputTokens != null ? maxOutputTokens : maxOutputTokensForModel;
     const baseArgs = {
       // model id:
@@ -3577,7 +3598,12 @@ var AnthropicMessagesLanguageModel = class {
         thinking: {
           type: thinkingType,
           ...thinkingBudget != null && { budget_tokens: thinkingBudget },
-          ...thinkingDisplay != null && { display: thinkingDisplay }
+          ...thinkingDisplay != null && { display: thinkingDisplay },
+          ...thinkingBlockBinding != null && {
+            block_binding: {
+              prefix_mismatch_behavior: thinkingBlockBinding.prefixMismatchBehavior
+            }
+          }
         }
       },
       ...((anthropicOptions == null ? void 0 : anthropicOptions.effort) || (anthropicOptions == null ? void 0 : anthropicOptions.taskBudget) || useStructuredOutput && (responseFormat == null ? void 0 : responseFormat.type) === "json" && responseFormat.schema != null) && {
@@ -3792,6 +3818,9 @@ var AnthropicMessagesLanguageModel = class {
     } else if ((anthropicOptions == null ? void 0 : anthropicOptions.fallbacks) && anthropicOptions.fallbacks.length > 0) {
       betas.add("server-side-fallback-2026-06-01");
     }
+    if (thinkingBlockBinding != null) {
+      betas.add("thinking-binding-controls-2026-08-01");
+    }
     const defaultEagerInputStreaming = stream && ((_j = anthropicOptions == null ? void 0 : anthropicOptions.toolStreaming) != null ? _j : true);
     const {
       tools: anthropicTools2,
@@ -4358,6 +4387,7 @@ var AnthropicMessagesLanguageModel = class {
           cacheCreationInputTokens: (_a2 = response.usage.cache_creation_input_tokens) != null ? _a2 : null,
           stopSequence: (_b2 = response.stop_sequence) != null ? _b2 : null,
           ...stopDetails != null ? { stopDetails } : {},
+          ...response.input_transformations != null ? { inputTransformations: response.input_transformations } : {},
           iterations: response.usage.iterations ? response.usage.iterations.map(
             (iter) => ({
               type: iter.type,
@@ -4447,6 +4477,7 @@ var AnthropicMessagesLanguageModel = class {
     let cacheCreationInputTokens = null;
     let stopSequence = null;
     let stopDetails = void 0;
+    let inputTransformations = void 0;
     let container = null;
     let isJsonResponseFromTool = false;
     let isMessageOpen = false;
@@ -5105,6 +5136,9 @@ var AnthropicMessagesLanguageModel = class {
               isMessageOpen = true;
               activeMessageId = value.message.id;
               usage.input_tokens = value.message.usage.input_tokens;
+              if (value.message.input_transformations != null) {
+                inputTransformations = value.message.input_transformations;
+              }
               usage.cache_read_input_tokens = (_e = value.message.usage.cache_read_input_tokens) != null ? _e : 0;
               usage.cache_creation_input_tokens = (_f = value.message.usage.cache_creation_input_tokens) != null ? _f : 0;
               rawUsage = {
@@ -5225,6 +5259,7 @@ var AnthropicMessagesLanguageModel = class {
                 cacheCreationInputTokens,
                 stopSequence,
                 ...stopDetails != null ? { stopDetails } : {},
+                ...inputTransformations != null ? { inputTransformations } : {},
                 iterations: usage.iterations ? usage.iterations.map(
                   (iter) => ({
                     type: iter.type,
diff --git a/dist/internal/index.mjs b/dist/internal/index.mjs
index c11f29fa42a9ce6a5681d43c609020f1f4a616da..df7f7a01992a56826eb809e6cdfb1e50a87a1b90 100644
--- a/dist/internal/index.mjs
+++ b/dist/internal/index.mjs
@@ -69,6 +69,13 @@ var anthropicMessagesResponseSchema = lazySchema2(
       type: z2.literal("message"),
       id: z2.string().nullish(),
       model: z2.string().nullish(),
+      input_transformations: z2.array(
+        z2.looseObject({
+          type: z2.string(),
+          path: z2.string().nullish(),
+          reason: z2.string().nullish()
+        })
+      ).nullish(),
       content: z2.array(
         z2.discriminatedUnion("type", [
           z2.object({
@@ -408,6 +415,13 @@ var anthropicMessagesChunkSchema = lazySchema2(
           id: z2.string().nullish(),
           model: z2.string().nullish(),
           role: z2.string().nullish(),
+          input_transformations: z2.array(
+            z2.looseObject({
+              type: z2.string(),
+              path: z2.string().nullish(),
+              reason: z2.string().nullish()
+            })
+          ).nullish(),
           usage: z2.looseObject({
             input_tokens: z2.number(),
             cache_creation_input_tokens: z2.number().nullish(),
@@ -907,12 +921,18 @@ var anthropicLanguageModelOptions = z3.object({
        * - `"omitted"`: Thinking blocks are present but text is empty (default for Opus 4.7+).
        * - `"summarized"`: Thinking content is returned. Required to see reasoning output.
        */
-      display: z3.enum(["omitted", "summarized"]).optional()
+      display: z3.enum(["omitted", "summarized"]).optional(),
+      blockBinding: z3.object({
+        prefixMismatchBehavior: z3.enum(["error", "drop_block"])
+      }).optional()
     }),
     z3.object({
       /** for models before Opus 4.6, except Sonnet 4.6 still supports it */
       type: z3.literal("enabled"),
-      budgetTokens: z3.number().optional()
+      budgetTokens: z3.number().optional(),
+      blockBinding: z3.object({
+        prefixMismatchBehavior: z3.enum(["error", "drop_block"])
+      }).optional()
     }),
     z3.object({
       type: z3.literal("disabled")
@@ -3604,6 +3624,7 @@ var AnthropicMessagesLanguageModel = class {
     const sendThinking = isThinking || thinkingType === "disabled";
     let thinkingBudget = thinkingType === "enabled" ? (_g = anthropicOptions == null ? void 0 : anthropicOptions.thinking) == null ? void 0 : _g.budgetTokens : void 0;
     const thinkingDisplay = thinkingType === "adaptive" ? (_h = anthropicOptions == null ? void 0 : anthropicOptions.thinking) == null ? void 0 : _h.display : void 0;
+    const thinkingBlockBinding = isThinking ? (anthropicOptions == null ? void 0 : anthropicOptions.thinking) == null ? void 0 : anthropicOptions.thinking.blockBinding : void 0;
     const maxTokens = maxOutputTokens != null ? maxOutputTokens : maxOutputTokensForModel;
     const baseArgs = {
       // model id:
@@ -3619,7 +3640,12 @@ var AnthropicMessagesLanguageModel = class {
         thinking: {
           type: thinkingType,
           ...thinkingBudget != null && { budget_tokens: thinkingBudget },
-          ...thinkingDisplay != null && { display: thinkingDisplay }
+          ...thinkingDisplay != null && { display: thinkingDisplay },
+          ...thinkingBlockBinding != null && {
+            block_binding: {
+              prefix_mismatch_behavior: thinkingBlockBinding.prefixMismatchBehavior
+            }
+          }
         }
       },
       ...((anthropicOptions == null ? void 0 : anthropicOptions.effort) || (anthropicOptions == null ? void 0 : anthropicOptions.taskBudget) || useStructuredOutput && (responseFormat == null ? void 0 : responseFormat.type) === "json" && responseFormat.schema != null) && {
@@ -3834,6 +3860,9 @@ var AnthropicMessagesLanguageModel = class {
     } else if ((anthropicOptions == null ? void 0 : anthropicOptions.fallbacks) && anthropicOptions.fallbacks.length > 0) {
       betas.add("server-side-fallback-2026-06-01");
     }
+    if (thinkingBlockBinding != null) {
+      betas.add("thinking-binding-controls-2026-08-01");
+    }
     const defaultEagerInputStreaming = stream && ((_j = anthropicOptions == null ? void 0 : anthropicOptions.toolStreaming) != null ? _j : true);
     const {
       tools: anthropicTools2,
@@ -4400,6 +4429,7 @@ var AnthropicMessagesLanguageModel = class {
           cacheCreationInputTokens: (_a2 = response.usage.cache_creation_input_tokens) != null ? _a2 : null,
           stopSequence: (_b2 = response.stop_sequence) != null ? _b2 : null,
           ...stopDetails != null ? { stopDetails } : {},
+          ...response.input_transformations != null ? { inputTransformations: response.input_transformations } : {},
           iterations: response.usage.iterations ? response.usage.iterations.map(
             (iter) => ({
               type: iter.type,
@@ -4489,6 +4519,7 @@ var AnthropicMessagesLanguageModel = class {
     let cacheCreationInputTokens = null;
     let stopSequence = null;
     let stopDetails = void 0;
+    let inputTransformations = void 0;
     let container = null;
     let isJsonResponseFromTool = false;
     let isMessageOpen = false;
@@ -5147,6 +5178,9 @@ var AnthropicMessagesLanguageModel = class {
               isMessageOpen = true;
               activeMessageId = value.message.id;
               usage.input_tokens = value.message.usage.input_tokens;
+              if (value.message.input_transformations != null) {
+                inputTransformations = value.message.input_transformations;
+              }
               usage.cache_read_input_tokens = (_e = value.message.usage.cache_read_input_tokens) != null ? _e : 0;
               usage.cache_creation_input_tokens = (_f = value.message.usage.cache_creation_input_tokens) != null ? _f : 0;
               rawUsage = {
@@ -5267,6 +5301,7 @@ var AnthropicMessagesLanguageModel = class {
                 cacheCreationInputTokens,
                 stopSequence,
                 ...stopDetails != null ? { stopDetails } : {},
+                ...inputTransformations != null ? { inputTransformations } : {},
                 iterations: usage.iterations ? usage.iterations.map(
                   (iter) => ({
                     type: iter.type,