diff --git a/packages/ai/src/providers/amazon-bedrock-mantle.ts b/packages/ai/src/providers/amazon-bedrock-mantle.ts
index 07ff59855fdd..7e051828137a 100644
--- a/packages/ai/src/providers/amazon-bedrock-mantle.ts
+++ b/packages/ai/src/providers/amazon-bedrock-mantle.ts
@@ -164,8 +164,8 @@ const fromSettings = ({
     baseURL,
     credentials,
     generation: topP === undefined ? undefined : { topP },
-    headers: headers === undefined ? undefined : { ...headers },
-    http: body === undefined ? undefined : { body: { ...body } },
+    headers,
+    http: body === undefined ? undefined : { body },
     profile,
     providerOptions,
     region,
diff --git a/packages/ai/src/providers/anthropic-compatible.ts b/packages/ai/src/providers/anthropic-compatible.ts
index 2a4cb1b8a9da..598ad78ab4af 100644
--- a/packages/ai/src/providers/anthropic-compatible.ts
+++ b/packages/ai/src/providers/anthropic-compatible.ts
@@ -74,8 +74,8 @@ export const model: ProviderPackage.Definition<Settings, AnthropicMessages.Provi
   return configure({
     ...(authToken === undefined ? { apiKey: apiKey } : { auth: Auth.bearer(authToken) }),
     baseURL,
-    headers: headers === undefined ? undefined : { ...headers },
-    http: body === undefined ? undefined : { body: { ...body } },
+    headers,
+    http: body === undefined ? undefined : { body },
     provider,
     providerOptions,
   }).model(modelID)
diff --git a/packages/ai/src/providers/anthropic.ts b/packages/ai/src/providers/anthropic.ts
index feb3359bf1d7..9c226e9f3bbb 100644
--- a/packages/ai/src/providers/anthropic.ts
+++ b/packages/ai/src/providers/anthropic.ts
@@ -64,8 +64,8 @@ export const model: ProviderPackage.Definition<Settings, AnthropicMessages.Provi
   return configure({
     ...(authToken === undefined ? { apiKey: apiKey } : { auth: Auth.bearer(authToken) }),
     baseURL,
-    headers: headers === undefined ? undefined : { ...headers },
-    http: body === undefined ? undefined : { body: { ...body } },
+    headers,
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).model(modelID)
 }
diff --git a/packages/ai/src/providers/azure.ts b/packages/ai/src/providers/azure.ts
index 8176a664da0f..548e956377a5 100644
--- a/packages/ai/src/providers/azure.ts
+++ b/packages/ai/src/providers/azure.ts
@@ -159,8 +159,8 @@ const config = ({
   const common = {
     apiKey,
     apiVersion,
-    headers: headers === undefined ? undefined : { ...headers },
-    http: body === undefined ? undefined : { body: { ...body } },
+    headers,
+    http: body === undefined ? undefined : { body },
     providerOptions,
     queryParams: queryParams === undefined ? undefined : { ...queryParams },
     useDeploymentBasedUrls,
diff --git a/packages/ai/src/providers/baseten.ts b/packages/ai/src/providers/baseten.ts
index 786cacf77981..2752d2e173b6 100644
--- a/packages/ai/src/providers/baseten.ts
+++ b/packages/ai/src/providers/baseten.ts
@@ -55,8 +55,8 @@ export const model: ProviderPackage.Definition<Settings, OpenAIProviderOptionsIn
   configure({
     apiKey,
     baseURL,
-    headers: headers === undefined ? undefined : { ...headers },
-    http: body === undefined ? undefined : { body: { ...body } },
+    headers,
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).model(modelID)
 
diff --git a/packages/ai/src/providers/cerebras.ts b/packages/ai/src/providers/cerebras.ts
index fb89a6171cb9..f41d4381ffa9 100644
--- a/packages/ai/src/providers/cerebras.ts
+++ b/packages/ai/src/providers/cerebras.ts
@@ -64,7 +64,7 @@ export const model: ProviderPackage.Definition<Settings, OpenAIProviderOptionsIn
   configure({
     apiKey,
     baseURL,
-    headers: headers === undefined ? undefined : { ...headers },
-    http: body === undefined ? undefined : { body: { ...body } },
+    headers,
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).model(modelID)
diff --git a/packages/ai/src/providers/cloudflare-ai-gateway.ts b/packages/ai/src/providers/cloudflare-ai-gateway.ts
index a122e98da567..d5beba1bc12e 100644
--- a/packages/ai/src/providers/cloudflare-ai-gateway.ts
+++ b/packages/ai/src/providers/cloudflare-ai-gateway.ts
@@ -166,8 +166,8 @@ export const model: ProviderPackage.Definition<Settings, OpenAIProviderOptionsIn
     collectLog,
     gatewayApiKey,
     gatewayId,
-    headers: headers === undefined ? undefined : { ...headers },
-    http: body === undefined ? undefined : { body: { ...body } },
+    headers,
+    http: body === undefined ? undefined : { body },
     metadata,
     providerOptions,
     skipCache,
diff --git a/packages/ai/src/providers/cloudflare-workers-ai.ts b/packages/ai/src/providers/cloudflare-workers-ai.ts
index 6c53c3020395..160093a1de4e 100644
--- a/packages/ai/src/providers/cloudflare-workers-ai.ts
+++ b/packages/ai/src/providers/cloudflare-workers-ai.ts
@@ -68,8 +68,8 @@ export const model: ProviderPackage.Definition<Settings, OpenAIProviderOptionsIn
   return configure({
     apiKey,
     baseURL: baseURL(settings),
-    headers: headers === undefined ? undefined : { ...headers },
-    http: body === undefined ? undefined : { body: { ...body } },
+    headers,
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).model(modelID)
 }
diff --git a/packages/ai/src/providers/cohere.ts b/packages/ai/src/providers/cohere.ts
index e22350228edd..552af47f73b8 100644
--- a/packages/ai/src/providers/cohere.ts
+++ b/packages/ai/src/providers/cohere.ts
@@ -60,7 +60,7 @@ export const model: ProviderPackage.Definition<Settings, CohereChat.ProviderOpti
     apiKey,
     baseURL,
     headers,
-    http: body === undefined ? undefined : { body: { ...body } },
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).model(modelID)
 export * as Cohere from "./cohere.js"
diff --git a/packages/ai/src/providers/cohere/chat.ts b/packages/ai/src/providers/cohere/chat.ts
index 6a1013a9f16c..5bcc7224d57c 100644
--- a/packages/ai/src/providers/cohere/chat.ts
+++ b/packages/ai/src/providers/cohere/chat.ts
@@ -11,6 +11,6 @@ export const model: ProviderPackage.Definition<Settings, Cohere.ChatOptionsInput
     apiKey,
     baseURL,
     headers,
-    http: body === undefined ? undefined : { body: { ...body } },
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).chat(modelID)
diff --git a/packages/ai/src/providers/deepinfra.ts b/packages/ai/src/providers/deepinfra.ts
index 061f3bc0765c..18724a41e85a 100644
--- a/packages/ai/src/providers/deepinfra.ts
+++ b/packages/ai/src/providers/deepinfra.ts
@@ -67,7 +67,7 @@ export const model: ProviderPackage.Definition<Settings, OpenAIProviderOptionsIn
   configure({
     apiKey,
     baseURL,
-    headers: headers === undefined ? undefined : { ...headers },
-    http: body === undefined ? undefined : { body: { ...body } },
+    headers,
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).model(modelID)
diff --git a/packages/ai/src/providers/deepseek.ts b/packages/ai/src/providers/deepseek.ts
index e10296db0344..e4fcf473ce35 100644
--- a/packages/ai/src/providers/deepseek.ts
+++ b/packages/ai/src/providers/deepseek.ts
@@ -59,8 +59,8 @@ export const model: ProviderPackage.Definition<Settings, OpenAIProviderOptionsIn
   configure({
     apiKey,
     baseURL,
-    headers: headers === undefined ? undefined : { ...headers },
-    http: body === undefined ? undefined : { body: { ...body } },
+    headers,
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).model(modelID)
 
diff --git a/packages/ai/src/providers/fireworks.ts b/packages/ai/src/providers/fireworks.ts
index 68e4d98c17a9..df1d741a2d89 100644
--- a/packages/ai/src/providers/fireworks.ts
+++ b/packages/ai/src/providers/fireworks.ts
@@ -56,8 +56,8 @@ export const model: ProviderPackage.Definition<Settings, OpenAIProviderOptionsIn
   configure({
     apiKey,
     baseURL,
-    headers: headers === undefined ? undefined : { ...headers },
-    http: body === undefined ? undefined : { body: { ...body } },
+    headers,
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).model(modelID)
 
diff --git a/packages/ai/src/providers/google-vertex-chat.ts b/packages/ai/src/providers/google-vertex-chat.ts
index e36a170122d7..8a44ed6c8cb7 100644
--- a/packages/ai/src/providers/google-vertex-chat.ts
+++ b/packages/ai/src/providers/google-vertex-chat.ts
@@ -83,8 +83,8 @@ export const model: ProviderPackage.Definition<Settings, OpenAIProviderOptionsIn
   return configure({
     accessToken,
     baseURL,
-    headers: headers === undefined ? undefined : { ...headers },
-    http: body === undefined ? undefined : { body: { ...body } },
+    headers,
+    http: body === undefined ? undefined : { body },
     location,
     project,
     providerOptions,
diff --git a/packages/ai/src/providers/google-vertex-messages.ts b/packages/ai/src/providers/google-vertex-messages.ts
index a07d58b36c62..7e078a118007 100644
--- a/packages/ai/src/providers/google-vertex-messages.ts
+++ b/packages/ai/src/providers/google-vertex-messages.ts
@@ -113,8 +113,8 @@ export const model: ProviderPackage.Definition<Settings, AnthropicMessages.Provi
   return configure({
     accessToken,
     baseURL,
-    headers: headers === undefined ? undefined : { ...headers },
-    http: body === undefined ? undefined : { body: { ...body } },
+    headers,
+    http: body === undefined ? undefined : { body },
     location,
     project,
     providerOptions,
diff --git a/packages/ai/src/providers/google-vertex-responses.ts b/packages/ai/src/providers/google-vertex-responses.ts
index cb8eecee3950..6fb69c7651e7 100644
--- a/packages/ai/src/providers/google-vertex-responses.ts
+++ b/packages/ai/src/providers/google-vertex-responses.ts
@@ -84,8 +84,8 @@ export const model: ProviderPackage.Definition<Settings, OpenResponsesProviderOp
   return configure({
     accessToken,
     baseURL,
-    headers: headers === undefined ? undefined : { ...headers },
-    http: body === undefined ? undefined : { body: { ...body } },
+    headers,
+    http: body === undefined ? undefined : { body },
     location,
     project,
     providerOptions,
diff --git a/packages/ai/src/providers/google-vertex.ts b/packages/ai/src/providers/google-vertex.ts
index 9f8b25ea4ec2..4f5ad1ceee20 100644
--- a/packages/ai/src/providers/google-vertex.ts
+++ b/packages/ai/src/providers/google-vertex.ts
@@ -130,8 +130,8 @@ export const model: ProviderPackage.Definition<Settings, GeminiProviderOptionsIn
   return configure({
     ...(apiKey === undefined ? { accessToken: accessToken } : { apiKey: apiKey }),
     baseURL,
-    headers: headers === undefined ? undefined : { ...headers },
-    http: body === undefined ? undefined : { body: { ...body } },
+    headers,
+    http: body === undefined ? undefined : { body },
     location,
     project,
     providerOptions,
diff --git a/packages/ai/src/providers/google.ts b/packages/ai/src/providers/google.ts
index 579ba690e7b8..4ba61cc6bde4 100644
--- a/packages/ai/src/providers/google.ts
+++ b/packages/ai/src/providers/google.ts
@@ -76,8 +76,8 @@ export const model: ProviderPackage.Definition<Settings, Gemini.ProviderOptionsI
   configure({
     apiKey,
     baseURL,
-    headers: headers === undefined ? undefined : { ...headers },
-    http: body === undefined ? undefined : { body: { ...body } },
+    headers,
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).model(modelID)
 
diff --git a/packages/ai/src/providers/google/interactions.ts b/packages/ai/src/providers/google/interactions.ts
index df47a5dfe131..679ffa4752c3 100644
--- a/packages/ai/src/providers/google/interactions.ts
+++ b/packages/ai/src/providers/google/interactions.ts
@@ -15,7 +15,7 @@ export const model: ProviderPackage.Definition<Settings, GoogleInteractions.Prov
   configure({
     apiKey,
     baseURL,
-    headers: headers === undefined ? undefined : { ...headers },
-    http: body === undefined ? undefined : { body: { ...body } },
+    headers,
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).interactions(modelID)
diff --git a/packages/ai/src/providers/groq.ts b/packages/ai/src/providers/groq.ts
index f30a3f5793de..b3be93455290 100644
--- a/packages/ai/src/providers/groq.ts
+++ b/packages/ai/src/providers/groq.ts
@@ -110,8 +110,8 @@ export const model: ProviderPackage.Definition<Settings, ProviderOptions>["model
   configure({
     apiKey,
     baseURL,
-    headers: headers === undefined ? undefined : { ...headers },
-    http: body === undefined ? undefined : { body: { ...body } },
+    headers,
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).model(modelID)
 
diff --git a/packages/ai/src/providers/meta.ts b/packages/ai/src/providers/meta.ts
index 21a340710dcd..461e84e1854e 100644
--- a/packages/ai/src/providers/meta.ts
+++ b/packages/ai/src/providers/meta.ts
@@ -169,7 +169,7 @@ function fromSettings({ apiKey, baseURL, body, headers, ...providerOptions }: Se
     apiKey,
     baseURL,
     headers,
-    http: body === undefined ? undefined : { body: { ...body } },
+    http: body === undefined ? undefined : { body },
     providerOptions,
   })
 }
diff --git a/packages/ai/src/providers/minimax.ts b/packages/ai/src/providers/minimax.ts
index 80196b3f1fb3..99feb3cad451 100644
--- a/packages/ai/src/providers/minimax.ts
+++ b/packages/ai/src/providers/minimax.ts
@@ -133,7 +133,7 @@ export const model: ProviderPackage.Definition<Settings<MessagesOptionsInput>, M
     apiKey,
     baseURL,
     headers,
-    http: body === undefined ? undefined : { body: { ...body } },
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).model(modelID)
 
diff --git a/packages/ai/src/providers/minimax/chat.ts b/packages/ai/src/providers/minimax/chat.ts
index 3a337089ce39..49ad52e1e4f0 100644
--- a/packages/ai/src/providers/minimax/chat.ts
+++ b/packages/ai/src/providers/minimax/chat.ts
@@ -11,6 +11,6 @@ export const model: ProviderPackage.Definition<Settings, MiniMax.ChatOptionsInpu
     apiKey,
     baseURL,
     headers,
-    http: body === undefined ? undefined : { body: { ...body } },
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).chat(modelID)
diff --git a/packages/ai/src/providers/minimax/responses.ts b/packages/ai/src/providers/minimax/responses.ts
index df5fbea99f71..855e6b0971cd 100644
--- a/packages/ai/src/providers/minimax/responses.ts
+++ b/packages/ai/src/providers/minimax/responses.ts
@@ -11,6 +11,6 @@ export const model: ProviderPackage.Definition<Settings, MiniMax.ResponsesOption
     apiKey,
     baseURL,
     headers,
-    http: body === undefined ? undefined : { body: { ...body } },
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).responses(modelID)
diff --git a/packages/ai/src/providers/mistral.ts b/packages/ai/src/providers/mistral.ts
index e916024df658..f080aded3625 100644
--- a/packages/ai/src/providers/mistral.ts
+++ b/packages/ai/src/providers/mistral.ts
@@ -46,8 +46,8 @@ export const model: ProviderPackage.Definition<Settings, ProviderOptions>["model
   configure({
     apiKey,
     baseURL,
-    headers: headers === undefined ? undefined : { ...headers },
-    http: body === undefined ? undefined : { body: { ...body } },
+    headers,
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).model(modelID)
 
diff --git a/packages/ai/src/providers/moonshot.ts b/packages/ai/src/providers/moonshot.ts
index edaaf4e97b37..8bac1ea550b7 100644
--- a/packages/ai/src/providers/moonshot.ts
+++ b/packages/ai/src/providers/moonshot.ts
@@ -142,7 +142,7 @@ export const model: ProviderPackage.Definition<Settings, ChatOptionsInput>["mode
     apiKey,
     baseURL,
     headers,
-    http: body === undefined ? undefined : { body: { ...body } },
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).model(modelID)
 
diff --git a/packages/ai/src/providers/moonshot/messages.ts b/packages/ai/src/providers/moonshot/messages.ts
index aac4484e8768..61cce0428fd5 100644
--- a/packages/ai/src/providers/moonshot/messages.ts
+++ b/packages/ai/src/providers/moonshot/messages.ts
@@ -11,6 +11,6 @@ export const model: ProviderPackage.Definition<Settings, Moonshot.MessagesOption
     apiKey,
     baseURL,
     headers,
-    http: body === undefined ? undefined : { body: { ...body } },
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).messages(modelID)
diff --git a/packages/ai/src/providers/moonshot/responses.ts b/packages/ai/src/providers/moonshot/responses.ts
index f1f9e4e24500..cb784f597199 100644
--- a/packages/ai/src/providers/moonshot/responses.ts
+++ b/packages/ai/src/providers/moonshot/responses.ts
@@ -11,6 +11,6 @@ export const model: ProviderPackage.Definition<Settings, Moonshot.ResponsesOptio
     apiKey,
     baseURL,
     headers,
-    http: body === undefined ? undefined : { body: { ...body } },
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).responses(modelID)
diff --git a/packages/ai/src/providers/openai-compatible-responses.ts b/packages/ai/src/providers/openai-compatible-responses.ts
index 41f59fb91e5b..fc7216cda44c 100644
--- a/packages/ai/src/providers/openai-compatible-responses.ts
+++ b/packages/ai/src/providers/openai-compatible-responses.ts
@@ -53,8 +53,8 @@ export const model: ProviderPackage.Definition<Settings, OpenResponsesProviderOp
   configure({
     apiKey,
     baseURL,
-    headers: headers === undefined ? undefined : { ...headers },
-    http: body === undefined ? undefined : { body: { ...body } },
+    headers,
+    http: body === undefined ? undefined : { body },
     provider,
     providerOptions,
   }).model(modelID)
diff --git a/packages/ai/src/providers/openai-compatible.ts b/packages/ai/src/providers/openai-compatible.ts
index 8ba5c37a6e35..7be2101376c5 100644
--- a/packages/ai/src/providers/openai-compatible.ts
+++ b/packages/ai/src/providers/openai-compatible.ts
@@ -52,8 +52,8 @@ export const model: ProviderPackage.Definition<Settings, OpenAIProviderOptionsIn
   configure({
     apiKey,
     baseURL,
-    headers: headers === undefined ? undefined : { ...headers },
-    http: body === undefined ? undefined : { body: { ...body } },
+    headers,
+    http: body === undefined ? undefined : { body },
     provider,
     providerOptions,
   }).model(modelID)
diff --git a/packages/ai/src/providers/openai.ts b/packages/ai/src/providers/openai.ts
index 8dee9fe6ac29..2e9138bc2e6b 100644
--- a/packages/ai/src/providers/openai.ts
+++ b/packages/ai/src/providers/openai.ts
@@ -152,7 +152,7 @@ const config = ({
     apiKey,
     baseURL,
     headers: Object.keys(headers).length === 0 ? undefined : headers,
-    http: body === undefined ? undefined : { body: { ...body } },
+    http: body === undefined ? undefined : { body },
     providerOptions,
     queryParams: queryParams === undefined ? undefined : { ...queryParams },
   }
diff --git a/packages/ai/src/providers/openrouter.ts b/packages/ai/src/providers/openrouter.ts
index 1cd094845eb9..b4139cf26d7b 100644
--- a/packages/ai/src/providers/openrouter.ts
+++ b/packages/ai/src/providers/openrouter.ts
@@ -212,6 +212,6 @@ export const model: ProviderPackage.Definition<Settings, OpenRouterProviderOptio
     apiKey,
     baseURL,
     headers,
-    http: body === undefined ? undefined : { body: { ...body } },
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).model(modelID)
diff --git a/packages/ai/src/providers/togetherai.ts b/packages/ai/src/providers/togetherai.ts
index 2d01480b7cb2..e6e9e83f8cc9 100644
--- a/packages/ai/src/providers/togetherai.ts
+++ b/packages/ai/src/providers/togetherai.ts
@@ -59,7 +59,7 @@ export const model: ProviderPackage.Definition<Settings, OpenAIProviderOptionsIn
   configure({
     apiKey,
     baseURL,
-    headers: headers === undefined ? undefined : { ...headers },
-    http: body === undefined ? undefined : { body: { ...body } },
+    headers,
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).model(modelID)
diff --git a/packages/ai/src/providers/venice.ts b/packages/ai/src/providers/venice.ts
index 6a796572aaea..e4a3510603cd 100644
--- a/packages/ai/src/providers/venice.ts
+++ b/packages/ai/src/providers/venice.ts
@@ -55,7 +55,7 @@ export const model: ProviderPackage.Definition<Settings, ChatOptionsInput>["mode
     baseURL,
     queryParams,
     headers,
-    http: body === undefined ? undefined : { body: { ...body } },
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).model(modelID)
 
diff --git a/packages/ai/src/providers/vercel-ai-gateway.ts b/packages/ai/src/providers/vercel-ai-gateway.ts
index fc0f2e171acc..713acdd8606e 100644
--- a/packages/ai/src/providers/vercel-ai-gateway.ts
+++ b/packages/ai/src/providers/vercel-ai-gateway.ts
@@ -374,7 +374,7 @@ function fromSettings({ apiKey, baseURL, headers, body, ...providerOptions }: Se
     apiKey,
     baseURL,
     headers,
-    http: body === undefined ? undefined : { body: { ...body } },
+    http: body === undefined ? undefined : { body },
     providerOptions,
   })
 }
diff --git a/packages/ai/src/providers/xai.ts b/packages/ai/src/providers/xai.ts
index 879d2ca0beec..1dadacc615eb 100644
--- a/packages/ai/src/providers/xai.ts
+++ b/packages/ai/src/providers/xai.ts
@@ -112,7 +112,7 @@ export const model: ProviderPackage.Definition<
     apiKey,
     baseURL,
     headers,
-    http: body === undefined ? undefined : { body: { ...body } },
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).model(modelID)
 export const responses = provider.responses
diff --git a/packages/ai/src/providers/zai-coding-plan.ts b/packages/ai/src/providers/zai-coding-plan.ts
index 6f82fbe05d67..c1888912e0ea 100644
--- a/packages/ai/src/providers/zai-coding-plan.ts
+++ b/packages/ai/src/providers/zai-coding-plan.ts
@@ -88,7 +88,7 @@ export const model: ProviderPackage.Definition<Settings, ChatOptionsInput>["mode
     apiKey,
     baseURL,
     headers,
-    http: body === undefined ? undefined : { body: { ...body } },
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).model(modelID)
 
diff --git a/packages/ai/src/providers/zai-coding-plan/messages.ts b/packages/ai/src/providers/zai-coding-plan/messages.ts
index 21093d6781aa..290e8fb2ebf6 100644
--- a/packages/ai/src/providers/zai-coding-plan/messages.ts
+++ b/packages/ai/src/providers/zai-coding-plan/messages.ts
@@ -11,6 +11,6 @@ export const model: ProviderPackage.Definition<Settings, ZAICodingPlan.MessagesO
     apiKey,
     baseURL,
     headers,
-    http: body === undefined ? undefined : { body: { ...body } },
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).messages(modelID)
diff --git a/packages/ai/src/providers/zai-coding-plan/responses.ts b/packages/ai/src/providers/zai-coding-plan/responses.ts
index 15fb6cf75c93..616584ca7a25 100644
--- a/packages/ai/src/providers/zai-coding-plan/responses.ts
+++ b/packages/ai/src/providers/zai-coding-plan/responses.ts
@@ -11,6 +11,6 @@ export const model: ProviderPackage.Definition<Settings, ZAICodingPlan.Responses
     apiKey,
     baseURL,
     headers,
-    http: body === undefined ? undefined : { body: { ...body } },
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).responses(modelID)
diff --git a/packages/ai/src/providers/zai.ts b/packages/ai/src/providers/zai.ts
index c878a9925d60..760c4a3e2cae 100644
--- a/packages/ai/src/providers/zai.ts
+++ b/packages/ai/src/providers/zai.ts
@@ -73,7 +73,7 @@ export const model: ProviderPackage.Definition<Settings, ChatOptionsInput>["mode
     apiKey,
     baseURL,
     headers,
-    http: body === undefined ? undefined : { body: { ...body } },
+    http: body === undefined ? undefined : { body },
     providerOptions,
   }).model(modelID)