diff --git a/packages/ai/src/providers/groq.ts b/packages/ai/src/providers/groq.ts
index 4ece7cf6eeb..e9048262b74 100644
--- a/packages/ai/src/providers/groq.ts
+++ b/packages/ai/src/providers/groq.ts
@@ -34,8 +34,6 @@ export type Settings = ProviderPackage.Settings &
 
 const Options = Schema.Struct({
   includeReasoning: Schema.optional(Schema.Boolean),
-  parallelToolCalls: Schema.optional(Schema.Boolean),
-  serviceTier: Schema.optional(Schema.String),
   user: Schema.optional(Schema.String),
 })
 
@@ -46,8 +44,6 @@ export const protocol = Protocol.make({
       ...OpenAIChat.bodyFields,
       reasoning_format: Schema.optional(Schema.Literal("parsed")),
       include_reasoning: Schema.optional(Schema.Boolean),
-      parallel_tool_calls: Schema.optional(Schema.Boolean),
-      service_tier: Schema.optional(Schema.String),
       user: Schema.optional(Schema.String),
     }),
     from: Effect.fn("Groq.fromRequest")(function* (request: LLMRequest) {
@@ -59,8 +55,6 @@ export const protocol = Protocol.make({
         ...(yield* OpenAIChat.fromRequest(request)),
         reasoning_format: gptOSS ? undefined : ("parsed" as const),
         include_reasoning: gptOSS ? options.includeReasoning : undefined,
-        parallel_tool_calls: options.parallelToolCalls,
-        service_tier: options.serviceTier,
         user: options.user,
       }
     }),
diff --git a/packages/ai/test/provider/groq.test.ts b/packages/ai/test/provider/groq.test.ts
index aca18d2180c..eac3b09d903 100644
--- a/packages/ai/test/provider/groq.test.ts
+++ b/packages/ai/test/provider/groq.test.ts
@@ -42,7 +42,12 @@ it.effect("Groq lowers its own options for custom catalog identities and endpoin
       { provider: "custom-groq" },
     )
     const compiled = yield* compileRequest(
-      LLM.request({ model, prompt: "Hello", providerOptions: { parallelToolCalls: false, includeReasoning: false } }),
+      LLM.request({
+        model,
+        prompt: "Hello",
+        tools: [weatherTool],
+        providerOptions: { parallelToolCalls: false, includeReasoning: false },
+      }),
     )
     expect(model.route.endpoint.baseURL).toBe("https://gateway.example/v1")
     expect(model.route.defaults.headers).toEqual({ "x-client": "test" })
@@ -60,6 +65,25 @@ it.effect("Groq lowers its own options for custom catalog identities and endpoin
   }),
 )
 
+it.effect("Groq honors disableParallelToolUse and sends parallel_tool_calls only with tools", () =>
+  Effect.gen(function* () {
+    const model = Groq.configure({ apiKey: "fixture" }).model("openai/gpt-oss-20b")
+    const withTools = yield* compileRequest(
+      LLM.request({
+        model,
+        prompt: "Hello",
+        tools: [weatherTool],
+        toolChoice: { type: "auto", disableParallelToolUse: true },
+      }),
+    )
+    expect(withTools.body.parallel_tool_calls).toBe(false)
+    const withoutTools = yield* compileRequest(
+      LLM.request({ model, prompt: "Hello", providerOptions: { parallelToolCalls: true } }),
+    )
+    expect(withoutTools.body).not.toHaveProperty("parallel_tool_calls")
+  }),
+)
+
 it.effect("Groq replays reasoning only when present and preserves explicit reasoning exclusion", () =>
   Effect.gen(function* () {
     const compiled = yield* compileRequest(
@@ -100,11 +124,13 @@ it.effect("Groq omits reasoning_format for the GPT-OSS family by default", () =>
 
 it.effect("Groq validates option types", () =>
   Effect.gen(function* () {
-    for (const providerOptions of [{ includeReasoning: "false" }, { parallelToolCalls: "false" }]) {
-      const error = yield* compileRequest(
-        LLM.request({ model: Groq.configure({ apiKey: "fixture" }).model("qwen"), prompt: "Hello", providerOptions }),
-      ).pipe(Effect.flip)
-      expect(error.reason._tag).toBe("InvalidRequest")
-    }
+    const error = yield* compileRequest(
+      LLM.request({
+        model: Groq.configure({ apiKey: "fixture" }).model("qwen"),
+        prompt: "Hello",
+        providerOptions: { includeReasoning: "false" },
+      }),
+    ).pipe(Effect.flip)
+    expect(error.reason._tag).toBe("InvalidRequest")
   }),
 )