diff --git a/packages/llm/src/protocols/gemini.ts b/packages/llm/src/protocols/gemini.ts
index c8fa34b50965..53dd84ae8d39 100644
--- a/packages/llm/src/protocols/gemini.ts
+++ b/packages/llm/src/protocols/gemini.ts
@@ -99,6 +99,9 @@ const GeminiGenerationConfig = Schema.Struct({
   temperature: Schema.optional(Schema.Number),
   topP: Schema.optional(Schema.Number),
   topK: Schema.optional(Schema.Number),
+  frequencyPenalty: Schema.optional(Schema.Number),
+  presencePenalty: Schema.optional(Schema.Number),
+  seed: Schema.optional(Schema.Number),
   stopSequences: optionalArray(Schema.String),
   thinkingConfig: Schema.optional(GeminiThinkingConfig),
 })
@@ -305,6 +308,9 @@ const fromRequest = Effect.fn("Gemini.fromRequest")(function* (request: LLMReque
     temperature: generation?.temperature,
     topP: generation?.topP,
     topK: generation?.topK,
+    frequencyPenalty: generation?.frequencyPenalty,
+    presencePenalty: generation?.presencePenalty,
+    seed: generation?.seed,
     stopSequences: generation?.stop,
     thinkingConfig: thinkingConfig(request),
   }
diff --git a/packages/llm/test/provider/gemini.test.ts b/packages/llm/test/provider/gemini.test.ts
index d30742c47d35..a7e52c503cab 100644
--- a/packages/llm/test/provider/gemini.test.ts
+++ b/packages/llm/test/provider/gemini.test.ts
@@ -36,6 +36,24 @@ describe("Gemini route", () => {
     }),
   )
 
+  it.effect("forwards frequencyPenalty, presencePenalty, and seed to generationConfig", () =>
+    Effect.gen(function* () {
+      const prepared = yield* LLMClient.prepare<Gemini.GeminiBody>(
+        LLM.request({
+          model,
+          prompt: "Say hello.",
+          generation: { frequencyPenalty: 0.5, presencePenalty: 0.25, seed: 7 },
+        }),
+      )
+
+      expect(prepared.body.generationConfig).toMatchObject({
+        frequencyPenalty: 0.5,
+        presencePenalty: 0.25,
+        seed: 7,
+      })
+    }),
+  )
+
   it.effect("lowers chronological system updates to wrapped user text in order", () =>
     Effect.gen(function* () {
       const prepared = yield* LLMClient.prepare<Gemini.GeminiBody>(