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fix: improve Gemini caching through OpenRouter#36070

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fix: improve Gemini caching through OpenRouter #36070

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2 changes: 2 additions & 0 deletions packages/opencode/src/provider/transform.ts
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Original file line numberDiff line numberDiff line change
Expand Up@@ -433,6 +433,7 @@ export function message(msgs: ModelMessage[], model: Provider.Model, options: Re
if (
(model.providerID === "anthropic" ||
model.providerID === "google-vertex-anthropic" ||
(model.api.npm === "@openrouter/ai-sdk-provider" && model.api.id.includes("gemini")) ||
model.api.id.includes("anthropic") ||
model.api.id.includes("claude") ||
model.id.includes("anthropic") ||
Expand DownExpand Up@@ -1221,6 +1222,7 @@ export function options(input: {

if (input.model.providerID === "openrouter") {
result["prompt_cache_key"] = input.sessionID
result["session_id"] = input.sessionID
}
if (input.model.api.npm === "@ai-sdk/gateway") {
result["gateway"] = {
Expand Down
53 changes: 52 additions & 1 deletion packages/opencode/test/provider/transform.test.ts
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Original file line numberDiff line numberDiff line change
Expand Up@@ -172,6 +172,26 @@ describe("ProviderTransform.options - setCacheKey", () => {
})
expect(result.store).toBe(false)
})

test("should set session affinity for openrouter", () => {
const result = ProviderTransform.options({
model: {
...mockModel,
id: "google/gemini-3.1-pro-preview",
providerID: "openrouter",
api: {
id: "google/gemini-3.1-pro-preview",
url: "https://openrouter.ai/api/v1",
npm: "@openrouter/ai-sdk-provider",
},
},
sessionID,
providerOptions: {},
})

expect(result.prompt_cache_key).toBe(sessionID)
expect(result.session_id).toBe(sessionID)
})
})

describe("ProviderTransform.options - zai/zhipuai thinking", () => {
Expand DownExpand Up@@ -2821,7 +2841,7 @@ describe("ProviderTransform.message - bedrock caching with non-bedrock providerI
})
})

describe("ProviderTransform.message - cache control on gateway", () => {
describe("ProviderTransform.message - cache control", () => {
const createModel = (overrides: Partial<any> = {}) =>
({
id: "anthropic/claude-sonnet-4",
Expand DownExpand Up@@ -2868,6 +2888,37 @@ describe("ProviderTransform.message - cache control on gateway", () => {
expect(result[0].providerOptions).toBeUndefined()
})

test("openrouter gemini applies explicit cache control", () => {
const model = createModel({
id: "google/gemini-3.1-pro-preview",
providerID: "openrouter",
api: {
id: "google/gemini-3.1-pro-preview",
url: "https://openrouter.ai/api/v1",
npm: "@openrouter/ai-sdk-provider",
},
})
const msgs = [
{
role: "system",
content: "You are a helpful assistant",
},
{
role: "user",
content: [{ type: "text", text: "Hello" }],
},
] as any[]

const result = ProviderTransform.message(msgs, model, {}) as any[]

expect(result[0].providerOptions?.openrouter).toEqual({
cacheControl: { type: "ephemeral" },
})
expect(result[1].content[0].providerOptions?.openrouter).toEqual({
cacheControl: { type: "ephemeral" },
})
})

test("non-gateway anthropic keeps existing cache control behavior", () => {
const model = createModel({
providerID: "anthropic",
Expand Down
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