fix(provider): preserve Alibaba DeepSeek effort

packages/opencode/src/provider/provider.ts

@@ -1686,7 +1686,13 @@ const layer = Layer.effect(
           delete options.fetch
         }
 
-        if (model.api.npm.includes("@ai-sdk/openai-compatible") && options["includeUsage"] !== false) {
+        // Alibaba's SDK does not expose DeepSeek V4's native reasoning_effort field.
+        const npm =
+          model.api.npm === "@ai-sdk/alibaba" && ["deepseek-v4-pro", "deepseek-v4-flash"].includes(model.api.id)
+            ? "@ai-sdk/openai-compatible"
+            : model.api.npm
+
+        if (npm.includes("@ai-sdk/openai-compatible") && options["includeUsage"] !== false) {
           options["includeUsage"] = true
         }
 
@@ -1722,7 +1728,7 @@ const layer = Layer.effect(
         const key = Hash.fast(
           JSON.stringify({
             providerID: model.providerID,
-            npm: model.api.npm,
+            npm,
             options,
           }),
         )
@@ -1762,7 +1768,7 @@ const layer = Layer.effect(
           return wrapSSE(res, chunkTimeout, chunkAbortCtl)
         }
 
-        const bundledLoader = BUNDLED_PROVIDERS[model.api.npm]
+        const bundledLoader = BUNDLED_PROVIDERS[npm]
         if (bundledLoader) {
           const factory = await bundledLoader()
           const loaded = factory({
@@ -1774,11 +1780,11 @@ const layer = Layer.effect(
         }
 
         const installedPath = await (async () => {
-          if (model.api.npm.startsWith("file://")) {
-            return model.api.npm
+          if (npm.startsWith("file://")) {
+            return npm
           }
-          const item = await Npm.add(model.api.npm)
-          if (!item.entrypoint) throw new Error(`Package ${model.api.npm} has no import entrypoint`)
+          const item = await Npm.add(npm)
+          if (!item.entrypoint) throw new Error(`Package ${npm} has no import entrypoint`)
           return item.entrypoint
         })()
 

packages/opencode/src/provider/transform.ts

@@ -1744,9 +1744,11 @@ function reasoningEffort(model: Provider.Model, effort: string) {
     case "@ai-sdk/cohere":
     case "@ai-sdk/perplexity":
     case "@ai-sdk/vercel":
-    case "@ai-sdk/alibaba":
     case "gitlab-ai-provider":
       return
+    case "@ai-sdk/alibaba":
+      if (["deepseek-v4-pro", "deepseek-v4-flash"].includes(model.api.id)) return { reasoningEffort: effort }
+      return
   }
 }
 

packages/opencode/test/provider/transform.test.ts

@@ -3289,6 +3289,18 @@ describe("ProviderTransform.reasoningVariants", () => {
     ).toEqual({ max: { effort: "max" } })
   })
 
+  test.each(["deepseek-v4-pro", "deepseek-v4-flash"])("preserves Alibaba %s reasoning effort", (id) => {
+    expect(
+      ProviderTransform.reasoningVariants(
+        model([{ type: "effort", values: ["high", "max"] }]),
+        target("@ai-sdk/alibaba", id),
+      ),
+    ).toEqual({
+      high: { reasoningEffort: "high" },
+      max: { reasoningEffort: "max" },
+    })
+  })
+
   test("maps Kimi effort metadata to adaptive thinking", () => {
     expect(
       ProviderTransform.reasoningVariants(

packages/opencode/test/session/llm.test.ts

@@ -832,6 +832,66 @@ describe("session.llm.stream", () => {
     },
   )
 
+  it.instance(
+    "preserves DeepSeek V4 effort and caching with the Alibaba SDK",
+    () =>
+      Effect.gen(function* () {
+        const request = waitRequest(
+          "/chat/completions",
+          new Response(createChatStream("Hello"), {
+            status: 200,
+            headers: { "Content-Type": "text/event-stream" },
+          }),
+        )
+        const source = yield* Provider.use.getModel(ProviderV2.ID.make("alibaba"), ModelV2.ID.make("qwen-plus"))
+        const resolved = {
+          ...source,
+          id: ModelV2.ID.make("deepseek-v4-pro"),
+          api: { ...source.api, id: "deepseek-v4-pro", npm: "@ai-sdk/alibaba" },
+          variants: { high: { reasoningEffort: "high" } },
+        }
+        const sessionID = SessionID.make("session-test-alibaba-deepseek-effort")
+        const agent = {
+          name: "test",
+          mode: "primary",
+          options: {},
+          permission: [{ permission: "*", pattern: "*", action: "allow" }],
+        } satisfies Agent.Info
+        const user = {
+          id: MessageID.make("msg_user-alibaba-deepseek-effort"),
+          sessionID,
+          role: "user",
+          time: { created: Date.now() },
+          agent: agent.name,
+          model: { providerID: resolved.providerID, modelID: resolved.id, variant: "high" },
+        } satisfies SessionV1.User
+
+        yield* drain({
+          user,
+          sessionID,
+          model: resolved,
+          agent,
+          system: ["You are a helpful assistant."],
+          messages: [{ role: "user", content: "Hello" }],
+          tools: {},
+        })
+
+        const capture = yield* Effect.promise(() => request)
+        expect(capture.body.reasoning_effort).toBe("high")
+        expect(JSON.stringify(capture.body.messages)).toContain('"cache_control":{"type":"ephemeral"}')
+      }),
+    {
+      config: () => ({
+        enabled_providers: ["alibaba"],
+        provider: {
+          alibaba: {
+            options: { apiKey: "test-key", baseURL: `${state.server!.url.origin}/v1` },
+          },
+        },
+      }),
+    },
+  )
+
   const cerebrasFixture = { providerID: "cerebras", modelID: "gpt-oss-120b" }
   it.instance(
     "replays Cerebras assistant reasoning using the provider-supported field",