Gemini 3 models hang due to conflicting thinkingConfig in smallOptions()

[kevoconnell]

Description

When using gemini-3-pro-preview via the SDK, requests hang indefinitely. The same code works fine with gemini-2.0-flash.

Root cause: In packages/opencode/src/provider/transform.ts, smallOptions() returns { thinkingConfig: { thinkingBudget: 0 } } for all Google models (line 477-478). But options() sets { thinkingConfig: { thinkingLevel: "high" } } for gemini-3 models. When merged, Gemini 3 receives both parameters, which the API rejects.

Suggested fix:

if (model.providerID === "google") {
  if (model.api.id.includes("gemini-3")) {
    return { thinkingConfig: { thinkingLevel: "low" } }
  }
  return { thinkingConfig: { thinkingBudget: 0 } }
}

Plugins

None (using the sdk)

OpenCode version

1.0.223

Steps to reproduce

1. Use createOpencode() from @opencode-ai/sdk
2. Configure model as gemini-3-pro-preview
3. Send a prompt
4. Request hangs indefinitely

Operating System

macOS

Terminal

N/A (using the sdk)