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Grok 4.2 Reasoning
xAI's Grok 4.2 Reasoning model is now available via Google Agent Platform MaaS.
The extension adds first-class support for grok-4.2-reasoning through Vertex AI's Model-as-a-Service (MaaS) endpoint. This brings a major private competitor (alongside Google and Anthropic) into the native VS Code Copilot Chat experience with full native reasoning extraction.
Unlike other MaaS models that use chat_template_kwargs or hidden thinking tokens, Grok 4.2 returns reasoning steps in a dedicated reasoning_content field. The VertexMaaSProvider automatically consumes these deltas so the final chat response remains clean while still benefiting from deep chain-of-thought reasoning.
- Complex multi-step reasoning and problem solving
- Creative, direct, and witty responses
- Scenarios where you want an independent perspective from Google or Anthropic models
- High-stakes technical tasks that benefit from transparent thinking traces
No additional configuration is needed beyond your existing Google Cloud project with MaaS permissions. The model will appear in the Copilot Chat model picker once your project has access to the xai/grok-4.20-reasoning endpoint in the Model Garden.
See also:
Note: As a major closed-model competitor, Grok 4.2 Reasoning has been given its own dedicated documentation page rather than being grouped under the open-weight MaaS models.