Grok 4.1 Fast
Grok 4.1 Fast is xAI's best agentic tool calling model that shines in real-world use cases like customer support and deep research. 2M context window. Reasoning can be enabled/disabled using the `reasoning` `enabled` parameter in the API. [Learn more in our docs](https://openrouter.ai/docs/use-cases/reasoning-tokens#controlling-reasoning-tokens)
The date this AI finished learning. It may not know about things that happened after this date.
The types of content this AI can receive, and what it can produce in return.
The maximum amount of text the AI can read and process in a single request. A larger number means it can handle longer documents or conversations.
The cost of using this AI directly in your own application. Shown in USD per 1 million units of text (tokens).