x-ai
xAI: 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)
Input Cost
$0.20
per 1M tokens
Output Cost
$0.50
per 1M tokens
Context Window
2,000,000
tokens
Developer ID: x-ai/grok-4.1-fast
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