Grok 4.1 Fast reasoning

openrouter
xai
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

Capabilities

Context Window 2M tokens
Max Output 30k tokens
Inputs
Outputs

Pricing (per 1M tokens)

Input $0.20
Output $0.50
Cache Read $0.05
Cache Write -

Supported Parameters

include_reasoninglogprobsmax_tokensreasoningresponse_formatseedstructured_outputstemperaturetool_choicetoolstop_logprobstop_p

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