Grok 4.1 Fast
xAILanguage modeling/generationQuestion answeringMathematical reasoningQuantitative reasoningCode generation
Grok 4.1 Fast is a language modeling/generation model from xAI released in 2025.
About Grok 4.1 Fast
Today, we’re excited to launch two powerful new additions to the xAI API:
Grok 4.1 Fast, our best tool-calling model with a 2M context window. It reasons and completes agentic tasks accurately and rapidly, excelling at complex real-world use cases s
LLM pricing & performance
Full LLM page →Grok 4.1 Fast is available via API — live cost, context, and benchmark data:
Input / 1M
$0.20
Output / 1M
$0.50
Context
2M
Tokens/sec
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Details
- Provider
- xAI
- Task
- Language modeling/generation,Question answering,Mathematical reasoning,Quantitative reasoning,Code generation
- Released
- 2025-11-19
- Open weights
- No