Back to Leaderboard

xAI: Grok 4.1 Fast

New in 2026

Developed by x-ai

API Pricing (per 1M tokens)

Input$0.20
Output$0.50

Intelligence Benchmarks

MMLU ProN/A
GPQAN/A
Intelligence IndexN/A
LivebenchN/A

Technical Specifications

Context Window2000K Tokens
Vision SupportYes
Tokens per Second118
Time to First Token (s)0.79
Modalities
textimage->text

About 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)