xAI: Grok 4.1 Fast
Analysis Summary
xAI: Grok 4.1 Fast sits in the Specialist tier on our leaderboard, ranked #111 of 544 published models on overall intelligence. At $0.200 input and $0.500 output per 1M tokens, it is among the most expensive on the market. It offers an exceptionally large context window suited to long-document workflows and supports tool use, function calling, vision, and reasoning.
Editorial notes
xAI Grok 4.1 Fast offers a 2M token context window with vision, tool use, and competitive pricing, but a mid-range intelligence index of 23.6 limits its suitability for complex reasoning or coding tasks.
Assessed May 5, 2026
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
Performance Profile
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..
Capabilities
Performance Indices
Source: Artificial Analysis
Benchmark Scores
Intelligence
Technical
Content
Benchmark data from Artificial Analysis and Hugging Face
How does xAI: Grok 4.1 Fast stack up?
Compare side-by-side with other specialist models.
Model Information
| OpenRouter ID |
x-ai/grok-4.1-fast
|
| Provider | x-ai |
| Release Date | November 19, 2025 |
| Context Length | 2,000,000 tokens |
| Max Completion | 30,000 tokens |
| Status | Active |
Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $0.20 | $0.000200 |
| Output | $0.50 | $0.000500 |
Live Performance
Live endpoint metrics — refreshed every 30 minutes.
