Grok 4.1 Fast
xAI's fast agentic tool-calling model with a 2M context window; non-reasoning variant for low-latency responses
- Strongest at
- Reasoning Better than 41% of the past year's models · one benchmark so far
- Context window
- 2M tokens in · 30K out
- Since the last one
- 61 days after Grok 4 Fast
Capability profile
Scored against 91 models released in the past year. 50 is the average model; further out is better.
No results yet: Coding, Reading & documents, Science, Visual reasoning, Computer use
Where these scores come from
Each capability combines the published benchmarks listed here, rescaled so 50 is the reference average and 15 points is one standard deviation. A hollow dot rests on a single benchmark.
- Writing EQ-Bench Creative Writing v3, EQ-Bench Longform Writing
- Reasoning SimpleBench
- Math ProofBench
Since Grok 4 Fast
3 releases in the Grok line.
Epoch benchmark boards
Best result on each board it has run. The tick marks the leader.
xAI's past year
19 release days in the past year, about one every 19 days. The next is expected around Nov 10, 2026. Forecasts ↗
Specifications
Specifications and prices from Models.dev; availability and limits may differ by provider. Benchmarks from Epoch AI (CC BY 4.0), LiveBench and the other sources named above.