X Ai
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)
- Input / 1M tokens
- $0.200
- Output / 1M tokens
- $0.500
- Context window
- 2M tokens
- Provider
- X Ai
- Cached input / 1M
- $0.050
Performance
Median streaming throughput and first-token latency measured by Artificial Analysis.
- Output tokens / sec
- 140 t/s
- Time to first token
- 0.40s
Benchmarks
Intelligence, coding, and math indexes plus the underlying evaluation scores.
- Intelligence Index
- 24
- Coding Index
- 20
- Math Index
- 34
- MMLU-Pro
- 74.3%
- GPQA
- 63.7%
- HLE
- 5.0%
- LiveCodeBench
- 39.9%
- SciCode
- 29.6%
- MATH-500
- —
- AIME
- —
Benchmarks via Artificial Analysis