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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)
Quality Index
23.6
156th of 444
Top 35%
Coding Index
19.5
150th of 354
Top 43%
Math Index
34.3
175th of 268
Top 66%
Price/1M
$0.28
330th cheapest
8% below median
Top 49%
Speed
118 tok/s
Top 23%
TTFT
0.33s
Context Window
2.0M
1st largest
Top 1%
Input
$0.20
per 1M tokens
Output
$0.50
per 1M tokens
Blended
$0.28
per 1M tokens
Cheaper than 51% of models. Median price is $0.30/1M tokens.
Daily
$0.28
Monthly
$8.25
118
tokens/sec
Faster than 77% of models
0.33
seconds
Faster than 57% of models
0.33
seconds
Faster than 58% of models
Market Median
45 tok/s
160% faster
Median TTFT
0.42s
22% faster
Throughput/Dollar
429
tok/s per $/1M
Speed Comparison
Context Window
2.0M
tokens
Larger than 99% of models
Max Output
30K
tokens
2% of context