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Grok 4 Fast is xAI's latest multimodal model with SOTA cost-efficiency and a 2M token context window. It comes in two flavors: non-reasoning and reasoning. Read more about the model on xAI's [news post](http://x.ai/news/grok-4-fast). 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
23.1
161st of 442
Top 37%
Coding Index
19.0
154th of 352
Top 44%
Math Index
41.3
151st of 268
Top 58%
Price/1M
$0.28
324th cheapest
11% below median
Top 48%
Speed
105 tok/s
Top 26%
TTFT
0.28s
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 52% of models. Median price is $0.31/1M tokens.
Daily
$0.28
Monthly
$8.25
105
tokens/sec
Faster than 74% of models
0.28
seconds
Faster than 59% of models
0.28
seconds
Faster than 60% of models
Market Median
46 tok/s
130% faster
Median TTFT
0.42s
32% faster
Throughput/Dollar
381
tok/s per $/1M
Speed Comparison
Context Window
2.0M
tokens
Larger than 99% of models
Max Output
30K
tokens
2% of context