Grok 4.1 Fast
xAIProprietaryNon-reasoningProvisionalReleased Nov 19, 2025
Overall score
36.4
Rank 155 of 222 · 26.7–46.2
Context window
1M
1,000,000 tokens
Price per 1M tokens
$0.20 in · $0.50 out
Source: BenchLM
Blended price
$0.28
3:1 input:output tokens
Output speed
—
Not measured yet
Category scores
Scores per capability area with the model's rank among ranked models in that category.
- 1Reasoning46.5
- 2Instruction following#11441.9
- 3Knowledge39.2
- 4Multimodal35.9
Benchmark results (1)
As reported in system cards, papers and public evaluations. Position compares this model with every other model reporting the same benchmark.
Agentic & tool use
| Gert Labs | 47.32 | #25 of 52 |
Pricing by source
USD per 1M tokens.
| Source | Input | Output | Cached in |
|---|---|---|---|
| List price (BenchLM) | $0.20 | $0.50 | — |
Last published rate. xAI's public API pricing pages listed grok-4-1-fast at $0.20 input / $0.50 output per million tokens. The pricing and models pages, read September 25, 2026, no longer list it, and its model page redirects to the models overview.
Arena ratings
Human-preference ratings from LMArena. Best-rated variant shown.
| WebDev (coding)(Reasoning) | 1242 | #138 · 5.5K votes |
| Vision(Reasoning) | 1201 | #94 · 13.4K votes |
Speed
Measured by us through OpenRouter (median of trials).
Not available on OpenRouter, so we cannot measure it yet.
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