This model is not part of the weekly automatic sync. The figures below were confirmed on 2026-08-13.
2 million token super long context high-speed inference version
Grok 4.1 Fast — xAI. Context window 2,000,000 tokens. API pricing (per 1M tokens): Input $0.2, Output $0.5. License: Proprietary. LMArena 1,408.
| Provider | xAI |
|---|---|
| Tier | Mid |
| Context window | 2,000,000 tokens |
| Max output | 8,192 tokens |
| License | Proprietary |
| API pricing (per 1M tokens) · Input | $0.2 |
| API pricing (per 1M tokens) · Output | $0.5 |
| LMArena | 1,408 (grok-4-1-fast-reasoning) |
LMArena (CC-BY 4.0, best reasoning setting, 2026-10-02) · GPQA Diamond: Epoch AI (CC-BY 4.0)
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