Grok 4.1 Fast (Reasoning)
xAI's fast agentic tool-calling model with a 2M context window and built-in reasoning
xai/grok-4.1-fast-reasoning- Lab
- xAI
- Family
- grok
- Providers
- 9
- Context
- 2,000,000
- Output limit
- 30,000
- Knowledge
- -
- Release
- 2025-11-19
- Updated
- 2025-11-19
- Weights
- Closed
- Input
- Output types
- Capabilities
- tools, reasoning, temperature
Providers
9| 302.AI | xAI | grok-4-1-fast-reasoning | 2,000,000 | 30,000 | $0.20 / $0.50 | Yes | Yes | - | Yes |
|---|---|---|---|---|---|---|---|---|---|
| DevPass (LLM Gateway) | xAI | grok-4-1-fast-reasoning | 2,000,000 | 30,000 | $0.20 / $0.50 | Yes | Yes | Yes | Yes |
| FrogBot | xAI | grok-4-1-fast-reasoning | 2,000,000 | 128,000 | $0.20 / $0.50 | Yes | Yes | - | Yes |
| Helicone | xAI | grok-4-1-fast-reasoning | 2,000,000 | 2,000,000 | $0.20 / $0.50 | Yes | Yes | - | Yes |
| Jiekou.AI | xAI | grok-4-1-fast-reasoning | 2,000,000 | 30,000 | $0.19 / $0.475 | Yes | Yes | Yes | Yes |
| LLM Gateway | xAI | azure-ai-foundry/grok-4-1-fast-reasoning | 2,000,000 | 30,000 | $0.20 / $0.50 | Yes | Yes | No | Yes |
| Poe | xAI | xai/grok-4.1-fast-reasoning | 2,000,000 | 30,000 | - | Yes | Yes | - | No |
| Qiniu | xAI | x-ai/grok-4.1-fast-reasoning | 20,000,000 | 2,000,000 | - | Yes | Yes | No | Yes |
| Vertex | xAI | xai/grok-4.1-fast-reasoning | 128,000 | 30,000 | $0.20 / $0.50 | Yes | Yes | Yes | Yes |
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