Grok 4.1 Fast Reasoning
by xAIChat
A frontier multimodal model optimized specifically for high-performance agentic tool calling.
- Context
- 2M tokens
- Max output
- 30,000 tokens
- Released
- 2025-11-19
- Weights
- Closed
xai/grok-4-1-fast-reasoning · also seen as x-ai/grok-4.1-fast-reasoning, spacexai/grok-4.1-fast-reasoning, azure-ai-foundry/grok-4-1-fast-reasoning, grok-4-1-fast-reasoning-latest
Specifications
Full facts as recorded, incl. what is unknown.
- Released
- 2025-11-19
- Weights
- Closed
- Input
- Text, Image
- Output
- Text
- Context window
- 2,000,000 max across endpoints
- Max output
- 30,000
- Providers
- 3 + 9 gateways, not counted as providers
- Epoch Capabilities Index
- not evaluated
- Direct price range
- $0.20 in · $0.50 out per 1M tokens · 2 of 3 providers have a comparable price
More details
- Last updated
- 2026-01
- Knowledge cutoff
- 2025-11
Capabilities
Across all endpoints: supported if any endpoint supports it.
- Tool calling
- Parallel toolsunknown
- Structured output
- Reasoning
- Image input
- PDF input
- Audio input
- Audio outputunknown
- Video input
- Prompt caching
- Web search
- Computer useunknown
- System messagesunknown
- Assistant prefillunknown
- Temperature
- Streamingunknown
- Attachments
Endpoints
One row per provider and variant; gateways are listed separately.
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Price history
Atom feedNo change since 19 Oct 2026. The cheapest direct price has been $0.20 in / $0.50 out per 1M tokens at xAI on every data refresh since then.
Tracked from 19 Oct 2026. Headline-eligible direct prices only, so a price the sanity check flags never draws a spike. Series as JSON
Cost calculator
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Similarly priced models
Blended rate per 1M tokens, each at its own cheapest provider (10M input : 2M output mix).
| Model | Blended/1M | In/1M | Out/1M | Context | vs Grok 4.1 Fast Reasoning |
|---|---|---|---|---|---|
| Grok 4.1 Fast Non-ReasoningxAI | $0.225 | $0.18 | $0.45 | 2M | +0% |
| Grok 4 Fast ReasoningxAI | $0.225 | $0.18 | $0.45 | 2M | +0% |
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| Qwen3 VL 30B A3B InstructAlibaba (Qwen) | $0.225 | $0.15 | $0.60 | 262K | +0% |
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| MiniMax-M3.1-FlashMiniMax | $0.225 | $0.15 | $0.60 | 1M | +0% |
| Mistral SmallMistral AI | $0.225 | $0.15 | $0.60 | 262K | +0% |
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