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Model details
Grok 4 Fast (Reasoning)
Find out what this model does, when it was released, and which provider serves it.
Azure Cognitive Servicesgrok-4-fast-reasoninggrok
Quick Info
- Provider
- Azure Cognitive Services
- Model key
- grok-4-fast-reasoning
- Release date
- Sep 19, 2025
- Last updated
- Sep 19, 2025
- Knowledge
- 2025-07
- Input modalities
- text, image
- Output modalities
- text
- Capabilities
- Reasoning, Tool calling, Attachments, Temp controls
- Cost summary
- In $0.20 · Out $0.50
- Limit summary
- 2,000,000 token context window
Cost
- Input token cost
- $0.20
- Output token cost
- $0.50
Limits
- Output tokens
- 30,000 tokens
- Context window
- 2,000,000 tokens