About Grok 4.20 Beta
Grok 4.20 Beta is xAI's newest flagship model with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance, delivering consistently precise and truthful responses.
Reasoning can be enabled/disabled using the `reasoning` `enabled` parameter in the API. [Learn more in our docs](https://openrouter.ai/docs/use-cases/reasoning-tokens#controlling-reasoning-tokens)
Specifications
- Provider
- xAI
- Context Length
- 2,000,000 tokens
- Input Types
- text, image
- Output Types
- text
- Category
- Grok
- Added
- 3/12/2026