xAI: Grok 4.20

Grok 4.20 is a reasoning model from xAI 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)

• Context window: 2,000,000 tokens
• Input: text, image, file
• Output: text
• Pricing: $1.25/M input tokens, $2.5/M output tokens

View on OpenRouter. Model data sourced from OpenRouter.