# Grok 4.20 Beta: AI model fact sheet

- **Provider:** xai
- **Released:** 2026-03-12
- **Context window:** 2,000,000 tokens
- **Max output:** 32,768 tokens
- **API pricing:** $2.00 / 1M input, $6.00 / 1M output
- **OpenRouter ID:** x-ai/grok-4.20-beta
- **Capabilities:** conversation, reasoning, code-generation, analysis, tool-use, function-calling, agentic-tool-use

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 adherence, delivering consistently precise and truthful responses. Reasoning can be enabled/disabled using the reasoning enabled parameter in the API.

Source: real side-by-side outputs, pricing and specs at https://rival.tips/models/grok-4.20-beta