Released Mar 31, 2026Knowledge cutoff Sep 1, 20252,000,000 context
$2/M input tokens$6/M output tokens$5/K web search
Grok 4.20 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 reasoningenabled parameter in the API. Learn more in our docs
xAI: Grok 4.20 – Uptime and Availability | OpenRouter