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xAI: Grok 4.20

x-ai/grok-4.20

Released Mar 31, 2026Knowledge cutoff Sep 1, 20252,000,000 context$1.25/M input tokens$2.50/M output tokens

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 reasoning enabled parameter in the API. Learn more in our docs

Recent activity on Grok 4.20

Total usage per day on OpenRouter

Prompt
1.31B
Completion
42.5M
Reasoning
24.9M

Prompt tokens measure input size. Reasoning tokens show internal thinking before a response. Completion tokens reflect total output length.