How much does grok-4.20-fast:free cost per 1M tokens?

Input is priced at $0.00 per 1M tokens, output at $0.00 per 1M tokens. Billing is per token, no rounding to batch sizes.

How do I access grok-4.20-fast:free via API?

Send requests to the UnoRouter /v1/chat/completions endpoint with model=grok-4.20-fast:free. Any OpenAI-compatible client library works. Authentication uses a standard Bearer token.

xAI: grok-4.20-fast:free

Name: grok-4.20-fast:free
Brand: xAI

grok-4.20-fast:free

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

Pricing

Input price

$0.00/ 1M tokens

Output price

$0.00/ 1M tokens

All providers for this model are busy right now

Every upstream provider has hit its rate limit. The model comes back automatically once limits lift, usually within hours. Try again in a little while or switch to another model.

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xAI: grok-4.20-fast:free

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