xAI: Grok 4.20

x-ai/grok-4.20

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

Providers for Grok 4.20

OpenRouter routes requests to the best providers that are able to handle your prompt size and parameters, with fallbacks to maximize uptime.

Performance for Grok 4.20

Compare different providers across OpenRouter

Effective Pricing for Grok 4.20

Actual cost per million tokens across providers over the past hour

Apps using Grok 4.20

Top public apps this month

Recent activity on Grok 4.20

Total usage per day on OpenRouter

Prompt

1.72B

Completion

36.4M

Reasoning

18.2M

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

Uptime stats for Grok 4.20

Uptime stats for Grok 4.20 across all providers

Sample code and API for Grok 4.20

OpenRouter normalizes requests and responses across providers for you.

OpenRouter supports reasoning-enabled models that can show their step-by-step thinking process. Use the reasoning parameter in your request to enable reasoning, and access the reasoning_details array in the response to see the model's internal reasoning before the final answer. When continuing a conversation, preserve the complete reasoning_details when passing messages back to the model so it can continue reasoning from where it left off. Learn more about reasoning tokens.

In the examples below, the OpenRouter-specific headers are optional. Setting them allows your app to appear on the OpenRouter leaderboards.

Using third-party SDKs

For information about using third-party SDKs and frameworks with OpenRouter, please see our frameworks documentation.

See the Request docs for all possible fields, and Parameters for explanations of specific sampling parameters.

Grok 4.20 - API Pricing & Providers | OpenRouter