Last refreshed 2026-05-20. Next refresh: weekly.
Why use Grok 4.20 Reasoning on xAI Console?
xAI Console offers Grok 4.20 Reasoning with pay-as-you-go pricing at $1.25/1M input tokens. xAI, founded by Elon Musk in March 2023, focuses on advancing scientific discovery and understanding the universe through AI.
Setup recipe
Docs fallbackUse the provider REST API or SDKCreate a provider API keymodel: grok-4.20-0309-reasoninggrok-4.20-0309-reasoningRequest example
grok-4.20-0309-reasoning.Gotchas
- Use provider model ID "grok-4.20-0309-reasoning", not the LLMReference slug "grok-4.20-reasoning".
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $1.25 |
| Output tokens | $2.50 |
Capabilities
About Grok 4.20 Reasoning
Grok 4.20 Reasoning is the xAI API reasoning variant launched around March 10, 2026 as grok-4.20-0309-reasoning. The prior May 2026 seed date was a placeholder; this model was already available months earlier and remains active.
FAQ
What does Grok 4.20 Reasoning cost on xAI Console?
On xAI Console, Grok 4.20 Reasoning costs $1.25 per 1M input tokens and $2.50 per 1M output tokens.
What is the context window for Grok 4.20 Reasoning on xAI Console?
Grok 4.20 Reasoning supports a 1,000,000 token context window on xAI Console.
What API model ID do I use for Grok 4.20 Reasoning on xAI Console?
Use the model ID grok-4.20-0309-reasoning when calling xAI Console's API.
Who created Grok 4.20 Reasoning?
Grok 4.20 Reasoning was created by xAI as part of the Grok 4 model family.
Is Grok 4.20 Reasoning open source?
Grok 4.20 Reasoning's open source status is unknown in the seed data.