Model page
Grok-4.20 Reasoning
xAI's flagship Grok 4.20 reasoning model with a 2M-token context window, stronger multi-step reasoning, and native tool support.
Key dates
We use concrete dates and keep them consistent across the site.
Capability
Intelligence
High
Capability
Speed
Medium
Capability
Context window
2,000,000 tokens
API
Supported endpoints
v1/chat/completions · v1/responses · v1/batch
Modalities
Input and output
Input: Text, Image
Output: Text
Features
Availability notes
4M TPM · 607 RPM · Structured outputs, web search, X search, function calling, and code execution supported
ChatGPT
GPT‑4o retirement (ChatGPT)
OpenAI is retiring GPT‑4o inside ChatGPT on February 13, 2026. This does not automatically imply API removal.