Grok 4 changelog

xAI retires older Grok models, requests redirect to Grok 4.3

On May 15, 2026 xAI retired grok-4-1-fast, grok-4-fast, grok-4-0709, grok-code-fast-1, grok-3 and grok-imagine-image-pro. Requests to these slugs redirect to grok-4.3 (or grok-build-0.1 for grok-code-fast-1) and are billed at grok-4.3 rates of $1.25 input and $2.50 output per 1M tokens.

Who is affected:

Apps still calling the retired Grok slugs, which now get a different model at a different price.

Action needed:

Set the model explicitly to grok-4.3 with the reasoning effort you want, or grok-build-0.1 for coding.