Copilot retires six models including GPT-5.5 and GPT-5.4 on October 19, pointing users to GPT-6.1 Sol and GPT-6 Luna
The retirement announced on September 18 takes effect today, and workflows using these models need to switch.
// Key points
- As of October 19 these models are deprecated across most Copilot experiences, including Copilot Chat, inline edits, ask and agent modes, and code completions.
- GPT-5.5 and GPT-5.4 point to GPT-6.1 Sol; GPT-5.4 mini and GPT-5 mini to GPT-6 Luna; Gemini 3.7 Flash to Gemini 3.8 Flash; Grok 4.5 to Grok 4.7.
- Copilot Enterprise admins may need to enable alternatives through model policies; deprecated models are removed automatically.
Builder's takeTogether with the mid-November retirement notice on 10-16, Copilot is swapping models twice in a month. If scripts or extensions hard-code model names, check them today; the sturdier pattern is to name a tier (strong / fast) and keep model names in one config.
// Background · from #Coding agents
Full timeline →- Oct 20 Cloudflare cuts the average cost of its internal AI code review 68%, from $2.43 to $0.77
- Oct 20 GitHub opens a Copilot model policy REST API at enterprise, team, app and organization level, generally available
- Oct 20 GitHub: during unusual traffic, some anonymous HTTPS clones of public repositories may temporarily require authentication