GitHub Copilot added Opus 5.5 and GPT-6 Sol/Luna on launch day, a day after Grok 4.7
GitHub Changelog·medium signal
The GitHub Changelog for 2026-09-22 carries separate entries for Claude Opus 5.5 and for OpenAI's GPT-6 Sol and Luna in Copilot, following Grok 4.7 on 09-21. The same day brought OpenTelemetry in the Copilot app and JetBrains plugin updates. Copilot now ships frontier models within hours of the vendor launch. The lab APIs' 40-50% price cuts do not reach Copilot users until GitHub changes its premium-request multipliers, which the entries do not state.