GitHub Copilot Is Now a Variable AI Cost. Here's How to Track It by Model

On October 19, GitHub retires six more Copilot models , including GPT-5.5, GPT-5.4 and GPT-5 mini. That follows six retirements on September 1, one on September 10 and four on October 2. In between, GitHub added eight models, from Gemini 3.8 Flash and GPT-6 Astra to Claude Opus 5.5 and GPT-6.1 Sol.