Three releases landed in one week: Opus 5.5 and GPT-6 Sol/Luna arrived in GitHub Copilot on September 22, and Sonnet 5.5 followed on September 28. I don't think the top end is the story. The story is cost: the cheap tiers now compete with last month's premium models. Every benchmark number below is vendor-reported, so read it as a claim, not a measurement.
GitHub has announced changes to its Copilot Individual plans — Free, Pro, and Pro+ — taking effect in April 2026. The details are in the company news post and the changelog entry. Our reaction: unsurprising — and overdue. For historic context (see the Copilot plans page and GitHub's 2025 Pro+ announcement): Copilot Pro has been $10/month since launch, back when frontier models were cheaper and agent mode didn't exist, and Pro+ arrived in April 2025 at $39/month. The economics of that original entry-level tier were never going to survive a world of agentic coding on frontier models. This post is commentary, not a restatement of GitHub's announcement — read the source for the actual numbers.