GitHub will retire Claude Opus 5, Opus 4.8, and GPT-5.6 Terra from Copilot on November 16

GitHub will stop offering three models in Copilot on November 16, 2026: Claude Opus 4.8, Claude Opus 5, and GPT-5.6 Terra. The change covers every Copilot experience, including Copilot Chat, inline edits, ask and agent modes, and code completions. GitHub says workflows and integrations that name one of these models should move to a supported model before that date.

What replaces each model

GitHub suggests a replacement for each model. For both Claude models it is Claude Opus 5.5, while users of GPT-5.6 Terra are pointed to GPT-6.1 Sol or GPT-6 Luna.

Claude Opus 4.8 stays available to individual Copilot subscribers on annual plans, so the retirement does not apply to them. In Copilot Business and Copilot Enterprise, the replacements are switched on automatically under default model enablement. That does not happen if an administrator turned off the global default or disabled the specific model, and in that case the new models have to be enabled through their policies in Copilot settings. The retired models are removed without any action.

Copilot now fixes code scanning alerts on its own

Also on October 15, 2026, GitHub made agentic autofix for code scanning alerts generally available. Code scanning uses CodeQL, GitHub's code analysis engine, to report security problems and bugs as alerts. When an alert is assigned to Copilot, the agent reads the relevant files, writes a fix, and reruns CodeQL to check that the alert is closed. It repeats the cycle if needed, then opens a draft pull request with a summary, the reason the fix works, and the checks it ran.

Alerts can be assigned one at a time, up to 25 at once into a single pull request, or through the REST API. Only alerts on a repository's default branch qualify, so alerts found only in pull requests or on other branches cannot be assigned. Further changes are requested through comments on the pull request or in the repository's Agents tab.

The feature is limited to GitHub Code Security and GitHub Advanced Security customers on GitHub Enterprise Cloud, including Enterprise Cloud with data residency. An enterprise administrator must first enable the new Agentic autofix policy, and a Copilot billing method must be set. Each fix consumes AI Credits from the Code Security budget plus GitHub Actions minutes. Once enabled, the feature replaces the free Generate Fix option on individual alerts with an Assign to Copilot button.