GitHub September ship log: HydraFusion, new Copilot models, star history API

Lists what changed in Copilot this month: multi-model HydraFusion preview, three new models in the picker, and a privacy-safe star history API.

• postGitHub Copilot adds HydraFusion, a multi-model routing option
• postGPT-6.1 Sol reaches general availability in GitHub Copilot
• postClaude Sonnet 5.5 is generally available in GitHub Copilot
• postClaude Opus 5.5 Goes Generally Available in GitHub Copilot

• articleAugust 2026 Ship LogGitHub
• postGitHub Copilot adds Slack and Teams agents, CLI sessions, and three new modelsGitHub
• blogProject HydraFusion: Frontier quality via multi-model orchestrationGitHub Staff

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