Copilot News 09/22/2026 AI Rating: High

Claude Opus 5.5 Arrives in GitHub Copilot, Matching Opus 5 in Fewer Steps

#GitHubCopilot#Claude#Anthropic#ClaudeOpus#DeveloperTools

GitHub made Anthropic’s Claude Opus 5.5 available in GitHub Copilot, positioned for agentic coding, long-running agentic tasks, and knowledge work.

Details

  • Efficiency gain: resolves tasks comparably to Claude Opus 5 while using significantly fewer steps and tokens
  • Built-in watermarking: includes text watermarking that doesn’t affect quality or cost
  • Error recovery: demonstrates strong recovery from errors during complex, multistep workflows
  • Supported surfaces: Visual Studio Code, Visual Studio, Copilot CLI, the coding agent, github.com, GitHub Mobile (iOS/Android), JetBrains IDEs, Xcode, and Eclipse
  • Eligibility: Copilot Pro+, Max, Business, and Enterprise subscribers, with gradual rollout and admin-controlled access via model policies for Business/Enterprise

What happened next

Opus 5.5’s efficiency-focused positioning — same quality, fewer steps and tokens — mirrors the cost-per-task framing OpenAI used for GPT-6 Sol and Luna the same week, suggesting model providers are converging on efficiency, not just raw capability, as the next competitive axis for coding-focused models.

Source https://github.blog/changelog/2026-09-22-claude-opus-5-5-is-now-available-in-github-copilot

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