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  1. Microsoft Official Blog72

    Microsoft opens the Copilot harness through Foundry, supporting the development of multi-model intelligent agents

    Microsoft opens the GitHub team's Copilot harness built by GitHub through Microsoft Foundry, providing a fully managed way to build intelligent agents that can reason, call tools, and complete long tasks.

    Why it matters: Microsoft opens the multi-model harness supporting multiple Copilot products internally to Foundry, allowing readers to judge the trade-offs of building their own orchestration layer based on this.

  2. Artificial Analysis Articles72

    Artificial Analysis Reviews GitHub Copilot Fusion: Performance slightly lower than Opus 5.5, single-task cost halved

    Artificial Analysis tested GitHub Copilot CLI's Copilot Fusion highest settings in Coding Agent Index v2.0, with a single task cost of 5.59 USD, while Claude Code with Opus 5.5 (max) costs 11.42 USD, only 2 points lower in overall score.

    Why it matters: Artificial Analysis used Coding Agent Index to test Copilot Fusion, providing a cost and token comparison with Claude Code at the same performance level.

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