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GitHub Copilot’s Claude Opus 4.5 doesn’t use reasoning #45668
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area:ai/copilotfrequency:uncommonBugs that happen for a small subset of users, special configurations, rare circumstances, etcBugs that happen for a small subset of users, special configurations, rare circumstances, etcpriority:P3Papercuts, minor issues with a clear workaround, cosmetic bugsPapercuts, minor issues with a clear workaround, cosmetic bugsstate:needs reproNeeds reproduction steps and/or someone to reproduceNeeds reproduction steps and/or someone to reproduce
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area:ai/copilotfrequency:uncommonBugs that happen for a small subset of users, special configurations, rare circumstances, etcBugs that happen for a small subset of users, special configurations, rare circumstances, etcpriority:P3Papercuts, minor issues with a clear workaround, cosmetic bugsPapercuts, minor issues with a clear workaround, cosmetic bugsstate:needs reproNeeds reproduction steps and/or someone to reproduceNeeds reproduction steps and/or someone to reproduce
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Reproduction steps
Current vs. Expected behavior
Current behaviour:
Immediately does tool_calling instead of reasoning. Doesn't use reasoning at all.
Expected behaviour (sniffed from VSCode):
Uses reasoning.
Zed version and system specs
Zed: 0.217.3 80433cb (0.217.3+stable.105.80433cb239e868271457ac376673a5f75bc4adb1)
OS: MacOS 15.6.1
Arch: arm64
Ram: 16GB
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Relevant Keymap
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(for AI issues) Model provider details
Provider: Github Copilot
Model: Claude Opus 4.5
Mode: Agent (sidebar)
If you are using WSL on Windows, what flavor of Linux are you using?
None