claude opus 4.8 thru github copilot doesn't show thinking #36120

This issue might be a duplicate of or closely related to existing issues. Please check:

• fix(copilot): claude-sonnet-4.6 max reasoning effort not available; model key mismatch on refresh #33607: Claude models via GitHub Copilot have reasoning effort limitations and model key mismatches that affect thinking/reasoning display

If the thinking feature works with other providers but not GitHub Copilot specifically, the root cause may be the Copilot-specific reasoning effort handling described in #33607.

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