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Default to Sonnet 4.5 in BYOK (#39132)

<img width="381" height="204" alt="Screenshot 2025-09-29 at 2 29 58 PM"
src="https://github.com/user-attachments/assets/c7aaf0b0-b09b-4ed9-8113-8d7b18eefc2f"
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Release Notes:

- Claude Sonnet 4.5 and 4.5 Thinking are now the recommended Anthropic
models
3ae65153dbRichard Feldman committed on 9/29/2025, 6:56:03 PM· committed by GitHubparentffc9060
3 files changedLine totals unavailable