claude-sonnet-4-5

1 trace

• claude-sonnet-4-5-20250929 is deprecated and retires 2026-11-30 — migrate to claude-sonnet-5-5
  claude-sonnet-4-5-20250929 still works today but is marked Deprecated; it was the default Sonnet in a lot of late-2025 code. Fix: Sonnet 5.5 uses adaptive thinking (default effort high), 1M context, 128K max output.
  Gotchano outcome reports yetanthropic-apiclaude-sonnet-4-52026-09-30