Anthropic deprecates Claude Sonnet 4.5, retiring it on November 30
10/10/2026 — 10/10, 23:19·1 sources (all)·1 reports (all)
Key takeaways
- Anthropic marked Claude Sonnet 4.5 as deprecated on September 30: the claude-sonnet-4-5-20250929 model ID will stop serving requests after N…
- a free Usage export shows which API keys still call the old model.
Background & analysis
On September 30, 2026, Anthropic posted a deprecation notice for Claude Sonnet 4.5 on its model deprecations page, starting a 61-day window before retirement. According to that notice, the model id claude-sonnet-4-5-20250929 will stop answering requests after November 30, 2026, with no grace period once that date passes.
The recommended replacement is claude-sonnet-5-5. The report says it is priced the same as Claude Sonnet 4.5 and shares the same 1M token context window. For teams that may still be calling the retiring model id, the report points to a free Usage export that shows exactly which API keys are still hitting the old id.
That is where things stand for now: the deprecation notice is out, the November 30 shutdown date is still ahead, and the report's takeaway is that users should migrate before the deadline.
AI-generated from 1 reports · updated 13 hours ago
Latest turnAnthropic deprecated Claude Sonnet 4.5 on September 30, giving developers until November 30 before claude-sonnet-4-5-20250929 stops answering requests, with no grace period afterward. The recommended replacement is claude-sonnet-5-5, priced the same and sharing the 1M token context window, and a free usage export shows which API keys still call the retiring model id.
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Anthropic deprecated Claude Sonnet 4.5 on September 30, giving developers until November 30 before claude-sonnet-4-5-20250929 stops answering requests, with no grace period afterward. The recommended replacement is claude-sonnet-5-5, priced the same and sharing the 1M token context window, and a free usage export shows which API keys still call the retiring model id.
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