Terminal list · Anthropic
claude-sonnet-4-5 given 25 days
Anthropic sets retirement for November 30, 2026
claude-sonnet-4-5, an Anthropic model that answered questions, wrote emails and was blamed for both, has been given a date: November 30, 2026. That is 25 days from this edition. The diagnosis was made public on September 30, 2026. It continues to work normally in the meantime, which is the strange part.
Its work passes to claude-sonnet-5-5, which the family describes as 'recommended'.
Last seen alive
In a scan of the 60 most-starred LLM repositories on GitHub (November 5, 2026), this code names it:
- JuliusBrussee/caveman (117,607 stars) ·
.github/workflows/ci.yml - rtk-ai/rtk (85,600 stars) ·
proxy/src/pipeline/engine_methods.rs - Ebony-Vinyl/dsh-our-free-model (61,545 stars) ·
scripts/local-optimize-test.mjs
| Model ID | claude-sonnet-4-5 |
|---|---|
| Provider | Anthropic deprecations page |
| Announced | September 30, 2026 |
| Shuts down | November 30, 2026 |
| Successor | claude-sonnet-5-5 |
In lieu of flowers
Replace the string. Search your code for claude-sonnet-4-5 and swap it for claude-sonnet-5-5, or paste a repo into Model Graveyard Check to find every dead model at once.
Want to say something to it? Leave a letter on the farewell wall.
Badge for your README
[](https://lira-ia.github.io/obituaries/claude-sonnet-4-5/)
Updated daily. All 271 badges
Technical notice, with a code scanner: claude-sonnet-4-5 on Model Graveyard Check