Obituaries · Anthropic
claude-3-5-sonnet-20241022, 2024–2025
Anthropic model switched off after 1 year
Known to its friends as 'the new 3.5 Sonnet', a name that confused everyone, including its makers. It could use a computer, slowly.
claude-3-5-sonnet-20241022, an Anthropic model that answered questions, wrote emails and was blamed for both, was switched off on October 28, 2025, aged 1 year. The family was informed on August 13, 2025 by changelog, which is how families are informed now. Requests addressed to it are expected to come back unanswered.
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 still names it:
- Graphify-Labs/graphify (142,643 stars) ·
graphify/llm.py - browser-use/browser-use (120,083 stars) ·
.github/workflows/claude.yml - headroomlabs-ai/headroom (78,887 stars) ·
headroom/integrations/langchain/providers.py
| Model ID | claude-3-5-sonnet-20241022 |
|---|---|
| Provider | Anthropic deprecations page |
| Born | October 22, 2024 |
| Announced | August 13, 2025 |
| Shut down | October 28, 2025 |
| Successor | claude-sonnet-5-5 |
In lieu of flowers
Replace the string. Search your code for claude-3-5-sonnet-20241022 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.
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Technical notice, with a code scanner: claude-3-5-sonnet-20241022 on Model Graveyard Check