{"slug": "claude-sonnet-4-5-deprecated-retires-2026-09-29-claude-sonnet-5-5", "title": "Claude Sonnet 4.5 deprecated, retires 2026-09-29 → Claude Sonnet 5.5", "summary": "Anthropic has deprecated Claude Sonnet 4.5 (claude-sonnet-4-5-20250929), with retirement set for 2026-09-29, according to the provider's model deprecation announcement. The model, which supports text and vision with a 1000k context window and 64k max output, is being succeeded by Claude Sonnet 5.5. The deprecation affects code that calls the model under aliases including claude-sonnet-4-5, claude-sonnet-4.5, and anthropic/claude-sonnet-4-5.", "body_md": "AN✕ Retired\n\n# Claude Sonnet 4.5\n\nAnthropic · claude-sonnet-4-5-20250929\n\nClaude Sonnettext+vision1000k context64k max out\n\nalso matches: \n\n`claude-sonnet-4-5-20250929`` claude-sonnet-4-5``claude-sonnet-4.5`` microsoft/claude-sonnet-4-5``anthropic/claude-sonnet-4-5-20250929`` anthropic/claude-sonnet-4-5`\n[provider announcement →](https://docs.claude.com/en/docs/about-claude/model-deprecations)\n\nDoes your code call Claude Sonnet 4.5?\n\n$ curl -fsSL https://llmstatus.ai/install.sh | bash\n\nThen `mm status` in any repo — it finds every model you use and flags the ones on a clock. No account, nothing uploaded.\n\n[Get alerted before it retires →](https://llmstatus.ai/sign-up)", "url": "https://wpnews.pro/news/claude-sonnet-4-5-deprecated-retires-2026-09-29-claude-sonnet-5-5", "canonical_source": "https://llmstatus.ai/m/anthropic/anthropic/claude-sonnet-4-5", "published_at": "2026-10-01 00:00:26+00:00", "updated_at": "2026-10-01 00:48:50.240368+00:00", "lang": "en", "topics": ["large-language-models", "ai-products", "developer-tools"], "entities": ["Anthropic", "Claude Sonnet 4.5", "Claude Sonnet 5.5", "claude-sonnet-4-5-20250929", "llmstatus.ai"], "also_reported_by": [], "alternates": {"html": "https://wpnews.pro/news/claude-sonnet-4-5-deprecated-retires-2026-09-29-claude-sonnet-5-5", "markdown": "https://wpnews.pro/news/claude-sonnet-4-5-deprecated-retires-2026-09-29-claude-sonnet-5-5.md", "text": "https://wpnews.pro/news/claude-sonnet-4-5-deprecated-retires-2026-09-29-claude-sonnet-5-5.txt", "jsonld": "https://wpnews.pro/news/claude-sonnet-4-5-deprecated-retires-2026-09-29-claude-sonnet-5-5.jsonld"}}