This date has passed. If it just broke for you, what to do is below.
criticalShutdown
Claude Haiku 3.5 is retired from the Claude API
- Announced
- 19 Dec 2025
- Effective
- passed 19 Feb 2026
- Source
- the vendor’s own page · last checked 23 Sept 2026
What breaks
Requests naming this model return an error from the retirement date. Nothing degrades gradually — the call simply stops working.
What to do
Move to claude-haiku-4-5-20251001.
Advice confirmed 23 Sept 2026
What the vendor said
On 19 December 2025 Anthropic notified developers using claude-3-5-haiku-20241022 of its upcoming retirement.