If you’re still using claude-3-haiku-20240307, you have exactly one day left. On April 20, Anthropic will shut the model down for good. After that, there’s no grace period, no silent redirect — API calls will simply fail.
The timeline
Anthropic announced the deprecation back on February 19, giving developers two months to prepare. Still, tomorrow’s shutdown will likely catch some developers off guard. Haiku 3 was long the cheapest Claude model and is baked into many production workflows.
What changes
The recommended successor is Claude Haiku 4.5 (claude-haiku-4-5-20251001). The good news: Haiku 4.5 is significantly more capable — 64,000 output tokens instead of 4,000, Extended Thinking, better reasoning. The less good news: it costs four times as much. Haiku 3 was $0.25 per million input tokens. Haiku 4.5 is $1.
For applications that rely on high throughput at low cost, that’s a noticeable jump.
Part of a bigger wave
Haiku 3 isn’t the only retirement. On June 15, Claude Sonnet 4 and Claude Opus 4 follow — the original versions, not the current 4.6 and 4.7 releases. Anthropic is systematically cleaning up its model portfolio to free compute capacity for newer models.
What to do now
If you’re not sure whether your application still uses Haiku 3: head to the Anthropic Console under ‘Usage’ and download a CSV export. It shows exactly which API keys call which models. Then it’s time to switch to claude-haiku-4-5-20251001, test, and deploy.
One day left.
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