# claude-3-haiku

Calls to the model claude-3-haiku on Anthropic stopped working on April 20, 2026.

Anthropic retired model claude-3-haiku on April 20, 2026, following its deprecation on February 19, 2026. Calls targeting this model fail since that date.

## The error Anthropic returns once claude-3-haiku is gone

HTTP 404

```json
{"type":"error","error":{"type":"not_found_error","message":"model: claude-3-haiku"}}
```

## What to use instead

Move to claude-haiku-4-5-20251001, recommended by Anthropic.

- API: Anthropic (api.anthropic.com)
- Model: claude-3-haiku
- Kind: Model retirement
- Announced: February 19, 2026
- Takes effect: April 20, 2026
- Calls after that day: fail
- Calls it hits: `model claude-3-haiku`
- Source: [Deprecations page](https://platform.claude.com/docs/en/about-claude/model-deprecations)
- Verified: November 6, 2026, against Anthropic's own pages
- Page: https://www.okapi.bot/models/anthropic/claude-3-haiku/

## Anthropic's words

> API model name: claude-3-haiku-20240307; Current state: Retired; Deprecated: February 19, 2026; Tentative retirement date: April 20, 2026

Okapi finds the calls this change hits in your repo and opens the pull request with the fix: https://github.com/apps/okapi-agent