---
title: "Anthropic Claude Haiku 3.5 model: retirement on 2026-02-19 | Harbyn"
description: "Anthropic Claude Haiku 3.5 model: retirement on 2026-02-19; replacement: claude-haiku-4-5-20251001."
canonical: "https://harbyn.com/changes/anthropic/2025-12-19-claude-haiku-3-5-model-retirement"
last-updated: 2026-09-21
---

# Anthropic Claude Haiku 3.5 model: retirement on 2026-02-19

Markdown version of <https://harbyn.com/changes/anthropic/2025-12-19-claude-haiku-3-5-model-retirement>.

Retirement - Anthropic. high severity. In effect. History: recorded after the fact.

Anthropic retires claude-3-5-haiku-20241022 on the Claude API on 2026-02-19. Requests to retired models fail. Recommended replacement: claude-haiku-4-5-20251001.

The deadline passed on Feb 19, 2026.

## Facts

| Fact | Value |
| --- | --- |
| Vendor | [Anthropic](https://harbyn.com/vendors/anthropic.md) |
| Product | models |
| Kind | Retirement |
| Severity | high |
| Status | In effect |
| Announced | Dec 19, 2025 |
| Effective | Feb 19, 2026 |
| Added to Harbyn | Sep 21, 2026 |
| Lead time | Recorded after the fact: added 214 days after the deadline |
| Model IDs | `claude-3-5-haiku-20241022` |
| Replacement | `claude-haiku-4-5-20251001` |
| Review | Automated, extracted by a deterministic parser |

## Find it in your code

```sh
npx harbyn scan
```

The scanner reads your repository on your machine and reports every file and line that uses the identifiers above, with the replacement. Nothing leaves your machine.

## Sources

Where this event comes from: the page we read, when we read it, and the hash of that snapshot.

- <https://platform.claude.com/docs/en/about-claude/model-deprecations.md> (deprecations, fetched 2026-09-21 03:10 UTC, sha256 `3a2df47b1dd8818789c13f72c5e81c2cd58b539087ee855d52e9e47527075a07`)

## Related changes

### More from Anthropic

- [Claude Sonnet 3.7 model: retirement on 2026-02-19](https://harbyn.com/changes/anthropic/2025-10-28-claude-sonnet-3-7-model-retirement.md) (Retirement, effective Feb 19, 2026)
- [Claude Haiku 3 model: retirement on 2026-04-20](https://harbyn.com/changes/anthropic/2026-02-19-claude-haiku-3-model-retirement.md) (Retirement, effective Apr 20, 2026)
- [Claude Sonnet 4 and Claude Opus 4 models: retirement on 2026-06-15](https://harbyn.com/changes/anthropic/2026-04-14-claude-sonnet-4-and-claude-opus-4-models-retirement.md) (Retirement, effective Jun 15, 2026)
- [Claude Sonnet 3.5 models: retirement on 2025-10-28](https://harbyn.com/changes/anthropic/2025-08-13-claude-sonnet-3-5-models-retirement.md) (Retirement, effective Oct 28, 2025)

### Changes at other vendors

- [OpenRouter: arcee-ai/trinity-large-thinking expire 2026-10-26](https://harbyn.com/changes/openrouter/2026-10-23-arcee-ai-trinity-large-thinking-expires-2026-10-26.md) (effective Oct 26, 2026)
- [Google Cloud Run and Functions: Node.js 20 runtime decommission](https://harbyn.com/changes/google-cloud/2026-10-08-node-js-20-runtime-decommission.md) (effective Oct 30, 2026)
- [Mistral AI: Z.ai GLM 5.2 (zai-glm-5-2) retires on Mistral on October 31, 2026](https://harbyn.com/changes/mistral/2026-09-29-z-ai-glm-5-2-deprecated-and-scheduled-for-retirement.md) (effective Oct 31, 2026)
- [Fireworks AI: DeepSeek V4 Flash 0731 retires from Serverless Training November 2](https://harbyn.com/changes/fireworks/2026-10-18-upcoming-serverless-training-deprecation-deepseek-v4-flash-0731.md) (effective Nov 2, 2026)

[All upcoming deadlines](https://harbyn.com/deadlines.md)