On October 29, 2026, we removed Claude Haiku 4.5 from the model selector in chat, Claude Cowork, and Claude Design on the Free, Pro, and Max plans, including in Claude Desktop and Claude Mobile. Claude Haiku 5.5 replaced it. This article explains what changed, where Haiku 4.5 is still available, and what happened to your existing chats.
What changed and when
We announced this change on October 15, 2026. As of October 29, 2026, you can no longer select Haiku 4.5 under “More models” in the model selector. If it was your selected model, Claude switched you to Haiku 5.5.
Where Haiku 4.5 is still available
This change didn't affect Haiku 4.5 in:
Claude Code
Team and Enterprise plans
Claude Platform (API)
What happened to your existing chats
Your Haiku 4.5 chats are still in your account, and nothing was deleted. When you continue one after October 29, Claude responds using Haiku 5.5. You can switch to a different model at any time.
To keep a copy of your chats, you can export your data at any time. Learn more about exporting your Claude data.
Switch models in a chat
You can change the model at any point in a chat. The change applies starting with Claude’s next response.
Click the model name next to the send button.
Choose a model, or click “More models” to see additional options.
Learn more about changing the model, effort, and thinking settings.