Anthropic is phasing out Claude Haiku 4.5 from the Claude model selector, with the change set to take effect on October 29. After that date, users will no longer see Haiku 4.5 as an option when starting or continuing chats in Claude.
The company has confirmed that Claude Haiku 5.5 will replace it in the model selection menu. Haiku 5.5 has already been available to free users since early October, giving people time to test the newer model before Haiku 4.5 disappears from the main Claude interface.
The update affects users on Claude Free, Pro, and Max plans. It applies across regular Claude chat, Claude Cowork, and Claude Design, whether accessed through the web version, desktop app, or mobile apps.
Until October 29, users can still manually select Claude Haiku 4.5 for new conversations. Once the deadline passes, the model will be removed from the selector and will no longer be available for those plan tiers in the standard Claude experience.
Not every user is affected by the change. Team and Enterprise customers will continue to have access where applicable, and Claude Code is not included in this removal. Developers using Claude Haiku 4.5 through Anthropic’s API are also not impacted by this update.
For users with existing Claude Haiku 4.5 conversations, Anthropic says those chats will remain in their accounts. Nothing will be deleted. However, if a user opens an older Haiku 4.5 chat after October 29 and continues the conversation, the responses will come from Claude Haiku 5.5 instead.
Users can still switch to other available Claude models, such as Sonnet or Opus, during a conversation if they prefer a different response style or need stronger reasoning for a particular task.
The removal of Haiku 4.5 may matter most to people who rely on the model for repeatable workflows. Users who regularly use it for quick summaries, short translations, drafting snippets, rewriting text, brainstorming, or lightweight productivity tasks may notice subtle differences with Haiku 5.5.
Even when two AI models are designed for similar use cases, they may respond differently to the same prompt. A newer model might be more detailed, ask more follow-up questions, change formatting, or interpret instructions in a slightly different way. For users who depend on consistent outputs, that can affect daily routines.
The best way to prepare is to test Claude Haiku 5.5 before October 29. Users should open a new chat, select Haiku 5.5, and run the same kinds of prompts they previously used with Haiku 4.5. This makes it easier to spot differences while both models are still available for comparison.
If Haiku 5.5 produces results that are too long, too short, or formatted differently, users may want to adjust their saved prompts, project instructions, or style preferences. Small prompt changes can often make the newer model behave more like the older one.
For most Claude users, the transition should be simple. Haiku 5.5 is intended to take over the fast, lightweight role previously filled by Haiku 4.5. Still, anyone who has built a dependable workflow around the older model should review their settings now rather than waiting until the model is removed.
In short, Claude Haiku 4.5 will leave the model selector for Free, Pro, and Max users on October 29, while Claude Haiku 5.5 becomes the default replacement. Existing chats will remain saved, but future replies in those conversations will use the newer model once the change takes effect.
