# Claude Haiku 5.5 in the model selector

By Steven Van · 2026-10-16

Claude Haiku 5.5 is selectable in Replit's Power Mode for Core and Pro builders, with a per-model Effort setting for how much reasoning it uses.

Builders on the Core and Pro plans can now pick Claude Haiku 5.5 in [Replit](<https://creatorstoolbox.com/tools/replit>). The model is listed in the model selector for Power Mode, as [described in the docs](<https://docs.replit.com/chat/model-selector>).

## How to choose it

Select Agent Mode in the prompt box, choose Power, then pick a model in the Primary model section. Max Mode also allows manual model selection on Core and Pro. Free Mode always uses intelligent model routing, where Replit chooses a model for the task.

## Effort setting

Each model has an Effort control, which sets how much reasoning the model spends on a response. Levels run from Low through Max, and each model shows a recommended setting. Higher settings can take longer and cost more on complex work.

## Availability

Replit says the model list in the app is the source of truth for an account, because availability can vary.

![Demo workspace model selector with GPT-5.6 Sol selected in Max Mode and Effort set to Medium](<https://mintcdn.com/replit/teDUL4A-lNO7dv1O/images/chat/model-selector-gpt-5-6-sol-effort.jpg?fit=max&auto=format&n=teDUL4A-lNO7dv1O&q=85&s=436704fc724eb28b23c5ec9d3a1151ba>)

Model and Effort controls in the Replit Agent settings menu

![Replit](<https://creatorstoolbox.com/images/replit-icon.png>)

Replit

Build, refine, and publish apps, websites, and other projects by describing what you want to Replit Agent.

[View Replit →](<https://creatorstoolbox.com/tools/replit>)

[Original source](<https://docs.replit.com/updates#claude-haiku-5-5-in-the-model-selector>)

[Read Claude Haiku 5.5 in the model selector on Creators Toolbox](<https://creatorstoolbox.com/blog/replit-claude-haiku-5-5-in-the-model-selector>)

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Canonical source: https://creatorstoolbox.com/blog/replit-claude-haiku-5-5-in-the-model-selector