# Claude Opus 4.6 is no longer available. Please switch to Claude Opus 5.5

**URL:** <https://discuss.ai.google.dev/t/claude-opus-4-6-is-no-longer-available-please-switch-to-claude-opus-5-5/190580>\
**Category:** Google Antigravity\
**Tags:** models\
**Created:** [October 19, 2026, 2:27am UTC](https://discuss.ai.google.dev/t/claude-opus-4-6-is-no-longer-available-please-switch-to-claude-opus-5-5/190580 "2026-10-19T02:27:16Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Randy3](https://d1dlmcr85iqnpo.cloudfront.net/user_avatar/discuss.ai.google.dev/randy3/32/147508_2.png) [@Randy3](https://discuss.ai.google.dev/u/Randy3)\
**Post date:** [October 19, 2026, 2:27am UTC](https://discuss.ai.google.dev/t/claude-opus-4-6-is-no-longer-available-please-switch-to-claude-opus-5-5/190580/1 "2026-10-19T02:27:16Z")

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After using up my OPUS 5.5 quota on my main Pro account, I switched to a free account to use OPUS 4.6.  
I got the message: “Claude Opus 4.6 is no longer available. Please switch to Claude Opus 5.5.”  
Does anyone know how to fix this?

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**Author:** ![Ambati\_Rajendra](https://d1dlmcr85iqnpo.cloudfront.net/user_avatar/discuss.ai.google.dev/ambati_rajendra/32/31584_2.png) [@Ambati\_Rajendra](https://discuss.ai.google.dev/u/Ambati_Rajendra)\
**Post date:** [October 19, 2026, 12:20pm UTC](https://discuss.ai.google.dev/t/claude-opus-4-6-is-no-longer-available-please-switch-to-claude-opus-5-5/190580/2 "2026-10-19T12:20:03Z")

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Hi @Randy3,

Thanks for reaching out! That message happens because your window or active chat thread is still holding onto cached model routing from your Pro account after you switched to your Free account.

Per [Choose a model | Google Antigravity Docs](https://antigravity.google/docs/models), **Claude Opus 5.5 (thinking)** is only for paid Pro/Ultra plans, while **Claude Opus 4.6 (thinking)** is still available on Free accounts until **November 2, 2026**.

To fix this on your Free account:

1. Open the Command Palette (`Ctrl+Shift+P` / `Cmd+Shift+P`) and run **`Antigravity: Reset Onboarding`** to clear the cached Pro session and sign in cleanly with your Free account.
2. Start a **New Chat** (`Ctrl+N` / `Cmd+N`) rather than continuing the Opus 5.5 thread, then select **Claude Opus 4.6 (thinking)**, **Claude Sonnet 4.6 (thinking)**, or **Gemini 3.8 Flash**.

Also, if you want to stay on your main Pro account without waiting for the 5-hour quota refresh ([Plans | Google Antigravity Docs](https://antigravity.google/docs/plans)), you can switch to **Claude Sonnet 5.5 (thinking)** or **Gemini 3.8 Flash** , or turn on **AI Credit Overages → Always** in Settings ([Plans | Google Antigravity Docs](https://antigravity.google/docs/plans/#overages)).