Claude Opus 5.5 in Antigravity: Access, Limits & How to Enable

Update (9 Nov 2026): Claude Fable 5.2 and Mythos 5.2 are out - prices, access and benchmarks are in my Claude Fable 5.2 guide.

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Google is adding two of Anthropic’s latest models to Antigravity, its AI-powered coding editor: Claude Opus 5.5 and Claude Sonnet 5.5. Only paying subscribers to Google AI Pro and Google AI Ultra will get access. If you have Pro through a promotion, discount, or trial period, you’ll stay on the older 4.6 models. Here’s exactly who gets access, what the limits are, and what’s being removed on November 2nd.

Who Gets Claude 5.5 in Antigravity

Important Note for Pro Users with Vouchers or Promotions

This is the most important information in this article if you purchased Google AI Pro at a discount. According to reports, Pro obtained through a promotion, discount, or trial period does not grant access to Claude 5.5 models. This also applies to annual and 18-month promotional offers. Gemini 3.1 Pro, Flash, and other Pro features work normally in such plans, but in Antigravity you’ll stay on Claude 4.6 until November 2nd. If Claude 5.5 in Antigravity is your main reason for subscribing, check the model selector before canceling another subscription.

How to Enable Claude Opus 5.5 in Antigravity

1. Update Antigravity to the latest version (Antigravity menu, check for updates).
2. Sign in with the Google account that has paid Google AI Pro or Ultra.
3. Open a new conversation and click the model name below the input field (default is “Gemini 3.1 Pro High”).
4. Select “Claude Opus 5.5 (Thinking)” or “Claude Sonnet 5.5 (Thinking)”. If you don’t see them and instead see Claude 4.6 with a “Notice” label, your account hasn’t received the rollout yet or your plan doesn’t qualify for access.
5. In the same menu, “View Usage” shows two separate counters: one for Gemini models and one for Claude and GPT models.

Limits: Separate Pool for Claude

Antigravity counts limits in five-hour and weekly windows. Gemini models have a shared pool billed according to API prices. Third-party models, meaning Claude and GPT-OSS, have a separate, fixed limit because Google has limited compute capacity for them. In practice, this means:

• exhausting the Claude limit doesn’t block work on Gemini and vice versa;
• Ultra has five times the Pro limit, and the higher Ultra tier has twenty times the limit;
• after exhausting the limit, Pro and Ultra users can purchase AI credits, which then work only as a top-up beyond the plan.

Google doesn’t provide the limit in number of messages, so we’re not listing numbers that can’t be verified. Opus 5.5 in thinking mode consumes the pool faster than Sonnet, so for simple tasks it’s better to switch to Sonnet.

Opus 5.5 vs Sonnet 5.5 for Coding

More about the model itself, its pricing, and our tests in the Claude Opus 5.5 guide and the article about Claude Sonnet 5.5.

What’s Being Removed November 2, 2026

• Claude Opus 4.6 (thinking)
• Claude Sonnet 4.6 (thinking)
• GPT-OSS-120B

Gemini 3.8 Flash, 3.7 Flash, 3.6 Flash, and 3.1 Pro remain in all plans with no removal date. For Free and AI Plus plans, this means that from November 2nd there will be no Claude models in Antigravity.

Is This Worth It Instead of Claude Pro

Google AI Pro and Claude Pro cost roughly the same amount. For a similar price, Google gives you Gemini, 5 TB of storage, and now Claude 5.5 in the editor. Claude Pro gives you the full Claude app, Claude Code, and greater control over limits. We made a detailed comparison in a separate article: Claude through Google AI Pro - is it cheaper access.

Frequently Asked Questions

Is Claude Opus 5.5 in Antigravity free?

No. It only works in paid Google AI Pro and Ultra. The free plan and AI Plus stay on Claude 4.6, which will be removed on November 2, 2026.

Do I need an Anthropic API key?

No. Billing goes through your Google subscription, you don’t pay Anthropic separately.

Why don’t I see Claude 5.5 despite having a Pro plan?

There are three reasons: the rollout is happening in waves, your Pro comes from a promotion or trial period, or you have an old version of Antigravity. Update the app and check the model selector again in a few days.

Is Claude 5.5 also in the Gemini app?

No. The change only affects Antigravity. In the Gemini app, limits are changing on October 9th, which we cover in the article Gemini free from October 9th.

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Sources and Verification Date

• NPowerUser: Claude 5.5 in Antigravity and new Gemini limits
• Startup Fortune: Antigravity adds Opus 5.5 and Sonnet 5.5
• Antigravity: official model list
• Antigravity: changes to plans and limits

Verified October 3, 2026. We’ll update this article when Google publishes an official announcement.

Kinetyra