Antigravity keeps Claude on free accounts until November 18, not November 2

What changes on November 18

Google’s Antigravity models page marks three models with the same footnote: “Will be removed on November 18, 2026.” They are Claude Sonnet 4.6, Claude Opus 4.6 and GPT-OSS-120b. Until this week the footnote read “Will be removed on November 2, 2026”; by November 3, Google had moved it to November 18, without a note, and its changelog doesn’t mention the change. Google hasn’t announced replacements for them, and the page doesn’t say what happens to work that was using them.

Here is Claude in Antigravity, plan by plan, as Google’s table reads today:

Model	Free and AI Plus	AI Pro trial	AI Pro	Ultra
Claude Opus 4.6	Until Nov 18	Until Nov 18	Until Nov 18	No
Claude Sonnet 4.6	Until Nov 18	Until Nov 18	Until Nov 18	No
Claude Opus 5.5	No	No	Yes	Yes
Claude Sonnet 5.5	No	No	Yes	Yes
GPT-OSS-120b	Until Nov 18	Until Nov 18	Until Nov 18	Until Nov 18

Enterprise has the 5.5 models and never had 4.6. On Free and Google AI Plus, the removals leave Gemini 3.8 Flash and, by the models table, Gemini 4 Hydrogen, which Google released on November 12. Google’s announcement, though, brings Hydrogen to Antigravity for “paid Google AI Pro and Ultra subscribers,” and hasn’t explained the difference, as our memo on Hydrogen sets out. Gemini 4 Argon needs Pro, Ultra or Enterprise, and Gemini 4 Carbon, in Antigravity since November 10, needs Ultra or Enterprise.

Who keeps Claude, and who loses it

You lose Claude if you use Antigravity on the free plan, on Google AI Plus, or on Google AI Pro’s free trial. Each of them has Claude only through the 4.6 models, and the 5.5 models aren’t offered to them.

You keep Claude on a paid Google AI Pro subscription, on Ultra, and on Enterprise. Those accounts get Claude Sonnet 5.5 and Opus 5.5, and on Pro and Ultra you can buy AI credits for use beyond the plan’s quota.

The trial is the part that catches people out. Google’s footnote on the 5.5 models reads “Available on Google AI Pro for non-trial subscriptions only,” so starting a Pro trial now doesn’t keep Claude in your model picker after November 18.

Quotas differ too. Google’s plans page gives the free tiers “a meaningful quota, refreshed weekly,” while Pro’s is “refreshed every five hours until the weekly limit is reached” and Ultra’s is “the highest, most generous quota, refreshed every five hours.”

Three ways to keep using Claude

1. Pay for Google AI Pro. Upgrade from Free, or end the trial early and become a paying subscriber, and Antigravity offers Sonnet 5.5 and Opus 5.5 in its model picker. It’s the simplest path if Antigravity is where you already work.
2. Use Claude Code on a Claude plan. Claude Code is Anthropic’s own agent. It’s included with Claude’s Pro, Max and Ultra plans (not the free plan), runs Anthropic’s current models, and its limits are Anthropic’s rather than Google’s. You lose Antigravity’s Gemini models and Google integrations, unless you keep both.
3. Keep both, in one app. Enjoy runs Antigravity and Claude Code side by side, each signed in to the account you already have: Antigravity on your Google account, Claude Code on your Claude plan. Give a job to Gemini, hand it to Claude when it needs Claude, and the conversation comes with it. Enjoy is a monthly subscription, with the first seven days free (pricing). You still need a Claude plan for Claude Code; Enjoy doesn’t add Claude to a Google account. Google’s FAQ, as we read it on November 3, says “Wrapping agy inside third-party coding agents or applications, or automating account rotation, is not supported under consumer plans,” and its terms say using “third party software, tools, or services to access the Service” “may be grounds for suspension or termination.” Enjoy now runs Antigravity through the server Google offers “for Xcode, JetBrains IDEs, Zed, and custom ACP clients,” as its changelog puts it, rather than wrapping agy.

What to do before November 18

• Finish or wrap up work that depends on Claude 4.6. If a long-running conversation is mid-task on Sonnet 4.6 or Opus 4.6, get it to a stopping point, and note where it was in a file the next model can read.
• Choose your replacement now. Try Gemini 3.8 Flash, or Gemini 4 Hydrogen if your model picker has it, on a real task this week, so you know whether it covers your work before you have no choice.
• Decide on Pro deliberately. If you upgrade for Claude, upgrade to a paid subscription, not a trial.
• If you use GPT-OSS-120b, plan for it too. It leaves every plan that has it on the same day, and Google hasn’t said when OpenAI’s models will arrive.

We’ll update this memo if Google changes its models page again before November 18.