Google Antigravity Adds Claude 5.5 to Paid Tiers
Google Antigravity's model documentation lists Claude Sonnet 5.5 (thinking) and Claude Opus 5.5 (thinking) for eligible Google AI Pro and Google AI Ultra subscribers. The page excludes Free, Google AI Plus, and Enterprise accounts, and says Pro access requires a non-trial subscription. It also schedules the listed Claude 4.6 models and GPT-OSS-120B for removal on November 2, 2026.
Google Antigravity's model documentation lists Claude Sonnet 5.5 (thinking) and Claude Opus 5.5 (thinking) as reasoning-model options for eligible Google AI Pro and Google AI Ultra subscribers. The October 3 documentation check shows that Google AI Pro access is limited to non-trial subscriptions.
Free, Google AI Plus, and Enterprise accounts are not listed as eligible for either Claude 5.5 model. That makes the availability matrix narrower than a simple paid-versus-free split: Enterprise is excluded, and a promotional or trial Pro entitlement does not meet the stated Pro condition.
Model access and removals
The same model page lists Gemini 3.8 Flash, Gemini 3.7 Flash, Gemini 3.6 Flash, and Gemini 3.1 Pro across all displayed plan categories. It separately marks Claude Sonnet 4.6, Claude Opus 4.6, and GPT-OSS-120B for removal on November 2, 2026.
The listed Claude 4.6 models are currently available to Free, Plus, and Pro users, but not to Ultra or Enterprise users. GPT-OSS-120B is listed for Free, Plus, Pro, and Ultra, but not Enterprise. Antigravity's documentation also says that a reasoning-model selection persists within a conversation; changing it while an agent is running does not change the model used for that active turn.
What developers should record
For teams comparing Antigravity runs across accounts, the documented access matrix makes the selected model and subscription eligibility part of the test context. A result produced with an eligible Claude 5.5 entitlement may not be reproducible on a Free, Plus, trial-Pro, or Enterprise account. The November 2 removal date also gives users of the listed older models a concrete point to recheck their workflows and model selection.
Key Points
- 1Antigravity lists Claude Sonnet 5.5 and Opus 5.5 for Google AI Ultra and eligible non-trial Google AI Pro subscriptions.
- 2Free, Google AI Plus, and Enterprise accounts are not listed as eligible for the Claude 5.5 models.
- 3The documentation marks Claude 4.6 variants and GPT-OSS-120B for removal on November 2, 2026.
Scoring Rationale
The update changes documented model availability and a retirement timeline in a developer-facing agent platform. It is relevant to practitioners using or evaluating Antigravity, but the retrieved evidence does not establish an API or model-capability release.
Sources
Primary source and supporting public references used for this report.
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