## Upcoming Shifts in Google’s Antigravity Model Availability
Google has officially updated its Antigravity documentation, signaling a significant transition in the availability of its high-performance reasoning models. As the platform evolves, users should prepare for a streamlined selection of AI tools, with specific sunset dates and subscription-based restrictions coming into play.
### Sunset Dates for Legacy Models
According to the latest technical documentation, a trio of prominent models-Claude Sonnet 4.6, Claude Opus 4.6, and the GPT-OSS-120b-are slated for retirement. Google has confirmed that these specific iterations will be officially removed from the platform on November 2, 2026.
This move reflects a broader industry trend where providers prune older model architectures to focus computational resources on more efficient, next-generation systems. For developers and power users currently relying on these specific versions, it is essential to begin migrating workflows to newer alternatives well before the November deadline to avoid service interruptions.
### Tiered Access: The New Standard for Advanced AI
While some models are being phased out, Google is simultaneously introducing a more rigid structure for its cutting-edge offerings. The latest additions to the lineup-Gemini 4 Argon, Claude Sonnet 5.5, and Claude Opus 5.5-are now subject to stricter access requirements.
These advanced models are exclusively reserved for users with active, paid Google AI Pro subscriptions. Notably, this excludes anyone currently operating on a free Pro trial. This shift suggests that Google is prioritizing its most capable reasoning engines for its committed, long-term subscriber base, effectively creating a “premium-only” tier for its most sophisticated AI capabilities.
### Navigating the Current Model Landscape
When analyzing the full roster of ten reasoning models currently featured on the [official documentation page](https://antigravity.google/docs/models), the landscape is clearly divided. Only a limited subset remains accessible to users on free accounts or those currently testing the waters with a Pro trial.
For instance, Gemini 3.8 Flash remains a primary entry point for those not yet ready to commit to a full subscription. As the platform continues to refine its “Google AI Ultra” tier-which was recently expanded to accommodate growing demand-users should expect further distinctions between entry-level access and professional-grade performance.
