Claude Opus 4.6 on Antigravity: Full Upgrade or a Limited Release? A First Look for Pro Users

# Claude Opus 4.6 on Antigravity: Full Upgrade or a Limited Release? A First Look for Pro Users ## Claude Opus 4.6 Arrives on Google AI IDE Antigravity: Everything You Need to Know The highly anticipated Claude Opus 4.6 model is finally live on Google's AI IDE platform, Antigravity! This update brings new possibilities but also raises some important questions. This video breaks down the key details of this new release. ### 🚀 Rollout Details & Quota System - **Tiered Rollout**: As is common, users on the Ultra plan get access to the new model 1-2 days earlier than Pro plan users. - **Model Replacement**: Currently, both Opus 4.5 and 4.6 are available. However, it's expected that Opus 4.5 will be phased out and fully replaced by 4.6 soon. - **Migrated Quotas**: Initial tests suggest that Opus 4.5 and 4.6 share a message quota. This means your usage limit likely won't change after switching to 4.6. It's worth noting, however, that quotas for Pro users are inconsistent, varying from 40 to 150 messages for unknown reasons. ### 🤔 The Core Question: Is It the Full Opus 4.6? The biggest point of discussion around this update is that the version of Opus 4.6 on Antigravity appears to be a **limited or \"crippled\" version**. #### The Key Evidence: 200K vs. 1M Context Window Based on a technical test screenshot shared by a community member, we observed: 1. The model is identified as `Opus 4.6 thinking`. 2. Although the model's theoretical context window should be **1M** tokens, the actual test hit its limit when the input exceeded **200K** tokens. This implies that, at least for Pro users, the currently available Opus 4.6 on Antigravity does not offer its advertised 1M ultra-long context capability, remaining at the 200K token level instead. ### 📢 Summary and Outlook In summary, while the launch of Claude Opus 4.6 on Antigravity provides a new model choice, its key feature—the 1M context window—does not seem to be fully available to all users yet. This could be a phased rollout strategy by the platform for stability or cost management reasons. We encourage users on the Ultra plan with the technical ability to test this to share their findings on the 1M context window. Your feedback can help the community get a clearer picture of what this update truly offers.