Bypassing Antigravity's Claude Opus 5.5 Restriction on Jio Promotional Google AI Pro Accounts

A workaround utilizing Google Family Sharing has emerged for developers in India using the 18-month Google AI Pro subscription bundled with Reliance Jio's unlimited 5G promotion, enabling access to Anthropic's newly added Claude Opus 5.5 and Claude Sonnet 5.5 reasoning models inside Google's Antigravity coding environment.

Image source: Kunal (@kunal_twts) / X

Shared on X (formerly Twitter) by Kunal (@kunal_twts), the tip circumvents partner-tier restriction flags that prevent promotional Google AI Pro accounts from seeing the latest Claude 5.5 models in Antigravity's picker interface.

Root Cause: Promotional and Bundle Flags on the Google Backend

In early October 2026, Google quietly integrated Anthropic's Claude Opus 5.5 (thinking) and Claude Sonnet 5.5 (thinking) into Google Antigravity.

However, according to official Antigravity model documentation and staff clarifications on the Google AI Developers Forum, the Claude 5.5 family is restricted to non-trial, direct-billing Google AI Pro and Google AI Ultra subscriptions. Subscriptions activated through carrier bundles (such as Reliance Jio in India), student offers, or partner promotions are classified as 'promotional/trial' tiers on the backend.

As a result, primary accounts redeemed through the Jio 18-month offer cannot see Claude Opus 5.5 or Sonnet 5.5 in the model picker. Instead, they are restricted to legacy options—Claude Opus 4.6, Claude Sonnet 4.6, and GPT-OSS 120B—all of which are marked with sunset notices scheduled for removal on November 2, 2026.

The Workaround: Inheriting Pro Entitlements via Google Family Sharing

Kunal (@kunal_twts) verified that secondary accounts added through Google One's Family Sharing inherit the Pro feature set without inheriting the backend promotional carrier restriction flag.

1. Set Up Family Sharing: From the primary Google account that redeemed the 18-month Jio Google AI Pro offer, configure a Google Family Group.
2. Invite a Secondary Account: Send an invitation to your secondary Google account and accept the shared Google One benefits.
3. Log In to Antigravity: Launch the Antigravity desktop client and sign in using the secondary Google account rather than the primary Jio-linked account.
4. Access Claude 5.5 Models: Open the model selector; Claude Opus 5.5 and Claude Sonnet 5.5 will now appear and can be selected for coding sessions.

Caveats: Shared Quotas and Aggressive Burn Rates

While the workaround bypasses the model picker restriction, significant quota constraints apply. Key caveats highlighted by the author and community replies include:

• Potential Shared Quotas: Community replies (such as @harishphk) pointed out that accounts added via Google Family Sharing likely share the master subscription's quota pool rather than receiving separate independent allowances.
• 5-Hour Rolling Limit: The author noted that he burned through his 5-hour limit while using Opus 5.5 on the secondary account.
• Weekly Quota Drawdown: A community reply (@pohawaalaa) noted that sending as few as three messages with Opus 5.5 (high model) consumed roughly 50% of the weekly allowance, with the author acknowledging that the model must be used sparingly.
• Longevity Uncertain: Because this approach relies on an omission in backend flag synchronization across family member accounts, Google could patch the entitlement inheritance logic at any time.

Developers utilizing this bypass should reserve Claude Opus 5.5 for high-complexity architectural design and challenging debugging tasks, rather than routine queries.

Original source

• Kunal (@kunal_twts) on X: Tip if you're trying to use Opus 5.5 or Sonnet 5.5 on the free Gemini Pro from Jio
• Google AI Developers Forum: Does a Jio-provided Google AI Pro plan count as "non-trial" for Claude 5.5 access in Antigravity?
• Google AI Developers Forum: Claude Opus 5.5 and Sonnet 5.5 not appearing in model picker — Google AI Pro