Google delays Gemini 3.5 Pro general availability to July amid feedback on long-horizon tasks

What happened

Google has pushed the planned GA release of Gemini 3.5 Pro by several weeks — from June to July 2026. The company declined to comment officially, but sources cite tester feedback on token efficiency and long-horizon agentic task performance.

Context and impact

The delay lands at a sensitive moment — Google has lost several senior researchers in the last month, including John Jumper to Anthropic. The parallel rollout of Computer Use in Gemini 3.5 Flash suggests Google is leading with the smaller/faster model first. A mid-July Pro launch puts Gemini Pro head-to-head with GPT-5.6 and Claude Opus 4.7.

Details

• Original target: GA in June 2026
• New target: July 2026
• Reason: token efficiency + long-horizon tasks
• Co-occurring: Computer Use in Gemini 3.5 Flash entering preview now
• Google spokesperson "declined to comment"