Gemini 4 Pro / Flash: benchmarks, hands-on tests and leaks

Google is removing older models such as Gemini 3.6 and 3.7 Flash from Antigravity, which users read as a sign that Gemini 4 Argon and other new models are coming soon.

A Turkish post says Google will release Gemini 4 Argon in September 2026 with a 1 million token output limit, alongside Googlebook hardware and a cybersecurity-focused 3.8 Flash Cyber model.

A user jokes that the wait for the delayed Gemini 4 Argon has turned the codename into "Gemini 4 Agony."

A user notes that Fast mode has disappeared from the Flash models in the model selector and that Gemini 3.6 and 3.7 Flash are set to be deprecated soon, possibly today, suggesting the Gemini 4 Argon rollout is close.

StatsWire rebuts a comparison chart, saying Gemini 4 Argon actually ranks 10th and that the other side compared against old Opus 4.8 rather than 5.5.

On the same prompt, Gemini 4 Argon builds a 71,700-voxel sakura pagoda scene running at 165 FPS with an interactive UI and four lighting modes, compared in one video against Gemini 3.1 and 2.5 Deep Think.

A post claims Google scrapped 3.5 Pro entirely after repeated delays and will launch Argon on September 30 at $2/$10 per million tokens with a 1M output limit, matching GPT-6 Astra and Opus on coding and cyber benchmarks.

The poster says Argon's rollout is imminent, notes complaints about thin usage limits on non-Gemini models, and says they will run benchmarks and hands-on tests as they did with 3.8 Flash.

A developer account says several Antigravity updates launched today and hints that Gemini 4 Argon is coming soon.

Reports say Gemini 4 Argon is being tested with a wider group, and the poster thinks a full release may not be far off.

Google announced Gemini 4 Argon but is not making it broadly available yet, starting with trusted cyber defenders while it works on misuse, prompt injection and agent-control safeguards.

Antigravity has added Claude Opus 5.5 and Sonnet 5.5 for all paid users, and says it is excited for a broader rollout of Gemini 4 Argon.