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

The author rounds up a busy October: OpenAI DevDay, Sonnet 5.5, Gemini 4 Pro checkpoints appearing and disappearing on Arena, Fable 5.5, Haiku 5.5 and Astra 6.1 rumors.

The author says a model listed on Arena as "Gemini 3.8 Flash" runs nearly twice as fast as current flagships, shows the strongest visual and product taste, and handles 3D detail more densely.

A user jokes that Anthropic saw Opus 5.5 take the lead and casually pushed out Sonnet 5.5 too, while Gemini 4 Pro is still nowhere in sight.

The video's author says the model listed on Arena as 3.8 Flash is actually Gemini 4 Pro, beating existing models with only Opus 5.5 keeping pace, and running faster than current frontiers.

The author had hoped to test Gemini 4 Pro this week, but the gemini 3.8 checkpoint in Arena, suspected to route to 4 Pro, has been removed, so they must wait for a new checkpoint.

The author used Gemini 4 Pro to generate and render a 3D celebration scene of the Android robot cutting a birthday cake, calling the prompt-to-3D capability impressive.

After reading a Gemini 4 Pro review, the poster finds it fairly credible but says the overall results fall below their original expectations.

A post asks whether Claude and Codex users would move to Antigravity if Google releases Gemini 4 Pro and it beats both Opus 5.5 and GPT-6 Astra.

A test video shows Gemini 4 Pro generating a copper-piped cosmic coffee machine, complete with a very long robot arm that exists only to drop in a sugar cube.

Given the same creative brief, Astra produced a polished interactive experience while Gemini 4 Pro made a documentary-style piece with timestamps, narration and its own soundtrack, which the author calls closer to directing than prompting.

A commenter says the upgrade finally feels noticeable and that pairing Gemini 4 Pro with Opus 5.5 would be perfect, hoping it ships soon.

A short Japanese post expressing strong anticipation for Gemini 4 Pro, with no hands-on testing or leak information.