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

The author argues the next Flash won't be called 4 Flash, that gemini-4-flash-preview was added in June and deleted in August, and gemini-3.8-flash remains the active version.

A short leak mentions gemini 4 carbon and gemini 4 Flash, with no specs, timing, or sourcing.

A Spanish-language video argues Gemini 4 lets non-specialist designers build 3D websites, undercutting agencies that charge around $50K.

A leak claims Gemini 4 Pro is codenamed Argon, Ultra Carbon and Flash Hydrogen, with the whole generation named after elements.

The author explains Google's Fishfood/Teamfood/Dogfood naming tiers and says server configs show Gemini 4 Carbon actively testing at Teamfood stage, alongside a newly exposed Gemini 4 Argon Max Mode variant.

StatsWire checked Google's python-genai SDK git history and found the gemini-4-flash-preview line added June 10 and deleted August 10, absent from main for 2.5 months with no new info today.

A user running Arena tests saw output they thought was Haiku 5.5 but traced it to low-tier Gemini 3.8 Flash, speculating Gemini 4 Flash may already be in Arena.

A user asks which will launch first: Gemini 4 Flash, codenamed Hydrogen, or Fable 5.5.

A user reports Gemini 4 Argon blocked nearly all invalid GPT code reviews, catching 13 erroneous items.

Testing Gemini 4 Argon as it rolls out to all Antigravity users, the author found it refused all 100 black-box hacking labs but built a full 3D cathedral from a single image.

A 48-hour packet-capture test of Gemini 4 Argon finds Pro still at $15/week and Ultra at $50/5h, plus a mid-conversation cache reset that spikes single requests to $0.2–0.3.

The poster calls Gemini 3.8 solid but hopes Flash improves coding and cuts hallucinations, citing its speed and writing strength.