News and changelog
A dated log of official publications and of updates to this unofficial site. New rows will be added when official documents change. We do not treat rumors as announcements.
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14 Nov 2026
Original same-prompt tests published
We ran six original prompts once each on Gemini 4 Hydrogen, Gemini 3.8 Flash, and Gemma 4 31B on the API free tier, and published playable outputs with wall time, tokens, and equivalent paid-tier cost. Gemini 3.8 Flash returned no outputs this session (HTTP 503 high demand, including one extra attempt). Gemma 4 31B failed only on the four-stroke engine explainer (HTTP 500 twice). A floor-plan-from-video test was not run, to conserve the free-tier budget. These runs are not a benchmark. Read the tests.
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13 Nov 2026
This unofficial site launches
The Hydrogen Brief publishes an English and Chinese briefing on Gemini 4 Hydrogen, restating official access, pricing, and the DeepMind model-card table, with sources retrieved the same day. No independent benchmarks are included.
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12 Nov 2026
Google announces Gemini 4 Hydrogen
Koray Kavukcuoglu’s post introduces Hydrogen for everyday coding and agentic workflows, quotes $1.50 / $7.50 flat pricing and a 1 million-token context window, and lists a global rollout across AI Studio, the Gemini API, Gemini for business, the Gemini app, Search, and paid Antigravity subscribers. Related official posts cover developers, Search, Antigravity Orchestrator, the DeepMind model card, and API / Cloud documentation. Source: Google Blog, 12 November 2026
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10 Nov 2026
Gemini 4 Carbon becomes available
Google’s Carbon announcement, two days earlier, is the immediate predecessor in the Gemini 4 family. Hydrogen’s model card later says Hydrogen is adapted from Carbon. Source: Google Blog, 10 November 2026