Google opens Gemini 4 Carbon to all and adds the faster Hydrogen

Google has filled out its Gemini 4 family in two steps this week. On November 10 it made Gemini 4 Carbon generally available to developers, enterprises and Google AI Ultra subscribers, two weeks after announcing it and handing it first to a group of cyber defenders through its Fairwind Program. Carbon is Google's strongest model, built for long-horizon coding, cybersecurity and scientific work, and Google reports it ranked first on the Artificial Analysis Intelligence Index (59) at launch and leads SEC-bench Pro (88.2%), ExploitGym (54.8%) and CWE-bench (71.0%). It costs $2 per million input tokens and $10 per million output tokens, the same as Gemini 4 Argon, and arrives with a /swarm preview in Google Antigravity that splits one prompt across a team of agents.

On November 12 Google followed with Gemini 4 Hydrogen, a fast execution model for everyday coding and agent work. Google says it edges past Argon on the Artificial Analysis index at its default thinking level (51 vs. 50, 54 at its highest setting), finishes tasks 2.5 times faster than Gemini 3.8 Flash and more than triples its Terminal-Bench 4.1 score (57% vs. 18.2%). Hydrogen is priced at $1.50 and $7.50 per million input and output tokens across a 1-million-token context, and it is the version that brings Gemini 4 to every tier: AI Studio, the Gemini API, the Gemini app and Search. A new Orchestrator in Antigravity switches between Carbon and Hydrogen within a session; on Terminal-Bench 4.0 Google reports near-Carbon success with 24% less quota.