Google has fully opened its flagship Gemini 4 Carbon worldwide: paid API, enterprise, and Google AI Ultra users can run it in AI Studio, the Gemini app, and Antigravity. Reports say Carbon previously hit 59 on the Artificial Analysis Intelligence Index, topped several production benches against Fable 5.2, Opus 5.5, and GPT-6-class models, and now ships with /swarm multi-agent mode plus six months of free top-tier access for about 10,000 scientists.
Benchmarks and pricing
About two weeks ago we covered Carbon’s 59-point Intelligence Index lead when broad access was still closed. With today’s unlock, coverage cites 96.2% on GraphWalks and first place on CursorBench 4.0, Perplexity WANDR, and Zapier, ahead of rivals including Anthropic’s Fable 5.2.
Quoted pricing: about $2 per million input tokens and $10 per million output, with roughly 95% cache discounts, described as GPT-6.1 Sol–class launch pricing. Other cited scores include MKA 54.3% (global #2), a KillSwitch-Bench tie for #1 with Fable 5.2, a Balyasny finance research win, and a Wiz case finding real zero-days in under two hours—treat third-party claims as reported, pending independent retests.
/swarm: overnight multi-agent crews
On Antigravity, /swarm is pitched as a multi-agent entry point: one prompt spins up a crew that can run for hours. Paired with DeepMind’s AlphaProof Code, reports claim the swarm produced about 6.5 million lines of proofs in four weeks to verify compiled Signal crypto-related code—an ambitious formal-methods claim that needs independent scrutiny.
Demos include 3D reconstruction of the Apollo lunar module from vintage photos/drawings, rebuilding Google’s Platform 37 office (said to involve 7 documents and 206 drawings), plus open-world toys, fortepiano mechanics, and fabric-mechanics sims—“prompt before sleep, review in the morning.” Scale alone is not enough; our note on SwarmEvolve’s latent multi-agent search makes the same point: collaboration and acceptance decide whether swarms actually accelerate work.
Free seats for 10,000 scientists
Google says it will give roughly 10,000 leading scientists six months of free top-tier access across physics, chemistry, biology, materials, and climate—aimed at hypotheses once shelved as too hard. Coverage also cites a CASP17 case where related tooling raised hard viral-protein homolog retrieval about 40×. For labs, the unlock is less a chat window than long-running agent quota for proofs and simulation.
FAQ
Q: Who can use Gemini 4 Carbon now? A: Per the reported rollout, paid API developers, enterprises, and Google AI Ultra users via AI Studio, Gemini, and Antigravity.
Q: How is /swarm different from a normal chat? A: It is described as a multi-agent swarm for long parallel jobs; results still hinge on task split, permissions, and human acceptance—not raw agent count.
Q: Is it cheap relative to rivals? A: Reported list pricing is about $2 / $10 per million tokens with deep cache discounts; “half the cost of #2” claims should be checked against your own task bills.
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