Google made Gemini 4 Carbon, which it calls its strongest model, available via the API in Google AI Studio and Gemini for business for all paying developers and enterprises. It is also rolling out to Google AI Ultra subscribers in Google Antigravity, the Gemini app and AI Mode in Search. Google first released Carbon to cybersecurity defenders through its Fairwind Program two weeks earlier, and says Gemini 4 Argon remains the right choice for most software engineering and knowledge work.
Carbon carries the same introductory price as Argon: $2 per million input tokens and $10 per million output tokens. The Verge reported that this is about a fifth of the cost of OpenAI's GPT-6 Astra and a quarter of Anthropic's Fable 5.2, and that prices double at the end of November. The Verge noted that per-token price does not necessarily mean lower costs, since models use different numbers of tokens for the same task, and said it is not clear when or if lower tiers or free users will get Carbon.
Google says Carbon ranks #1 on CursorBench 4.0, Perplexity's WANDR and Zapier's AutomationBench at more than 2x lower cost per task than the next best external model. The Verge said benchmarks suggest Carbon trails only Fable 5.2 on most metrics, while cautioning that companies cherry-pick results. Google is also previewing /swarm in Antigravity, which turns a single prompt into a coordinated team of agents, and showed Carbon reimagining the Google Merchandise Store in two prompts.
On security, Google says Carbon reached a 0% attack success rate on the Gray Swan indirect prompt injection benchmark, while acknowledging that prompt injection robustness still needs work.