Google announces Gemini 4 Carbon two weeks after Argon

Google announced Gemini 4 Carbon on 28 October, two weeks after the launch of Gemini 4 Argon. The company said the new model makes large gains in coding, agentic tasks and cyber defence, and that it ranks first on version 5.0 of the Artificial Analysis Intelligence Index with a score of 59. On the security benchmarks Google cited, Carbon scored 88.2% on SEC-bench Pro for finding vulnerabilities, 54.8% on ExploitGym and 71.0% on CWE-bench for patching.

Google also reported behavioural changes from its internal testing: about half as many unsupported claims as Argon, 26% less overreach and 29% less under-service on multi-step plans. These are the company’s own measurements and have not been independently reproduced.

The model goes first to cyber defenders this week, then to developers, businesses and consumers. Introductory pricing is $2 per million input tokens and $10 per million output tokens, rising later to $4 and $20.