Google Ships Gemini 4 Carbon Targeting Long-Horizon Agent Tasks

GREG ISENBERG (@gregisenberg) · 2026-11-10 16

i've been testing gemini 4 carbon for 7 days. some early observations:

1/ it stopped cheating mostly. successful shortcuts on terminal-bench went to 0.0% (you can finally leave an agent alone mostly)

2/ prompt injection attack success rate was 0.0% on gray swan's benchmark. that's the number that lets you hand an agent your inbox

3/ it doesn't quit. google's own teams have watched it work on one problem for days and push through dead ends (love to see it)

4/ when it's stuck, it tells you what it still needs instead of making something up. unsupported claims got cut in half vs argon

5/ it does what you asked. not more, not less (overreach down 26%, under-delivering down 29%)

6/ it writes secure code at 2x the rate of argon. vibe coded apps keep getting hacked, so this one matters

7/ it found 88% of the vulnerabilities on sec-bench pro. every small company is about to have a security team it never hired

8/ $2 in and $10 out per million tokens to start, with cached input 95% off. agents that run for days just got cheap enough to actually run for days

9/ google shipped this two weeks after argon. pretty amazing pace

10/ cyber defenders got it first. very interesting

maybe i should do a full carbon vs fable 5.2 comparison on @startupideaspod. crazy ai launch week and it's only tuesday. i wonder what openai has in store. Also the week with the whole Jensen affair.

what a week in ai land

↳ 引用 @sundarpichai (Sundar Pichai): Gemini 4 Carbon is rolling out today. It’s built for sustained, long-horizon tasks, reasoning deeply through complex software engineering, cybersecurity, and scientific discovery.

Coming globally via the Gemini API in @GoogleAIStudio and Gemini for business, and for Ultra subscribers in @antigravity, the @GeminiApp, and AI Mode in Search.