Gemini 4 Carbon is generally available at Argon's price

Google made Gemini 4 Carbon available through the API in Google AI Studio and Gemini for business for all paying developers and enterprises, at the same introductory price as Gemini 4 Argon: $2 per million input tokens and $10 per million output tokens. Google says Argon remains the choice for most software engineering work, and that Carbon is for complex multi-step coding and debugging, using more tokens than Argon "to explore thoroughly, reason deeply, and run extended verification loops." Google also previewed /swarm in Google Antigravity, which turns a single prompt into a coordinated team of agents: Carbon takes architecture, coordination and auditing roles, lighter models work in parallel isolated workspaces, and "adversarial verifiers" test every change. Benchmark rankings and partner results in the post are Google's and its partners'; HubX, for one, reported a 94% resolution rate with zero regressions across 16 bug fixes in a 14,000-test codebase. The Hacker News thread stood at 269 points and 146 comments at about 19:00 EST.

Why it matters: With the per-token price the same, the difference between Argon and Carbon is how many tokens each spends on a task, and Google says Carbon spends more. A team on Gemini can route only its hardest planning and review steps to Carbon and compare cost per completed task on its own work before changing the default.