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Artificial intelligence

Carbon reaches Ultra subscribers and paying developers

Google’s November 10 rollout opens Carbon beyond its initial security cohort, with access for paying developers and Ultra subscribers and temporary API pricing of $2 input and $10 output per million tokens.

153 words · 1 min

Carbon’s important change is access.

Following October’s restricted cybersecurity rollout, Google is bringing the model to paying API developers and enterprises, and rolling it out to Google AI Ultra subscribers in the Gemini app, AI Mode in Search and Antigravity. Ultra subscribers can also try it in AI Studio. [1][2]

Google positions Carbon for complex, extended work and retains Argon as its recommendation for most software engineering and knowledge tasks. For a reader already paying for Ultra, the practical experiment is a demanding existing project: give Carbon the evidence and acceptance criteria, then inspect the resulting artifact. Access does not establish reliable autonomy. [1][2]

Public Carbon API access starts at $2 per million input tokens and $10 per million output tokens. After the introductory period expires on November 30, Google lists $4 and $20. The announcement supplies no exact closing time or timezone. Use the regular rates when assessing a workflow you intend to keep. [1]

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Reporting sources

  1. Google — Carbon availability

    November 10 broader rollout, supported access routes, introductory and regular prices. Price expiry is stated as a date without an exact time or timezone.

  2. Google — Carbon for developers

    Paid API availability and Ultra access through AI Studio and Antigravity; provider documentation, not independent capability testing.

  3. Cursor — CursorBench 4.0

    Current evaluator leaderboard checked November 11; compare within this version and harness. A 0.4-percentage-point observed difference does not establish statistical or universal superiority.

  4. Artificial Analysis — Carbon High

    External index result and weighted task-cost estimate using regular $4/$20 prices.

  5. Artificial Analysis — Fable 5.2 Max

    External comparison configuration includes default fallback; this is a different task suite from CursorBench.

Images & figures

  • AI-generated editorial illustration of evidence becoming a coherent structure; a conceptual metaphor, not a product output or documentary image.

    Euangelion · Source · Usage terms

  • Carbon’s introductory token rates are half of its regular rates; the offer expires on November 30, with no exact cutoff time stated.

    Euangelion · Source · Usage terms · Download figure