Google pairs Hydrogen with Carbon for coding and replanning
Google launched Hydrogen and began rolling out Antigravity Orchestrator, which switches between Hydrogen and Carbon as a coding task changes.
Google launched Hydrogen in the Gemini API on November 12 and began rolling out Antigravity Orchestrator.
In the Carbon version, Carbon can inspect a repository and form a plan; Hydrogen writes code and runs tests. When execution reveals a problem, the session can return to Carbon to revise the plan before Hydrogen continues. This changes model selection during a task instead of fixing it from the opening prompt. [1][3]
Hydrogen is rolling out to paid Google AI Pro and Ultra subscribers. Current Antigravity documentation lists Orchestrator (Carbon) and Orchestrator (Argon) for Ultra, and Orchestrator (Argon) for paid Pro. Availability may vary during rollout. The Carbon mechanism illustrated here is one of those options, not a feature promised to every Pro account. [3]
The standard paid API rate is $1.50 per million input tokens and $7.50 per million output tokens, including thinking; implicit cached input is $0.075 per million. A free API tier is also available. API prices are separate from Antigravity subscription quota. [1][2][5]
For an existing Ultra subscriber, the immediate trial is a bounded repository change with a known acceptance test. Compare Orchestrator (Carbon) with Carbon alone on that task, including repairs and review time. The release makes adaptive routing available; it does not yet establish an independent reliability or completed-task cost advantage.
Take it further
Check Orchestrator access Rolling out: Carbon and Argon variants for Ultra; Argon variant for paid Pro. API charges are separate.
Sources & details 5 sources
Discuss in your voice app
Take the reporting, visual explanations and original sources into a conversation. Copy the brief, paste it into your preferred assistant, then start its voice mode.
Paste the brief into your voice app to discuss this reporting.Revised 12 November 2026. Revised visual explanations and copy; added Nvidia investigation context and clarified tool eligibility.
Reporting sources
- Google — Gemini API changelog
November 12 general availability and supported thinking levels.
- Google — Gemini API pricing
Standard paid rates; output includes thinking. API billing is separate from subscription quota.
- Google — Hydrogen in Antigravity
November 12 rollout, dynamic bidirectional model handoffs, plan eligibility and provider benchmark.
- Google — Enterprise Agent Platform release notes
November 12 Hydrogen lifecycle and unified context; short-term release with minimum45-day retirement notice.
- Google — Introducing Hydrogen
Distinct November 12 launch confirms API pricing, Pro/Ultra access and dynamic Orchestrator switching. Benchmark-version wording conflicts with the Antigravity post, so the efficiency figures are omitted.
Images & figures
Worked example: a failed price test sends execution back to planning; Carbon makes the cents contract explicit, then Hydrogen changes the stored value and reruns the assertion.
Euangelion · Source · Usage terms · Download figure