How to access Gemini 4 Hydrogen

Model identifier

Use gemini-4-hydrogen in Google AI Studio, the Gemini API (GenerateContent and the Interactions API), and Gemini Enterprise Agent Platform. Thinking levels are low, medium, high (default), and xhigh.

Source: Google AI Studio / Gemini API docs, Retrieved 13 November 2026 · Source: Google Cloud documentation, Last updated 12 November 2026

Developers

• Build with the Gemini API in Google AI Studio and Android Studio. Hydrogen is listed on both the free and paid API tiers; the free tier is rate-limited.
• In Google Antigravity, the launch post named paid Google AI Pro and Ultra subscribers; Antigravity’s models documentation (checked 14 November 2026) now lists Hydrogen on Free, Google AI Plus, Pro, Ultra and Enterprise. Orchestrator (Carbon) is listed for Ultra only, and Orchestrator (Argon) for Pro and Ultra. Source: Google Antigravity Docs, checked 14 November 2026
• The Antigravity agent in Gemini Managed Agents now uses gemini-4-hydrogen by default, according to the “What’s new” guide.

Source: Google Blog, 12 November 2026 · Source: Google AI Studio / Gemini API docs, Retrieved 13 November 2026

Enterprises

• Deploy in Gemini for business via the API or the model dropdown, and in Google Antigravity.
• Gemini in Google Sheets is listed for eligible business subscriptions.
• On Agent Platform, the developer guide lists regions global, us, and eu, and notes that Hydrogen is a short-term GA release with a minimum 45-day retirement notice.

Source: Google Blog, 12 November 2026 · Source: Google Cloud documentation, Last updated 12 November 2026

Consumers

• Gemini app: Google says to start using it in the model dropdown. Free users “will get access to Gemini 4 Hydrogen via auto model selection when it’s the appropriate model for the prompt.”
• Google Search: Hydrogen is described as available globally for all users, with changes to intent understanding, query fan-out, visual responses, and language understanding in supported AI Mode languages.
• Gemini in Google Sheets: starting with Google AI Pro and Ultra subscribers.

Source: Google Blog, 12 November 2026 · Source: Google Blog, 12 November 2026

Orchestrator in Antigravity

Antigravity’s 12 November 2026 post says Orchestrator dynamically switches between Carbon and Hydrogen in a single session. Rollout, as written there:

• Gemini 4 Hydrogen: paid Google AI Pro and Ultra subscribers.
• Orchestrator (Carbon) and Orchestrator (Argon): Google AI Ultra subscribers.
• Orchestrator (Argon): paid Google AI Pro subscribers.
• Enterprises can access both in Gemini for business. Additional models and plans are described as coming later.

Source: Google Antigravity Blog, 12 November 2026

Practical API notes (from official docs)

• Sampling parameters temperature, top_p, and top_k are ignored. Control depth with thinking_level.
• Explicit context caching is not supported. Implicit caching applies automatically to shared prefixes of at least 4,096 tokens, with a 95% discount on cached input when it hits ($0.075 / 1M).
• Office and OpenDocument files are accepted in addition to PDF and plain text (Cloud guide).
• For outputs longer than 65,536 tokens, set background to true and raise max_output_tokens, or use client-side continuation. Long decode on Agent Platform requires the v1beta1 API, not v1 — a known issue recorded in the Cloud guide.

Source: Google AI Studio / Gemini API docs, Retrieved 13 November 2026 · Source: Google Cloud documentation, Last updated 12 November 2026

We have not published a worked example from our own account, and we do not provide API keys or a playground on this site.