Gemini 4 Hydrogen
Google’s Gemini 4 Hydrogen (gemini-4-hydrogen) is a proprietary multimodal model for fast daily coding and agent workflows, with a 1,048,576-token unified input/output window.
Google’s fast Gemini 4 model for daily coding and agent workflows. The stable API id is gemini-4-hydrogen. It accepts text, image, audio, and video input, returns text, and has a 1,048,576-token context window shared by input and output. Google recommends it as the migration target for Gemini 3.8 Flash.
Why Gemini 4 Hydrogen matters
Google positions Hydrogen as the Gemini 3.8 Flash successor for fast coding and agent workloads. Its published launch benchmarks are vendor claims, not DataAIHub rankings.
Vision · Audio input · Tool calling · Thinking · Coding
Last reviewed: 15 November 2026
When to choose Gemini 4 Hydrogen
Decision guidance for architects—not a feature list.
Best for
- Daily coding and agent workflows
- Gemini 3.8 Flash migrations
- Tool-using multimodal applications
Avoid if
- You need the Live API
- You require open weights
- You cannot validate Gemini 4 migration changes in your production workflow
Strengths
DataAIHub qualitative scores from 1 to 5, for architects. Not official benchmark results or a public ranking.
- Coding / agent speed★★★★★
- Long context★★★★★
- Multimodal input★★★★★
- Open weights★☆☆☆☆
Ecosystem
Built by
- Google
Google released Gemini 4 Hydrogen as its fast coding and agent-workflow model on 2026-11-12.
Works with
- Gemini API
The stable public API id is gemini-4-hydrogen.
- GitHub Copilot
GitHub Copilot made Hydrogen generally available on 2026-11-13 for eligible plans.
Recommended for
- Gemini Models
Explains Gemini 4 migration behavior, model IDs, and workload routing.
Often paired with
- Gemini Flash
Google recommends migrating gemini-3.8-flash integrations to gemini-4-hydrogen.
Appears in landscapes
- Foundation Model Landscape
Seed foundation models grouped by provider — open-weight vs proprietary — from Entity Platform attributes.
How Gemini 4 Hydrogen evolved
Key moments in chronological order.
- Model
Google releases Gemini 4 Hydrogen (gemini-4-hydrogen), a fast model for daily coding and agent workflows. It has a 1,048,576-token unified context window, supports multimodal input and tool use, and is the recommended migration target for Gemini 3.8 Flash. The Live API is not supported.
Overview
Capabilities
- Vision: Yes
- Audio input: Yes
- Tool calling: Yes
- Thinking: Yes
- MCP: Not documented
- Coding: Yes
- Structured output: Yes
Technical specifications
- Provider
- License
- Proprietary
- Context window
- Unified input and output window
- Parameters
- Undisclosed
- Architecture
- Undisclosed (proprietary)
- Release
- 2026-11
- Modalities
- Text, Image, Audio, Video
- Vision
- Yes
- Audio input
- Yes
- Tool calling
- Yes
- Thinking
- Yes
- MCP
- Not documented
- Open weights
- No
- API
- Yes
- Pricing (input)
- $1.50 per 1M tokens
- Pricing (output)
- $7.50 per 1M tokens
Supported modalities
Inputs: Text · Image · Audio · Video
Output: Text
Context window
Unified input and output window (1,048,576 tokens)
Pricing
Published Gemini API list pricing for the full 1M-token context window; verify the current pricing page before committing production spend.
Availability
Gemini API and Google products
Google announced availability in AI Studio, the Gemini API, Google business products, the Gemini app, Search, and paid Antigravity plans.
API behavior
Supports thinking, structured output, implicit caching, function calling, code execution, grounding, URL context, and computer use. The Live API is not supported. Synchronous output is up to 65,536 tokens; long decode can run in the background for longer outputs within the shared window.
Migration
Google recommends migrating gemini-3.8-flash integrations to gemini-4-hydrogen. Preserve thought signatures in multi-turn/tool workflows; explicit cached-content references are removed in Gemini 4.
Use cases
- Daily coding and agent workflows
- Fast multimodal application paths
- Gemini 3.8 Flash migrations
- Tool-using applications that need structured output
Strengths
- Stable API id gemini-4-hydrogen
- 1,048,576-token unified context window
- Documented tool use, structured output, and long decode
Limitations
- Closed weights
- Live API is not supported
- Gemini 4 migration changes caching and sampling behavior; test before replacing a production pin
- Google’s launch benchmarks are vendor-reported and not a basis for cross-benchmark ranking changes
Related guides
Related benchmarks
Related research
- Introducing Gemini 4 Hydrogen
Announcement
- Gemini 4 Hydrogen documentation
Documentation
- Get started with Gemini 4
Documentation
Related GitHub
Related tools
Related rankings
Related comparisons
Companies
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