AI model
google/gemini-4-hydrogen
Google: Gemini 4 Hydrogen is a 1,048,576-token model served on Composite at $0.938 per million tokens in and $4.69 per million tokens out.
Try in Playground| Model ID | google/gemini-4-hydrogen |
|---|---|
| Provider | Google AI Studio |
| Context window | 1,048,576 tokens |
| Accepts | audio, file, image, text, video |
| Returns | text |
| Input price | $0.938 per million tokens |
| Output price | $4.69 per million tokens |
| Prompt caching | Supported — cached input is billed at the provider's cache rate, on credits and plans alike |
| Image input | $9.4e-7 per image |
| Audio input | $9.4e-7 per second |
| Reasoning tokens | $4.69 per million tokens |
| Web search | $0.0175 per result |
| Thinking | Always on for this model |
| Moderated | No |
| Cost on a monthly plan | About 9.8 plan credits per typical call (8k in, 1k out) |
| Routing endpoints | 2 (base plus 1 routing variant) |
Make a Composite API key and type google/gemini-4-hydrogen as the model name. JanitorAI takes the full URL https://composite.lucidity.sh/v1/chat/completions; SillyTavern, ChubAI, Agnai and RisuAI take https://composite.lucidity.sh/v1. It runs on credits, a plan, or your own provider key.
JanitorAI setup · SillyTavern setup · Best Janitor AI proxies compared
This model has not carried enough traffic on Composite yet to publish a success rate, a latency figure or a traffic rank. The numbers appear here once it has.
The same model behind 1 alternative endpoint. Call the id directly to pin a route; the base id above picks for you.
| Route | Model ID | Provider | Price |
|---|---|---|---|
| cheapThink | google/gemini-4-hydrogen:cheapThink |
Google AI Studio | $0.938 per million tokens input · $4.69 per million tokens output |
$0.938 per million tokens input · $4.69 per million tokens output
Credits pay the provider’s price plus 25%; cache hits cost less.
On a monthly plan, a typical call (8k tokens in, 1k out) uses about 9.8 plan credits, at the provider's own price.
Google AI Studio
Gemini models combine large context windows with fast throughput, which keeps response times low even in busy group chats.
With a 1,048,576-token context window, it can hold a long-running roleplay or a full lorebook in memory without losing earlier plot details, so it suits multi-session campaigns and character cards with heavy backstory.
It sits in the mid-range on price, a reasonable pick for regular roleplay use without going for the cheapest option available.
Gemini 4 Hydrogen is the high-efficiency workhorse model of the Gemini 4 family from Google, built for high-throughput agentic workflows, coding and multi-model routing at lower cost and latency than...
Supplied by Google AI Studio, not written by Composite.
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