Gemini 4 Hydrogen API

Overview

About this model

Gemini 4 Hydrogen is an efficient multimodal model from Google for everyday coding and agentic workflows. It supports text, image, video, audio, and PDF inputs, and provides text output, adjustable thinking intensity, tool calling, and structured output; it supports implicit caching but not explicit caching.

Capabilities

Capability matrix

Pricing and groups

Routes and pricing

Prices in USD per 1M tokens. Rates follow provider adjustments; live prices in Model Explorer as the reference.

Snapshot: 2026-11-13 19:48. Availability reflects active probes over the past 24 hours; performance reflects actual calls.

API

Integration example

All models share one OpenAI-compatible endpoint. To switch models, change the model field. One key accesses every model.

# pip install openai
from openai import OpenAI

client = OpenAI(
    base_url="https://api.yomiapi.com/v1",
    api_key="sk-your-yomi-key",
)

resp = client.chat.completions.create(
    model="gemini-4-hydrogen",
    messages=[{"role": "user", "content": "Hello"}],
)
print(resp.choices[0].message.content)

curl https://api.yomiapi.com/v1/chat/completions \
  -H "Authorization: Bearer sk-your-yomi-key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gemini-4-hydrogen",
    "messages": [{"role": "user", "content": "Hello"}]
  }'