> ## Documentation Index
> Fetch the complete documentation index at: https://docs.apiyi.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Gemini 4 Hydrogen Is Live: The 1M-Window Agent Execution Tier

> Google's Gemini 4 speed tier is now on APIYI with default high thinking, a new xhigh level and a 1M shared window; standard pricing is $1.50 per 1M input tokens and $7.50 per 1M output tokens on both native and OpenAI-compatible endpoints.

**2026/11/14 00:45 (UTC+8)** · New Model · Google

🚀 **`gemini-4-hydrogen` is live: default high thinking and 57% on Terminal-Bench 4.1**

Google's Gemini 4 speed tier, released on 12 November and adapted from Carbon, is positioned as the upgrade path from 3.8 Flash. APIYI connected on 14 November; it is available in the `default` and `svip` groups on both native and OpenAI-compatible endpoints.

Pricing per 1M tokens: \$1.50 input, \$7.50 output (including thinking), \$0.075 cached input. The rate is flat across the full 1M window with no expiry.

Migration notes: thinking defaults to `high` with four levels; `minimal` is rejected and `thinkingBudget` is deprecated; sampling parameters are ignored; keep `max_tokens` at 1024 or higher because thinking counts against it; return `thoughtSignature` verbatim in multi-turn and tool calls.

Read the full analysis in [Gemini 4 Hydrogen Is Live](https://docs.apiyi.com/en/news/gemini-4-hydrogen-launch.md) and see [Model Pricing](https://docs.apiyi.com/en/models/index.md).

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