Reasoning through X-High. Choose Low, Medium, High or X-High. Gemini 4 Hydrogen has no fully-off setting, so with reasoning off it runs at Low.

Reads images, PDFs, audio and video directly, with a context window of about 1 million tokens.

Uses less of your API usage budget per token than Gemini 4 Carbon and Gemini 4 Argon.

Math and logic of moderate difficulty now go to Gemini 4 Hydrogen, which answered them more accurately in testing.

Writing of moderate difficulty, such as emails, posts and short documents, now goes to Gemini 4 Hydrogen, which wrote better in testing and uses less of your API usage budget. These replies can take a few seconds longer to start.

Coding of moderate difficulty, from writing code and building front ends to fixing bugs, now goes to Gemini 4 Hydrogen, which did as well or better in testing and uses less of your API usage budget.

Research and planning of moderate difficulty now go to Gemini 4 Hydrogen, which was rated as well as before for about a quarter of the API usage budget. Plans can take longer to start.

Backup choices. When Auto's first choice for a message isn't available, more kinds of work now fall back to Gemini 4 Hydrogen instead of Gemini 4 Argon.

Memory commands answer faster. A "remember…" or "forget…" command typed in memory settings is now read by Gemini 4 Hydrogen, which answered every ordinary command in testing within 8 seconds, where some took Gemini 4 Argon too long to answer.