llm-gemini 0.37 notes Gemini 4 Hydrogen launch and prices
Original title: llm-gemini 0.37
Hydrogen is the cheapest Gemini 4 model at $1.50 per million input tokens; Carbon and Argon prices double December 1.
Simon Willison released llm-gemini 0.37 as Google launched Gemini 4 Hydrogen, described as the lowest-cost member of the Gemini 4 family. The note lists Hydrogen at $1.50 per million input tokens, $0.075 cached input, and $7.50 output. Carbon and Argon share a higher rate that is scheduled to double on December 1, 2026. The post questions why those two models are priced identically.
Unconfirmed: The post questions why Carbon and Argon cost the same but does not resolve it.
- Gemini 4 Hydrogen costs $1.50 per million input tokens, $0.075 cached, and $7.50 output.
- Carbon and Argon are $2.00 input and $10.00 output through November 30, 2026.
- Those Carbon and Argon rates double on December 1, 2026.
- Hydrogen is described as the lowest-cost member of the Gemini 4 family.
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From the original article
Release: llm-gemini 0. 37 Google launched Gemini 4 Hydrogen today - the lowest cost member of the Gemini 4 family. It's actually not too far off the price of its much bigger siblings, Carbon and Argon.
simonwillison.net
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