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llm-gemini 0.35 adds Gemini 4 Argon and highlights changing model costs

simonwillison.net Editor score 7/10

The plugin adds Gemini 4 Argon support; its launch price is $2 per million input tokens and $10 per million output tokens, with a planned price increase, while a benchmark comparison puts its run cost at $2,407. Model selection for agentic workloads depends on total task cost, not token prices alone.

What

llm-gemini 0.35 adds support for Google's Gemini 4 Argon through the Gemini API and a $100/month subscription plan.

How

Argon launches at $2 per million input tokens and $10 per million output tokens, with prices set to double on December 1.

Why it matters

For agentic systems, cost depends on tokens needed per task as well as per-token rates; benchmark run cost offers another comparison.

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