Simon Willison Releases llm-gemini 0.35 with Gemini 4 Argon Support
Simon Willison released llm-gemini 0.35, adding support for Google's new Gemini 4 Argon frontier model. The release also highlights the model's high-quality SVG rendering capabilities and competitive benchmark pricing. This update allows developers using Simon Willison's LLM ecosystem to immediately access Google's latest frontier model via the command line. It also provides practical cost insights into running complex agentic benchmarks compared to rival models from OpenAI and Anthropic. Gemini 4 Argon launches at $2 per million input tokens and $10 per million output tokens, though its price is set to double on December 1st. Artificial Analysis benchmarking data shows Argon costs $2,407 to run a full test suite, making it significantly cheaper than top-tier models from Anthropic and OpenAI.
## BACKGROUND
The 'llm' tool created by Simon Willison is a popular Python-based command-line utility for interacting with various Large Language Models through plugins. Google's Gemini 4 Argon is a natively multimodal reasoning model designed for complex real-world software engineering, enterprise knowledge work, and cybersecurity defense.