llm-anthropic 0.25.1: Simon Willison Ships Opus 4.8 Support With Fast Mode Option

Simon Willison·medium signal

Simon Willison released llm-anthropic 0.25.1 on May 28, adding Claude Opus 4.8 model support with a new `-o fast 1` option for organizations with fast mode enabled. Default max_tokens now automatically matches each model's maximum output capacity. Useful for CLI-based agentic workflows and scripting that target the latest Opus model via the LLM tool.