January 2026

Simon Willison's Weblog

jordanhubbard/nanolang

Jordan Hubbard (FreeBSD co-founder) released NanoLang, a programming language specifically designed for LLM code generation. The language successfully demonstrates that LLMs can reduce friction in...

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Universe of AI

GLM-4.7-Flash: 42x Cheaper Than Claude, Actually Good at Coding!

GLM-4.7-Flash is a new open-source AI model that delivers competitive performance at significantly lower costs than premium alternatives. The model excels particularly at coding tasks and agentic...

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AI Engineer

How METR measures Long Tasks and Experienced Open Source Dev Productivity - Joel Becker, METR

Joel Becker from METR presents research on AI capability measurement through "time horizon" metrics and a controversial study showing that AI coding tools may not significantly speed up experienced...

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IndyDevDan

The Claude Code Feature Senior Engineers KEEP MISSING

Claude's latest Code feature allows engineers to build hooks into their prompts, sub-agents, and skills, enabling specialized self-validating agents that automatically check their own work. This...

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Simon Willison's Weblog

Scaling long-running autonomous coding

Cursor successfully ran hundreds of autonomous AI coding agents for a week to build a functional web browser from scratch, generating over 1 million lines of code. This demonstrates AI agents can now...

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