Simon Willison's blog offers a mix of technical tutorials, data analysis projects, and reflections on technology and society. With a focus on Python, SQL, and web development, Simon shares insights into building web applications, working with data, and exploring emerging technologies. Developers can learn about data visualization, API design, and software engineering best practices, gaining inspiration and practical knowledge to advance their careers.

Simon Willison

Meta released Muse Spark, their first model since Llama 4, available via meta.ai chat (not open weights yet). The model offers 'Instant' and 'Thinking' modes with a 'Contemplating' mode promised. Simon Willison explores the 16 tools wired into the meta.ai chat interface, including web browsing, Meta social content search, Python code execution (Code Interpreter), HTML/SVG artifact creation, image generation, sub-agent spawning, and a visual grounding tool (likely powered by Segment Anything) that can identify, locate, and count objects in images. Benchmarks place Muse Spark competitive with top frontier models, and Meta hints at future open-sourcing.

Meta’s new model is Muse Spark, and meta.ai chat has some interesting tools