Simon Willison’s Weblog

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Monday, 5th January 2026

Oxide and Friends Predictions 2026, today at 4pm PT (via) I joined the Oxide and Friends podcast last year to predict the next 1, 3 and 6 years(!) of AI developments. With hindsight I did very badly, but they're inviting me back again anyway to have another go.

We will be recording live today at 4pm Pacific on their Discord - you can join that here, and the podcast version will go out shortly afterwards.

I'll be recording at their office in Emeryville and then heading to the Crucible to learn how to make neon signs.

# 4:53 pm / podcasts, ai, llms, oxide

It’s hard to justify Tahoe icons (via) Devastating critique of the new menu icons in macOS Tahoe by Nikita Prokopov, who starts by quoting the 1992 Apple HIG rule to not "overload the user with complex icons" and then provides comprehensive evidence of Tahoe doing exactly that.

In my opinion, Apple took on an impossible task: to add an icon to every menu item. There are just not enough good metaphors to do something like that.

But even if there were, the premise itself is questionable: if everything has an icon, it doesn’t mean users will find what they are looking for faster.

And even if the premise was solid, I still wish I could say: they did the best they could, given the goal. But that’s not true either: they did a poor job consistently applying the metaphors and designing the icons themselves.

# 7:30 pm / apple, design, macos, usability

Research pymemchr — pymemchr is a Python library that provides ultra-fast byte and substring search functions by binding to the memchr Rust crate, leveraging SIMD optimizations for superior performance. Using PyO3 and Maturin for cross-language integration, pymemchr offers efficient routines for finding single bytes, searching for multiple bytes, and locating substring patterns, both forwards and backwards, with highly competitive speedup over native Python methods.
Research sqlite3-wasm Investigation Report — Seeking to enable Python's SQLite interface with WebAssembly, the project developed a `sqlite3_wasm` library—a drop-in replacement for Python's standard `sqlite3` module. By compiling SQLite 3.45.3 to WASM with wasi-sdk and wrapping the resulting binary with a Python API, the solution delivers fully functional, in-memory, WASM-powered database operations using the wasmtime runtime.
Research pymemchr-c: C Implementation of memchr Library — Offering a pure C reimplementation of the Rust-based pymemchr, pymemchr-c delivers high-performance byte and substring search functions to Python with extensive SIMD (SSE2/AVX2/NEON) optimizations and runtime CPU feature detection. Its unique "Packed Pair" substring search algorithm enables the C version to outperform both Python's built-in methods (up to 28x faster) and the original Rust extension (up to 1.5x faster for substring operations), all while removing the need for a Rust toolchain.
Sunday, 4th January 2026
Tuesday, 6th January 2026