https://geno-lang.org/blog/ Notes, releases and design writing from the Geno project. https://geno-lang.org/blog/geno-0-5-0.html https://geno-lang.org/blog/geno-0-5-0.html Wed, 14 Oct 2026 12:00:00 +0000 Geno 0.5.0 makes main() -> Int your process exit status, adds named constructor arguments, and runs an Async value at most once. Here is what changed and how to migrate. https://geno-lang.org/blog/the-playground-runs-the-real-compiler.html https://geno-lang.org/blog/the-playground-runs-the-real-compiler.html Wed, 14 Oct 2026 12:00:00 +0000 Most language playgrounds send your code to a server. Geno's runs the actual CLI inside your browser tab, with Python compiled to WebAssembly and a 600 KB bundle of the toolchain. https://geno-lang.org/blog/examples-are-the-specification.html https://geno-lang.org/blog/examples-are-the-specification.html Wed, 14 Oct 2026 12:00:00 +0000 Ordinary Geno functions must carry at least one example clause, and geno test runs them all. Why we made examples mandatory, and what that buys you when a model writes the code. https://geno-lang.org/blog/why-geno-writes-end-func.html https://geno-lang.org/blog/why-geno-writes-end-func.html Wed, 14 Oct 2026 12:00:00 +0000 Braces and indentation work well for people with editors. Generated code needs boundaries that survive truncation, reformatting and streaming, so every Geno block closes by name. https://geno-lang.org/blog/fail-closed-capabilities.html https://geno-lang.org/blog/fail-closed-capabilities.html Wed, 14 Oct 2026 12:00:00 +0000 A Geno program cannot read a file, open a socket or start a process unless the command that runs it says so. Here is how capability gating works on each surface, including where it does not protect you. https://geno-lang.org/blog/what-we-measure.html https://geno-lang.org/blog/what-we-measure.html Wed, 14 Oct 2026 12:00:00 +0000 Geno's compiled Python lands at a median 1.60x the time of hand-written Python across 53 measured problems. Whether models write more correct code in Geno is a question we have not answered publicly, and here is why. https://geno-lang.org/blog/geno-written-in-geno.html https://geno-lang.org/blog/geno-written-in-geno.html Wed, 14 Oct 2026 12:00:00 +0000 The repository includes a lexer, parser, type checker and interpreter for Geno, written in about 8,400 lines of Geno. What it covers, what it does not, and why we keep it honest with a parity check.