Simon Willison • 12/17/2025

ty: An extremely fast Python type checker and LSP

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Astral has released the first beta of 'ty', a new Python type checker and LSP. It claims to be 10x to 60x faster than mypy and Pyright without caching, and up to 500x faster in editor scenarios. The article covers initial performance benchmarks, how to try it via uvx, and the release of a companion VS Code extension.

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#Python #performance #type checking
ty: An extremely fast Python type checker and LSP

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