ell - The Language Model Programming Library

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library 0.0.17 ·python
verified May 9, 2026

ell is a Python library for programming language models (LMs) with a functional, composable API. It provides decorators for defining LM prompts, supports multiple model providers (OpenAI, Anthropic, etc.), and includes tools for tracing and versioning. Current version 0.0.17, actively developed with weekly releases.

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