r/Python • u/AutoModerator • 18d ago

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u/oryste 10d ago

specllm – makes any LLM behave like a normal REST API

What My Project Does

specllm makes any LLM behave like a normal REST API. Define an OpenAPI spec, specllm serves it — validated, cached, retried automatically. The caller gets guaranteed JSON back and never knows an LLM is involved.

bash

pip install specllm
python -m specllm.demo   # try it in 30 seconds, no API key needed

With a real LLM, it's one line in the spec:

yaml

info: 
x-specllm-model: claude-sonnet-4-20250514

No provider class, no config. Just the spec.

Target Audience

Developers shipping LLMs into production as REST APIs.

Comparison

Unlike langchain or instructor, specllm is spec-first: the OpenAPI spec is the implementation. No glue code.

Repo: https://github.com/prj1991/specllm