Open-source alternatives to OpenAI API

The open-source or self-hostable project you can use instead of OpenAI API, with license, free-edition limits and setup checked against official sources.

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OllamaAlternative to OpenAI API
A tool for downloading and running open large language models on your own computer or server, with a local REST API.
MITSelf-hostedCloud
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Ollama — Ollama can be used in place of a hosted LLM API when you want to run open models on your own hardware, with a local API on port 11434.