Wild APIs
1,609 listings19 categoriesVerified weeklySubmit an API

Open-Source LLM APIs

These providers host open-weight models, so you can call them without running GPUs yourself, and most expose an OpenAI-compatible API. Groq has a freemium plan and also serves Whisper for speech, Cerebras runs models such as GPT-OSS 120B on wafer-scale chips, and Fireworks AI adds Anthropic-compatible endpoints. Together AI is pay-per-token with chat, image and embedding models. Free LLM APIs →
4 listings
TableRows
APIPricingAuthFormatFree tierStatus
Cerebras InferenceChat completions on open-weight models such as GPT-OSS 120B, served on Cerebras wafer-scale chips.
AI & Machine Learning › LLMs
Free trialAPI keyJSON—Live
Fireworks AIServerless open-weight LLM, vision and embedding models with OpenAI- and Anthropic-compatible endpoints.
AI & Machine Learning › LLMs
Free trialAPI keyJSON—Live
GroqOpenAI-compatible chat, speech-to-text and text-to-speech on open-weight models such as GPT-OSS and Whisper
AI & Machine Learning › LLMs
FreemiumAPI keyJSON—Live
Together AIPay-per-token hosting for open-weight chat, image and embedding models behind an OpenAI-compatible interface.
AI & Machine Learning › LLMs
PaidAPI keyJSON—Live

Choosing an Open-Source LLM API

Is there a free Open-Source LLM API?

Yes. Groq has a free tier alongside paid plans. See all free LLM APIs.

Which Open-Source LLM APIs work without an API key?

All of them need a key or account. Groq gives one out free when you sign up.

Can I use Open-Source LLM APIs in a commercial project?

Groq, Together AI, Fireworks AI and Cerebras Inference permit commercial use.

Broader: LLMs APIs · AI & Machine Learning APIs