Best OpenAI API alternatives.
Live source-backed alternatives to OpenAI API for LLM APIs. Alternatives are selected from the same task category and update whenever the best-of index rebuilds.
OpenAI API
Official OpenAI API documentation for model APIs, responses, structured outputs, realtime audio, tool calling, and developer applications. official_service llm api model api responses api structured output tool calling function calling text audio vision image api hosted json mode long context chat completions agents
Google Gemini API
Matched llm api, model api, function calling; 2 source links; official service signal; access model: Paid API
Anthropic Claude API
Matched llm api, model api, function calling; 2 source links; official service signal; access model: Paid API
| # | Alternative | Kind | Access | Fit | Why it appears | Source |
|---|---|---|---|---|---|---|
| 01 | Google Gemini API | service | Paid API | Score94 | Matched llm api, model api, function calling; 2 source links; official service signal; access model: Paid API | ai.google.dev |
| 02 | Anthropic Claude API | service | Paid API | Score83 | Matched llm api, model api, function calling; 2 source links; official service signal; access model: Paid API | platform.claude.com |
| 03 | NVIDIA NIM Model Catalog | service | Free endpoint | Score78 | Matched llm api, model api, inference api; 3 source links; official inference catalog signal; access model: Free endpoint | build.nvidia.com |
| 04 | xAI API | service | Paid API | Score78 | Matched llm api, model api, inference api; 3 source links; official service signal; access model: Paid API | x.ai |
| 05 | Hugging Face Inference Providers | service | Paid API | Score75 | Matched llm api, model api, inference api; 2 source links; official inference catalog signal; access model: Paid API | huggingface.co |
| 06 | OpenRouter API | service | Paid API | Score74 | Matched llm api, model api, inference api; 2 source links; official service signal; access model: Paid API | openrouter.ai |
| 07 | Fireworks AI Serverless Models | service | Paid API | Score74 | Matched llm api, model api, inference api; 2 source links; official inference catalog signal; access model: Paid API | docs.fireworks.ai |
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