What are the best alternatives to OpenAI API?

The top alternatives to OpenAI API are Claude Fable 5, Gemini 3, Claude Opus 4.8, ranked by real usage data on Unfragile.

Are there free alternatives to OpenAI API?

Yes, 10 free alternatives to OpenAI API exist, including Llama 4, GPT-4o, Mistral Large.

Best Alternatives to OpenAI API

20 alternatives ranked by real usage data. OpenAI API scores 22/100 — 20 tools score higher.

OriginalOpenAI API

OpenAI's API provides access to GPT-4 and GPT-5 models, which performs a wide variety of natural language tasks, and Codex, which translates natural language to code.

20 alternatives

10 free options

20 score higher

Claude Fable 595/100Higher rated

Anthropic's 2026 flagship — strongest Claude for agents, long-horizon coding, and tool orchestration.

Model

Best Alternatives to OpenAI API

Company