OpenAI
Company behind GPT (ChatGPT, GPT-4, GPT-4o, o1). Commercial pioneer of LLMs. REST API + Python/TypeScript SDKs. Direct competitor of Anthropic. Often the default in tutorials.
Strengths
- Broadest ecosystem: LLM, embeddings, vision, TTS, Whisper, Sora
- Documentation and tutorials everywhere, easy to debug
- Often cheaper than Claude at inference
Limitations
- Models sometimes weaker than Claude on long reasoning and code
- No zero-data-retention by default like Anthropic
Best for
- Follow an OpenAI-first tutorial without adapting
- Embeddings, TTS, Whisper STT, where OpenAI leads