Anthropic API vs OpenAI API
Anthropic API is listed under Frontier labs, OpenAI API under Frontier labs. Shared focus: llm-api. Each name links to the product's own site.
| Category | Frontier labs | Frontier labs |
|---|---|---|
| Pricing | Paid | Paid |
| Public code | No | No |
| Tags | claude, llm-api, tool-use, agents | gpt, llm-api, reasoning, embeddings |
| Website | anthropic.com | openai.com |
What Anthropic API does
Anthropic's API for the Claude model family. It supports tool use, long context, prompt caching and a batch endpoint, and is also sold through AWS Bedrock and Google Vertex AI.
What OpenAI API does
OpenAI's developer platform. It serves the GPT family of text and reasoning models, plus image, speech and embeddings endpoints. Billing is per token, with a Responses API for building agents.
Other options
See all Frontier labs, or alternatives to Anthropic API and OpenAI API.