Close call · editorial
OpenAI API vs Anthropic API
Compared for LLM APIs.
Higher score
OpenAI API
90 · S-tier
Products that want the broadest model, tool, and SDK support.
Paid check site
The other pick
Anthropic API
88 · A-tier
Production apps that want Claude specifically, especially for long documents and code.
Paid check site
Sub-scores
| Part | OpenAI API | Anthropic API |
|---|---|---|
| Overall | 90 | 88 |
| Capability | 96 | 95 |
| Ease | 86 | 84 |
| Value | 80 | 76 |
| Momentum | 95 | 94 |
Full lists: Best LLM APIs
Questions
Which is better, OpenAI API or Anthropic API?
This is a close call. OpenAI API is only 2 points ahead on the editorial score. The widest sub-score gap is value, where OpenAI API leads by 4. Choose OpenAI API when this is the job: Products that want the broadest model, tool, and SDK support. Choose Anthropic API when this is the job: Production apps that want Claude specifically, especially for long documents and code.
Which is cheaper, OpenAI API or Anthropic API?
We do not print a dollar winner. OpenAI API is paid (check site). Anthropic API is paid (check site). OpenAI API is ahead on the editorial score, not on a verified invoice. Open both pricing pages.
When should you ignore the higher score?
Ignore OpenAI API's lead when production apps that want Claude specifically, especially for long documents and code. The score is a default, not a mandate.