# Claude API vs OpenAI API (slim)

> OpenAI API has a score of 82.8 (A) against Claude API's 77.6 (BB). Both do llm inference. The largest gap is reliability, 10 points. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/anthropic-api-vs-openai-api.md (~1,500 tokens) · this version ~330 tokens · JSON https://www.anchorterminal.com/compare/anthropic-api-vs-openai-api.json · canonical https://www.anchorterminal.com/compare/anthropic-api-vs-openai-api
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-04

OpenAI API has a score of 82.8 (A) against Claude API's 77.6 (BB). Both do llm inference. The largest gap is reliability, 10 points.

- Claude API: BB 77.6, rank #18 of 452 · https://www.anchorterminal.com/tools/anthropic-api.min.md
- OpenAI API: A 82.8, rank #2 of 452 · https://www.anchorterminal.com/tools/openai-api.min.md
- Pick Claude API for nothing in particular. Pick OpenAI API for reliability (+10), schema & documentation (+10), security & auth (+8).

| Category | Claude API | OpenAI API |
| --- | --- | --- |
| Reliability (16%) | 60 | 70 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 90 | 100 |
| Agent ergonomics (13%) | 95 | 98 |
| Security & auth (14%) | 92 | 100 |
| Payments & pricing (10%) | 30 | 30 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 91 | 91 |
| Transparency & trust (7%) | 88 | 85 |