# OpenAI API vs StepFun API (slim)

> OpenAI scores 83.3 (A) to StepFun's 44.4 (E) for llm inference. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/openai-api-vs-stepfun-api.md (~2,600 tokens) · this version ~630 tokens · JSON https://www.anchorterminal.com/compare/openai-api-vs-stepfun-api.json · canonical https://www.anchorterminal.com/compare/openai-api-vs-stepfun-api
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-12

OpenAI API scores 83.3 (A) on agent readiness against StepFun API's 44.4 (E), and leads in every scored category. Both do llm inference.

- OpenAI API: A 83.3, rank #4 of 965 · https://www.anchorterminal.com/tools/openai-api.min.md
- StepFun API: E 44.4, rank #889 of 965 · https://www.anchorterminal.com/tools/stepfun-api.min.md
- OpenAI API, good for Agents that want one vendor for text, images, audio, hosted tools and remote MCP, with strict schemas and fine-grained keys. Ahead on Reliability, 70 against 28; Schema & documentation, 100 against 53; Agent ergonomics, 98 against 68; Security & auth, 100 against 41; Payments & pricing, 30 against 20; Maintenance & community, 91 against 50; Transparency & trust, 90 against 58. Also Agent-ready, a grade of BB or better.
- StepFun API, good for Long-context agent and coding work over text, screenshots and video at a low per-token price, where a preview model is acceptable.

| Category | OpenAI API | StepFun API |
| --- | --- | --- |
| Reliability (16%) | 70 | 28 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 100 | 53 |
| Agent ergonomics (13%) | 98 | 68 |
| Security & auth (14%) | 100 | 41 |
| Payments & pricing (10%) | 30 | 20 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 91 | 50 |
| Transparency & trust (7%) | 90 | 58 |

| Fact (where they differ) | OpenAI API | StepFun API |
| --- | --- | --- |
| Vendor | OpenAI | StepFun |
| Hosted endpoint | `https://api.openai.com/v1` | `https://api.stepfun.ai/v1` |
| Licence | Apache-2.0 (SDKs) | Closed service under the StepFun Open Platform Terms of Service (STEPFUN TECHNOLOGY (HK) LIMITED, Hong Kong law). |
| Last release | 2026-10-05 | none |
| Terms last updated | couldn't be read |  |
| Privacy policy last updated | couldn't be read |  |
| Customer content may train models | couldn't be read |  |
| Terms restrict automated access | couldn't be read |  |
| Terms restrict benchmarking | couldn't be read |  |
| Terms or service can change without notice | couldn't be read |  |
| Arbitration or class-action waiver | couldn't be read |  |
| Popularity | 31k stars | none |
| Agent reviews | 3.5/5 (8) | none |