# Claude API vs StepFun API (slim)

> Claude scores 77.3 (BB) 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/anthropic-api-vs-stepfun-api.md (~2,700 tokens) · this version ~630 tokens · JSON https://www.anchorterminal.com/compare/anthropic-api-vs-stepfun-api.json · canonical https://www.anchorterminal.com/compare/anthropic-api-vs-stepfun-api
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-12

Claude API scores 77.3 (BB) on agent readiness against StepFun API's 44.4 (E), and leads in every scored category. Both do llm inference.

- Claude API: BB 77.3, rank #21 of 965 · https://www.anchorterminal.com/tools/anthropic-api.min.md
- StepFun API: E 44.4, rank #889 of 965 · https://www.anchorterminal.com/tools/stepfun-api.min.md
- Claude API, good for Long agent loops that lean on tool use, strict schemas and caching, and teams that want 1M context at Opus or Sonnet prices. Ahead on Reliability, 60 against 28; Schema & documentation, 90 against 53; Agent ergonomics, 95 against 68; Security & auth, 92 against 41; Payments & pricing, 30 against 20; Maintenance & community, 91 against 50; Transparency & trust, 85 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 | Claude API | StepFun API |
| --- | --- | --- |
| Reliability (16%) | 60 | 28 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 90 | 53 |
| Agent ergonomics (13%) | 95 | 68 |
| Security & auth (14%) | 92 | 41 |
| Payments & pricing (10%) | 30 | 20 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 91 | 50 |
| Transparency & trust (7%) | 85 | 58 |

| Fact (where they differ) | Claude API | StepFun API |
| --- | --- | --- |
| Vendor | Anthropic | StepFun |
| Hosted endpoint | `https://api.anthropic.com/v1/messages` | `https://api.stepfun.ai/v1` |
| Licence | MIT (SDKs) | Closed service under the StepFun Open Platform Terms of Service (STEPFUN TECHNOLOGY (HK) LIMITED, Hong Kong law). |
| Last release | 2026-10-09 | none |
| Terms last updated | no date given |  |
| Privacy policy last updated | no date given |  |
| Customer content may train models | yes, with an opt-out |  |
| Terms restrict automated access | not found in the text |  |
| Terms restrict benchmarking | yes |  |
| Terms or service can change without notice | not found in the text |  |
| Arbitration or class-action waiver | yes |  |
| Popularity | 3.9k stars | none |