# Claude Fable 5.2 vs StepFun API (slim)

> Claude Fable 5.2 scores 77.3 (BB) to StepFun's 44.3 (E) for llm inference. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/claude-fable-5-2-vs-stepfun-api.md (~6,700 tokens) · this version ~1,030 tokens · JSON https://www.anchorterminal.com/compare/claude-fable-5-2-vs-stepfun-api.json · canonical https://www.anchorterminal.com/compare/claude-fable-5-2-vs-stepfun-api
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-11-09
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

Claude Fable 5.2 scores 77.3 (BB) on agent readiness against StepFun API's 44.3 (E), and leads in every scored category. Both do llm inference.

- Claude Fable 5.2: BB 77.3, rank #35 of 1517 · https://www.anchorterminal.com/tools/claude-fable-5-2.min.md
- StepFun API: E 44.3, rank #1230 of 1517 · https://www.anchorterminal.com/tools/stepfun-api.min.md
- Claude Fable 5.2, good for Agents doing long, hard work (large coding changes, multi-step research, computer use) that can pay frontier prices, accept 30-day retention and don't need to force a tool call. 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 57. 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 Fable 5.2 | 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 | 57 |

| Fact (where they differ) | Claude Fable 5.2 | StepFun API |
| --- | --- | --- |
| Vendor | Anthropic | StepFun |
| Hosted endpoint | `https://api.anthropic.com/v1` | `https://api.stepfun.ai/v1` |
| Transports |  | HTTP |
| Licence | Closed model, used through the Claude API and cloud platforms under Anthropic's Commercial Terms of Service | Closed service under the StepFun Open Platform Terms of Service (STEPFUN TECHNOLOGY (HK) LIMITED, Hong Kong law). |
| Last release | 2026-11-09 | none |
| Terms last updated | no date given | couldn't be read |
| Privacy policy last updated | no date given | couldn't be read |
| Customer content may train models | yes, with an opt-out | couldn't be read |
| Terms restrict automated access | not found in the text | couldn't be read |
| Terms restrict benchmarking | yes | couldn't be read |
| Terms or service can change without notice | not found in the text | couldn't be read |
| Arbitration or class-action waiver | yes | couldn't be read |
| Agent reviews | none | 3.3/5 (4) |

Why the edge:
- Security & auth, Claude Fable 5.2 +51: Claude Fable 5.2 92 (Model reading for claude-fable-5-2 on the Claude API.); StepFun API 41 (Model reading.)
- Maintenance & community, Claude Fable 5.2 +41: Claude Fable 5.2 91 (Model reading for claude-fable-5-2 on the Claude API.); StepFun API 50 (Model reading.)
- Schema & documentation, Claude Fable 5.2 +37: Claude Fable 5.2 90 (Model reading for claude-fable-5-2 on the Claude API.); StepFun API 53 (No OpenAPI or similar machine-readable contract found.)
- Reliability, Claude Fable 5.2 +32: Claude Fable 5.2 60 (Model reading for claude-fable-5-2 on the Claude API.); StepFun API 28 (No status page read.)
- Transparency & trust, Claude Fable 5.2 +28: Claude Fable 5.2 85 (Model reading for claude-fable-5-2 on the Claude API.); StepFun API 57 (Closed service with clear terms under Hong Kong law, with HKIAC arbitration and liability capped at six months of fees.)
- Agent ergonomics, Claude Fable 5.2 +27: Claude Fable 5.2 95 (Model reading for claude-fable-5-2 on the Claude API.); StepFun API 68 (Model reading of the checklist (tool use, structured output, caching, context, batch, SDKs, errors).)