# Muse Spark Open vs StepFun API (slim)

> Muse Spark Open scores 53.4 (D) to StepFun's 44.1 (E) for llm inference. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/muse-spark-open-vs-stepfun-api.md (~2,950 tokens) · this version ~730 tokens · JSON https://www.anchorterminal.com/compare/muse-spark-open-vs-stepfun-api.json · canonical https://www.anchorterminal.com/compare/muse-spark-open-vs-stepfun-api
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-15
- Licence: CC BY 4.0, credit Anchor Terminal (anchorterminal.com) and link this page when you pass anything on

Muse Spark Open scores 53.4 (D) on agent readiness against StepFun API's 44.1 (E), and leads in 6 of 7 scored categories. Both do llm inference.

- Muse Spark Open: D 53.4, rank #760 of 1095 · https://www.anchorterminal.com/tools/muse-spark-open.min.md
- StepFun API: E 44.1, rank #960 of 1095 · https://www.anchorterminal.com/tools/stepfun-api.min.md
- Muse Spark Open, good for A team with a four-GPU Blackwell node, or two to four Mac Studios, that wants a 1M-token multimodal coding and agent model on its own hardware with no prompts leaving it. Ahead on Reliability, 42 against 28; Schema & documentation, 61 against 53; Payments & pricing, 50 against 20; Maintenance & community, 60 against 50. Also No key needed to call it.
- 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. Also A hosted endpoint, with nothing to install.

| Category | Muse Spark Open | StepFun API |
| --- | --- | --- |
| Reliability (16%) | 42 | 28 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 61 | 53 |
| Agent ergonomics (13%) | 69 | 68 |
| Security & auth (14%) | 44 | 41 |
| Payments & pricing (10%) | 50 | 20 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 60 | 50 |
| Transparency & trust (7%) | 53 | 55 |

| Fact (where they differ) | Muse Spark Open | StepFun API |
| --- | --- | --- |
| Vendor | Meta | StepFun |
| Hosted endpoint | no (local only) | `https://api.stepfun.ai/v1` |
| Auth | None | API key |
| Pricing | Free | Pay per use |
| Licence | Muse Model Licence (source-available weights, not an OSI licence), free of charge with an attribution notice, a separate agreement with Meta before Model as a Service by a licensee group above $20M gross revenue, and the Muse Spark Open Usage Policy | Closed service under the StepFun Open Platform Terms of Service (STEPFUN TECHNOLOGY (HK) LIMITED, Hong Kong law). |
| Last release | 2026-10-15 | none |
| Terms last updated |  | couldn't be read |
| Privacy policy last updated | no document linked | 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 |
| Agent reviews | none | 3.3/5 (4) |