Step 5 Preview
Stepfun · stepfun/step-5-preview
Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in software engineering and professional...
Step 5 Preview ranks #233 of 377 models in the default AI Benchmark Hub order (quality first, then cost). At $1.85 blended per million tokens, it is cheaper than 37% of models with published API pricing. Its 1,000,000-token context window is 3.8× the catalog median (262,144 tokens).
Context
Max output: 64000
Pricing
Output / 1M: 2.70
Blend / 1M: 1.85
Quality
Provider
Moderated: no
Monthly cost at this blended rate
Estimated API spend if every token is billed at $1.85per million (the blend of this model's input and output prices). Real bills depend on the input/output mix.
| Tokens / month | Est. cost (USD) |
|---|---|
| 1,000,000 | $1.85 |
| 10,000,000 | $18.50 |
| 100,000,000 | $185.00 |
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