Step 5 Preview
StepFunReleased Sep 16, 2026Closed weightsstep-5-preview
- Reasoning
- yes, with effort levels
- Context
- 1M tokens
- Max output
- 64K tokens
- Input
- text, image, video
- API features
- tools, structured outputs, JSON mode, logprobs
- StepFun's API
- yes
Read Oct 23, 06:00 UTC from the hosts' published offers and OpenRouter, spec sheet from StepFun
| Provider | Input | Output | Cache ↑ | tok/s | First token | Uptime 24h | Checked |
|---|---|---|---|---|---|---|---|
| StepFun | $1.00 | $2.70 | $0.10 | 104 | 3.51 s | 100% | Oct 23 |
| Novita AI | $1.00 | $2.70 | $0.10 | — | — | — | Oct 23 |
2 of 2 providers · prices per million tokens, read Oct 23, 06:00 UTC · speed: OpenRouter, median of the last 30 min, read Oct 23, 06:00 UTC · uptime: OpenRouter, last 24 h
| Provider | Weights | Context | Max output | Tools | Structured outputs | Reasoning |
|---|---|---|---|---|---|---|
| StepFun | fp8 | 1M | 64K | yes | yes | yes |
| Novita AI | — | 1M | 64K | — | — | — |
As served by each host and declared to OpenRouter; not verified by us · weights: the precision the host declares
Step 5 Preview spec sheet, field by field, with sources
Step 5 Preview spec sheetmaker-declared
What StepFun declares about the model itself — read from its own weights repository and documentation, not from any host. What each endpoint actually serves is in the pricing above: the two can differ, and both are true.
- Context window
- 1,000,000 tokens
- Parameters
- not published by the maker
- Active experts
- not published by the maker
- Weight precision
- not applicable — no weights publishedcurated
- License
- Proprietary — API onlycuratedScope: the licence on the published weights, and nothing else. It is not the maker's acceptable-use policy, which is a separate document, and it is not the contract you sign with whichever host you call — hosts set their own terms, which this index does not read.
- Knowledge cutoff
- not published by the maker
- Modalities
- text · image · video → text
- Max output (official)
- 64,000 tokens
- Release date
- not published by the maker
- Maker lifecycle status
- not published by the maker
platform.stepfun.ai · maker's documentation · read 2026-10-12 · 4 of 10 fields published by the maker
| Provider | Chatbot 1,000 in / 500 out | RAG / long context 8,000 in / 500 out | Batch summarize 4,000 in / 1,000 out |
|---|---|---|---|
| StepFun | $2.35 | $9.35 | $6.70 |
| Novita AI | $2.35 | $9.35 | $6.70 |
What each host bills for 1,000 requests of a representative job
Your own workload
Other StepFun models · all its models, hosts and history ›
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