Stepfun Step 5 Preview (LLM): On AA Pareto frontier
Stepfun's Step 5 Preview is a proprietary large language model released in September 2026 that ranks 25th out of 200 models on the Artificial Analysis Intelligence Index. The model offers competitive pricing with input costs of $1.00 and output costs of $2.70 per million tokens, significantly below the market median for output. It supports text and image inputs with a 1 million token context window and is noted for being highly verbose during benchmark evaluations.
- ▪Step 5 Preview achieved a score of 44 on the Artificial Analysis Intelligence Index, placing it above the median score of 25.
- ▪The model is priced at $1.00 per 1M input tokens and $2.70 per 1M output tokens, which is considered competitively priced compared to industry medians.
- ▪It supports both text and image modalities for input and generates text output with a context window of 1 million tokens.
- ▪During the Intelligence Index evaluation, the model generated 160 million tokens, which is significantly higher than the median of 90 million tokens.
- ▪The total cost to evaluate the model on the Intelligence Index was $918.34.
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| Original publisher | Artificialanalysis |
| Canonical URL | https://artificialanalysis.ai/models/step-5 |
| Publication time | Sat, 19 Sep 2026 05:42:31 +0000 |
| Retrieval time | 2026-09-19T05:48:45.958Z |
| Last seen | 2026-09-19T05:48:45.958Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | aL-KuZryqch8 · 1 stories |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
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Artificial AnalysisKArtificial AnalysisModelsCoding AgentsImage, Speech, VideoInferenceLeaderboardsAboutAI TrendsArenasKStepFun•Proprietary model•Released September 2026Step 5 Preview Intelligence, Performance & Price AnalysisCompareTry it out API Provider Benchmarks Model summaryIntelligenceUpdated#25 / 20044Artificial Analysis Intelligence Index4 out of 4 units for Intelligence.SpeedN/AOutput tokens per secondUnknown out of 4 units for Speed.Cost#27 / 200In $1.00Out $2.70Cache Discount 95%$0.71Cost per Intelligence Index task2 out of 4 units for Cost.Verbosity#65 / 200160MOutput tokens from Intelligence Index4 out of 4 units for Verbosity.Comparison SummaryStep 5 Preview is amongst the leading models in intelligence and well priced when comparing to other models of similar price.
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