Step 5 Preview, a 1M-context MoE from StepFun, shows up on OpenRouter
StepFun has released Step 5 Preview, a Mixture of Experts model featuring a one-million token context window. The model is now available for use on the OpenRouter platform. This release highlights the ongoing trend of large-scale AI models becoming accessible through centralized API aggregators.
- ▪StepFun introduced Step 5 Preview, a Mixture of Experts architecture model.
- ▪The model supports a context window of one million tokens.
- ▪Step 5 Preview has been integrated into the OpenRouter marketplace.
- ▪The release allows developers to access the model via OpenRouter's API.
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Story provenance
Attribution is not the same as permission. This drawer separates discovery metadata, excerpts, WeSearch-generated summaries, reuse status, and whether the publisher receives the visit. Nothing here claims a legal grant the publisher has not made.
Record
| Original publisher | Openrouter |
| Canonical URL | https://openrouter.ai/stepfun/step-5-preview |
| Publication time | Thu, 08 Oct 2026 16:20:20 +0000 |
| Retrieval time | 2026-10-08T16:57:12.568Z |
| Last seen | 2026-10-08T16:57:12.568Z |
| 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 | mJrlXn20i965 · 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.
Opening excerpt (first ~120 words) tap to expand
body[data-shader-fullscreen='true'] [data-marketplace-wrapper='true'] { background-color: transparent !important; } © 2026 OpenRouter, IncProductChatRankingsBenchmarksAppsDiscoverModelsOriCollectionsProvidersToolsPricingBusinessEnterpriseLabsCompanyAboutBlogCareersHiringPrivacyTerms of ServiceTrust CenterSupportWorks With ORDataBrandDeveloperDocumentationAPI ReferenceDeveloper PlatformStatusAI Site MapConnectDiscordGitHubLinkedInXYouTube
Excerpt limited to ~120 words for fair-use compliance. The full article is at Openrouter.
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