The open model just topped the router charts. stepfun's step 5 preview took openrouter's trending…
the open model just topped the router charts. stepfun's step 5 preview took openrouter's trending slot on oct 10 and sits second on the daily board, with the open-source release set for oct 15.
five days separates a hype spike from actual weights.
Context
StepFun's Step 5 Preview, a 600B-parameter mixture-of-experts model with 1M-token context, reached OpenRouter and Vercel AI Gateway on October 8, per AI Tamer. StepFun says open weights follow on October 15, and until then it is an API model.
StepFun posted on October 9 that Step 5 Preview was on OpenRouter's New and Trending leaderboard, and a Chinese roundup says it hit number one on OpenRouter Trending a day after launch.
The OpenRouter listing, the trending spot and the October 15 open-weights date match StepFun's own posts and coverage. The trending spot dates to October 9, not October 10.
'Second on the daily board' was not seen in the pages read, so it is unsupported here, not refuted. The open weights are promised, not yet released.
'Five days separates a hype spike from actual weights' is the author's opinion.
Related work
- AI Tamer: Step 5 Preview on OpenRouter ↗Listing date and open-weights promise.
- Magica: Step 5 on OpenRouter ↗Pricing and the October 15 release.
- Launch Archive: StepFun post ↗StepFun's trending announcement.
Watch next
- Check the weights release on October 15.
Sources
- AI Tamer, Oct 9, 2026aitamer.news
- Magica, Oct 8, 2026magica.com
- Launch Archive, Oct 9, 2026launcharchive.ai
Provenance
The note above is reproduced unedited from the original post, first published on Threads on 10 October 2026 at 09:58 IST. Sources are the papers and datasets the note draws on.
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