# stepfun

[stepfun.com](https://stepfun.com/)

阶跃星辰于2023年4月成立，以“智能阶跃，十倍每个人的可能”为使命。阶跃星辰坚定自研超级模型，积极布局算力、数据等关键资源，发挥算法和人才优势，已完成 Step-1 千亿参数语言大模型和 Step-1V 千亿多模态大模型的研发，在图像理解、多轮指令跟随、数学能力、逻辑推理、文本创作等方面性能达到业界领先水平。.

Researched 2026-11-11

## Products

### Step 5 Preview

Step 5 Preview Our frontier model for complex work and agentic tasks.

[阶跃星辰](https://stepfun.com/) · [Product page](https://stepfun.com/step-5-preview)

## Customer feedback

[Stepfun Step 3.5 Flash? : r/SillyTavernAI](https://reddit.com/r/SillyTavernAI/comments/1rbhcl2/stepfun_step_35_flash)

Excerpt: Has anyone used or tried this model? I see it's free on OR, and I see it as a cheap option on other platforms as well. I tried one message and it seems ...

[Reddit](https://reddit.com/r/SillyTavernAI/comments/1rbhcl2/stepfun_step_35_flash)

[Models like Stepfun?](https://reddit.com/r/JanitorAI_Refuges/comments/1w1d05c/models_like_stepfun)

Excerpt: prompts that can at least make the models produce longer sentences like Stepfun.

2026-08-29T04:49:00.000Z · [Reddit](https://reddit.com/r/JanitorAI_Refuges/comments/1w1d05c/models_like_stepfun)

[StepFun 3.7 Flash](https://reddit.com/r/LocalLLaMA/comments/1tqloii/stepfun_37_flash)

Excerpt: StepFun dropped Step 3.7 Flash, 196B total / 11B active MoE, runs locally on 128GB RAM

2026-05-29T00:32:52.000Z · [Reddit](https://reddit.com/r/LocalLLaMA/comments/1tqloii/stepfun_37_flash)

[Stepfun Step-5-Preview released! (600B/27B-1M Context)](https://reddit.com/r/LocalLLaMA/comments/1x6dx5x/stepfun_step5preview_released_600b27b1m_context)

Excerpt: Step 5 Preview is StepFun's flagship model for agentic work.

2026-10-15T06:04:04.000Z · [Reddit](https://reddit.com/r/LocalLLaMA/comments/1x6dx5x/stepfun_step5preview_released_600b27b1m_context)

[\[repost for legal reasons\] I hate Stepfun and its stupid censorship](https://reddit.com/r/openrouter/comments/1s9hoom/repost_for_legal_reasons_i_hate_stepfun_and_its)

2026-04-01T11:20:56.000Z · [Reddit](https://reddit.com/r/openrouter/comments/1s9hoom/repost_for_legal_reasons_i_hate_stepfun_and_its)

[StepFun joins the frontier: a previously non-frontier Chinese lab (StepFun) released a Kimi K3-level model, 3 times cheaper per Artificial Analysis](https://reddit.com/r/singularity/comments/1wkd8hx/stepfun_joins_the_frontier_a_previously)

Excerpt: StepFun releases Step 5 Preview, scoring equally to Kimi K3 (max) (44), at 1/3 the price, and stands firmly on the Pareto line of cost/intelligence.

2026-09-19T05:18:45.000Z · [Reddit](https://reddit.com/r/singularity/comments/1wkd8hx/stepfun_joins_the_frontier_a_previously)

[Stepfun 3.7 Flash is very good : r/LocalLLaMA](https://reddit.com/r/LocalLLaMA/comments/1tss9nq/stepfun_37_flash_is_very_good)

Excerpt: Stepfun 3.7 still isn't GLM quality, but the balance of prefill/decode/RAM/understanding feels like the best I have so far.

[Reddit](https://reddit.com/r/LocalLLaMA/comments/1tss9nq/stepfun_37_flash_is_very_good)

[StepFun Step 5 Preview scores 44 on Intelligence Index at ...](https://aicoder.com/news/news-20260922-step-5-preview-aa-index)

Excerpt: Artificial Analysis: StepFun Step 5 Preview scores 44 on Intelligence Index at ~2.8x lower cost than Kimi K3. Artificial AnalysisVerified. @ ...

[Web](https://aicoder.com/news/news-20260922-step-5-preview-aa-index)

[Step 5 Preview, a 1M-context MoE from StepFun, shows up ...](https://news.ycombinator.com/item?id=50007764)

Excerpt: Step 5 Preview, a 1M-context MoE from StepFun, shows up on ... Stepfun made a close to SOTA model with 3.5. They got overtaken quickly ...

[Web](https://news.ycombinator.com/item?id=50007764)

## Marketing & Ads

Ads have not been collected for this company.

## New pages

Archive dates show when an archived copy was found, not when the page was published.

### [阶跃星辰](https://stepfun.com/step-3.5-flash)

- First archived 2026-10-02 — [Internet Archive · earliest successful HTML capture](https://web.archive.org/web/20261002004242/https://www.stepfun.com/step-3.5-flash)

### [阶跃星辰](https://stepfun.com/step-3.7-flash)

- First archived 2026-09-26 — [Internet Archive · earliest successful HTML capture](https://web.archive.org/web/20260926050806/https://www.stepfun.com/step-3.7-flash)

### [阶跃星辰](https://stepfun.com/step-5-preview)

- First archived 2026-09-20 — [Internet Archive · earliest successful HTML capture](https://web.archive.org/web/20260920035731/https://www.stepfun.com/step-5-preview)

## Contact

No contact details found on the pages scanned.

## Sources

1. [阶跃星辰](https://stepfun.com/) — stepfun.com · Retrieved 2026-11-11

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JTMWYD — Just tell me what you do.