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Step 5
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by StepFun
OPEN WEIGHTSLOCALAPILONG CONTEXTPAIDREASONING
RANKED #11 OF 328 ASSISTANTS · OVERALL #14 OF 504 RANKED · VIBE SCORE 7.0 · 5,717 VOICES ·
COPY BADGE pastes a README snippet with the rank SVG.
Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in software engineering and professional...
HAPPY9.3
21 mentions
SAD5.7
33 mentions
VIBE TRAJECTORY
26 weeks · 11,810 voices in this window
QUIETLY DEGRADING
Recent vibe and chatter are both sliding.
HOW TO USE IT
Open weights. You can use a hosted service, or download it and run it yourself, free.
WHAT THE INTERNET SAYS
People are mostly frustrated with Step 5 right now. Biggest praise: help with code. Biggest gripe: saying no too much.
2357 POSTS · 3360 COMMENTS · REDDIT · HACKER NEWS · GITHUB · DEV.TO · BLUESKY · LEMMY · DEV FORUMS · BLOG
PEOPLE LOVE
- People feel it is worth the money (7 mentions)
- Popular for coding help (7 mentions)
- Answers come back fast (3 mentions)
- Keeps up in long chats and big documents (2 mentions)
PEOPLE COMPLAIN ABOUT
- Refuses or lectures more than people like (11 mentions)
- Outages, errors, or limits get in the way (10 mentions)
- Sometimes makes things up (5 mentions)
TOPIC BY TOPIC
- PriceMOSTLY POSITIVE
7 thumbs up · 4 thumbs down
- Saying no too muchA SORE SPOT
0 thumbs up · 11 thumbs down
- Working when you need itA SORE SPOT
0 thumbs up · 10 thumbs down
- Help with codePEOPLE LOVE THIS
7 thumbs up · 2 thumbs down
- Getting facts rightA SORE SPOT
3 thumbs up · 5 thumbs down
- SpeedPEOPLE LOVE THIS
3 thumbs up · 1 thumbs down
- Long conversationsMOSTLY POSITIVE
2 thumbs up · 1 thumbs down
IN THEIR OWN WORDS
- FROM GITHUB >
“Submit: StepFun Launches Step 5 Preview, a 600-Billion-Parameter Model That Beats Gemini 3.8 Flash on Cost and Intelligence Index Score.”
LOOKING FOR AN ALTERNATIVE?
Other models the crowd has fully reviewed, starting with multimodal models like this one.
Grok 4.6
Qwen3.8 27B> SOURCES (12)
- REDDIT · 2026-09-02 · 837 UPVOTESI scraped 5.94 billion TikTok videos and 3.23 billion profiles in 3 weeks. Uploaded full dataset to Hugging Face for free. Step by step…
I scraped 5.94 billion TikTok videos and 3.23 billion profiles in 3 weeks. Uploaded full dataset to Hugging Face for free. Step by step tutorial and code below. [P]
- REDDIT · 2026-09-23 · 482 UPVOTESAnthropic CEO Dario Amodei: AI Biology Will Go From Weak To Superhuman Within A Few Years
Anthropic CEO Dario Amodei: AI Biology Will Go From Weak To Superhuman Within A Few Years
- REDDIT · 2026-10-15 · 194 UPVOTESStepfun Step-5-Preview released! (600B/27B-1M Context)
Stepfun Step-5-Preview released! (600B/27B-1M Context)
- BLUESKY · 2026-10-09 · 193 UPVOTES5/ "In other words, one shouldn't assume that no one had thought to attack data centres before; it is simply that Putin
5/ "In other words, one shouldn't assume that no one had thought to attack data centres before; it is simply that Putin
- HACKER NEWS · 2026-10-08 · 146 UPVOTESStep 5 Preview, a 1M-context MoE from StepFun, shows up on OpenRouter
Step 5 Preview, a 1M-context MoE from StepFun, shows up on OpenRouter
- REDDIT · 2026-09-10 · 139 UPVOTESWe just solved a Millennium Prize problem/s using 2025/2026-era compute. Imagine what 2027/2028/2029 looks like.
We just solved a Millennium Prize problem/s using 2025/2026-era compute. Imagine what 2027/2028/2029 looks like.
- LEMMY · 2026-10-08 · 127 UPVOTESKick-Ass Women from History #10: Margaret Hamilton
Kick-Ass Women from History #10: Margaret Hamilton
- REDDIT · 2026-09-19 · 81 UPVOTESStepFun joins the frontier: a previously non-frontier Chinese lab (StepFun) released a Kimi K3-level model, 3 times cheaper per Artificial…
StepFun joins the frontier: a previously non-frontier Chinese lab (StepFun) released a Kimi K3-level model, 3 times cheaper per Artificial Analysis
- BLUESKY · 2026-10-09 · 75 UPVOTESWanted to share that my settlement visa has officially been approved! It was the final step to securing my ability to st
Wanted to share that my settlement visa has officially been approved! It was the final step to securing my ability to st
- REDDIT · 2026-09-02 · 67 UPVOTESGood, cheap, token hungry
Good, cheap, token hungry
- BLUESKY · 2026-10-08 · 60 UPVOTES5/5 Yoon Suk Yeol declared Martial Law in South Korea on December 3rd 2024, but is now in prison for "heading an insurre
5/5 Yoon Suk Yeol declared Martial Law in South Korea on December 3rd 2024, but is now in prison for "heading an insurre
- HACKER NEWS · 2026-09-20 · 57 UPVOTESStep 5 Preview: Advancing the Pareto Frontier
Step 5 Preview: Advancing the Pareto Frontier