Stepfun
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...
Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters).
OpenRouter
Price record: 2026-10-24. Source: openrouter.
No current subscription pricing is tracked for this model.
Confirm this specific model, usage limits, and billing terms with the provider. A subscription does not automatically include API credits.
No login needed to compare. Prices are in USD; provider charges are separate from AI Market Cap plans. Context length, caching, tools, taxes, and regional terms can change the final cost. Open weights do not mean free hosting.
---
Quality Score
1250
Arena ELO
600B
Parameters
1M
Context
This measures the amount of verifiable public evidence we have, not how capable the model is. A missing field means it has not been verified yet, not that its value is zero.
15 of 22 public signals
Use this section to answer one simple question first: how much outside evidence do we have that this model performs well? Structured benchmark scores appear first, then official provider evidence, then live arena signal.
This model has normalized benchmark rows, so scores here are directly comparable across benchmark sources.
Sign in to join the discussion
0
Downloads
0
Likes
Oct 2026
Released
4/5 signals
3/4 signals
3/5 signals
1/4 signals
4/4 signals
Parameters
600B
Training compute
Not reported
Dataset scale
Not reported
Base model
Not reported
Source-reported access: API access · Likely confidence
Gaps we are still tracking
These are recent benchmark or leaderboard claims from official provider sources. They are useful for freshness and context, but they are not treated the same as normalized independent benchmark rows.
Step 5 Preview Benchmark Update
Quality: 43.7/100 | Price: $1.425/M tokens | Output: 222.613 tok/s | HumanEval: 0.589%
View sourceStep 5 Preview Benchmark Update
Quality: 43.7/100 | Price: $1.425/M tokens | Output: 216.856 tok/s | HumanEval: 0.589%
View sourceStep 5 Preview Benchmark Update
Quality: 43.7/100 | Price: $1.425/M tokens | Output: 102.553 tok/s | HumanEval: 0.589%
View sourceStep 5 Preview Benchmark Update
Quality: 43.7/100 | Price: $1.425/M tokens | Output: 92.243 tok/s | HumanEval: 0.589%
View sourceStep 5 Preview Benchmark Update
Quality: 43.7/100 | Price: $1.425/M tokens | Output: 86.483 tok/s | HumanEval: 0.589%
View sourceModels | Try NVIDIA NIM APIs
Black-forest-labs Downloadable flux-3-image-klein FLUX 3 Image Klein is a state-of-the-art open-weight image generation and editing model NVIDIA Free Endpoint nemotron-3.5-super-vl-120b-a12b Nemotron 3.5 Super early-access reasoning model for agentic, coding, tool-calling, and multimodal workloads Stepfun-ai Free Endpoint Step 5 Preview Preview of StepFun's Step 5: ~600B-total / 27B-active multimodal MoE (text and image in, text out) with 1M context, reasoning and tool c
View source1250
ELO Score
1232 - 1268
95% Confidence
+/-18 points
1.1K
Battles
Oct 12, 2026
Last Updated