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Step 5 Preview

StepFunOpen weightsReasoningProvisionalReleased Sep 20, 2026Input: text, image, video
Compare with Qwen3.8 MaxSource scores ↗OpenRouter ↗
Overall score
69.6
Rank 19 of 222 · 59.9–79.3
Context window
1M
1,000,000 tokens
Price per 1M tokens
$1.00 in · $2.70 out
Source: BenchLM
Blended price
$1.43
3:1 input:output tokens
Output speed
—
Not measured yet

Category scores

Scores per capability area with the model's rank among ranked models in that category.

  1. 1Reasoning82.5
  2. 2Agentic & tool use78.5
  3. 3Coding77.6
  4. 4Multimodal#2474.6
  5. 5Knowledge70.6
Higher is better. #N is the model's rank in that category, where it is eligible to be ranked.

Benchmark results (21)

As reported in system cards, papers and public evaluations. Position compares this model with every other model reporting the same benchmark.

Agentic & tool use

Terminal-Bench 2.185.0#17 of 68
BrowseComp88.7#9 of 50
MCP Atlas85.6#4 of 42
JobBench59.0#9 of 34
CyberGym84.7#6 of 25
AutomationBench44.0#12 of 25
Toolathlon-Verified74.1#7 of 22
Terminal-Bench 4.033.30#15 of 18
Agents' Last Exam29.5#10 of 17
Hermes Index32.8#14 of 16
Hermes Bench69.2#12 of 16
APEX-Agents37.8#3 of 8
DRACO83.3#4 of 6

Coding

DeepSWE67.7#23 of 50
SciCode58.9#1 of 23
ProgramBench80.5#4 of 15
MLS-Bench Lite40.5#3 of 4

Multimodal

MMMU-Pro76.0#29 of 48
OfficeQA Pro60.3#8 of 13

Knowledge

HLE46.5#22 of 69

Pricing by source

USD per 1M tokens.

SourceInputOutputCached in
List price (BenchLM)$1.00$2.70$0.050
OpenRouter stepfun/step-5-preview$1.00$2.70$0.10

StepFun lists `step-5-preview` at $1.00 per million cache-miss input tokens, $0.05 per million cache-hit input tokens, and $2.70 per million output tokens. Output tokens include both the reasoning process and final answer. StepFun now publishes self-hostable FP8 and BF16 weights under StepFun Model License 1.0. These prices describe the hosted API; running the weights requires hardware.

Arena ratings

Human-preference ratings from LMArena. Best-rated variant shown.

Text1441#73 · 7.1K votes
WebDev (coding)(High)1567#39 · 4.7K votes
Vision1265#49 · 1.6K votes

Open weights

From the Hugging Face repository.

Parameters
604B
Licence
other
Downloads (30 days)
1.8K

Speed

Measured by us through OpenRouter (median of trials).

Not measured yet.

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