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StepFun: Step 3.7 Flash

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stepfun/step-3.7-flash

Step 3.7 Flash is StepFun's latest high-efficiency multimodal Mixture-of-Experts model.

Context
256K
Input
$0.20 / 1M
Output
$1.15 / 1M
Released
May 28, 2026
Modalities
textimagevideo→text
Strongest atAgentic & Tools top 3%

Benchmarks

Scores on standardized evaluations. Higher is better — and rank shows where Step 3.7 Flash lands among all models tracked on Model Beat.

55.0
Intelligence Index
Artificial Analysis
55th percentile of tracked models
32.0
Coding Index
Artificial Analysis
32nd percentile of tracked models
97.0
Agentic Index
Artificial Analysis
97th percentile of tracked models

Reasoning

2 evals
GPQA Diamond80.9%

Graduate-level scientific reasoning

Humanity's Last Exam19.9%

Frontier of human expert knowledge

Coding

1 evals
SciCode40.0%

Scientific research coding

Agentic & Tools

1 evals
τ²-bench98.5%

Tool-agent-user reliability

Compare Step 3.7 Flash with

Step 3.7 Flash vs Claude Fable 5Step 3.7 Flash vs GPT-5.5Step 3.7 Flash vs Gemini 3.1 ProStep 3.7 Flash vs Muse SparkStep 3.7 Flash vs Qwen 3.7 Max

Frequently asked questions

What is Step 3.7 Flash?

Step 3.7 Flash is StepFun's latest high-efficiency multimodal Mixture-of-Experts model.

Who created Step 3.7 Flash?

Step 3.7 Flash is an AI model developed by StepFun, released May 28, 2026.

How much does Step 3.7 Flash cost?

Step 3.7 Flash is priced at $0.20 per million input tokens and $1.15 per million output tokens (representative pricing via OpenRouter).

What is Step 3.7 Flash's context window?

Step 3.7 Flash supports a context window of up to 256K tokens.

How does Step 3.7 Flash perform on benchmarks?

On standardized evaluations tracked by Epoch AI, Step 3.7 Flash scores 98.5% on τ²-bench, 19.9% on Humanity's Last Exam, 40.0% on SciCode.

Benchmark data from Epoch AI (CC BY) and Artificial Analysis; pricing, specs & descriptions from OpenRouter. Data updated July 2026.