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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 open-weights AI model, released May 29, 2026. It costs $0.20/M input and $1.15/M output tokens, and handles a 262K-token context window. Its strongest use case is agentic & tools, where it ranks in the 98th percentile of the models Model Beat tracks.

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

Context
262K
Input
$0.20 / 1M
Output
$1.15 / 1M
Released
May 29, 2026
Modalities
textimagevideo→text
Strongest atAgentic & Tools top 2%

Benchmarks

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

52.0
Intelligence Index
Artificial Analysis
52nd percentile of tracked models
29.0
Coding Index
Artificial Analysis
29th percentile of tracked models
98.0
Agentic Index
Artificial Analysis
98th percentile of tracked models

Reasoning

2 evals
GPQA Diamond80.9%

Graduate-level scientific reasoning

Humanity's Last Exam21.4%

Frontier of human expert knowledge

Coding

1 evals
SciCode40.0%

Scientific research coding

Agentic & Tools

1 evals
τ²-bench98.5%

Tool-agent-user reliability

Changelog

5
  • Step 3.7 Flash: Humanity's Last Exam improved from 19.9% to 21.4% (+8%)benchmark · Aug 6, 2026
  • Step 3.7 Flash: context window changed from 256,000 to 262,144 tokenscontext · Jul 21, 2026
  • Step 3.7 Flash: cheapest credible provider via StepFun now $0.2 per 1M input tokens (was $0.19, +5%)cheapest provider · Jul 19, 2026
  • Step 3.7 Flash: cheapest credible provider via Ambient now $0.19 per 1M input tokens (was $0.2, -5%)cheapest provider · Jul 17, 2026
  • Step 3.7 Flash (StepFun) added to the tracker.tracked · Jul 1, 2026

Compare Step 3.7 Flash with

Step 3.7 Flash vs Claude Fable 5Step 3.7 Flash vs GPT-5.6 SolStep 3.7 Flash vs Kimi K3Step 3.7 Flash vs Grok 4.6Step 3.7 Flash vs Gemini 3.1 Pro

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 29, 2026.

How much does Step 3.7 Flash cost?

Step 3.7 Flash's list price from StepFun is $0.20 per million input tokens and $1.15 per million output tokens.

What is Step 3.7 Flash's context window?

Step 3.7 Flash supports a context window of up to 262K 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, 21.4% on Humanity's Last Exam, 40.0% on SciCode.

Is Step 3.7 Flash open source?

Step 3.7 Flash is released with open weights (Open weights (unrestricted)), so the model can be downloaded and self-hosted.

Benchmark data from Epoch AI (CC BY) and Artificial Analysis; pricing, specs & descriptions from OpenRouter. Data updated Aug 20, 2026.