Model

Step 3.7 Flash

OPEN

StepFun · Step family · released May 29, 2026

Newest StepFun release (successor to Step 3.5 Flash), adding native multimodal (image/GUI/document) support that the text-only Step 3.5 Flash lacked. Not previously in corpus (corpus's newest StepFun entry is Step-3 from 2025-07-31). No shipped 'Step 4' flagship found -- only reported as in training.

ReasoningCodingVisionFunction callingTool useAgentic

2228.0

Elo · rank #44

Parameters

198B

Active params

11B (MoE)

Context

262K tokens

Architecture

Sparse Mixture-of-Experts with 1.8B vision encoder + 196B language backbone, 198B total / 11B active

License

Apache 2.0

Languages

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API price (in/out)

$0.2 / $1.15

Modalities

text · vision

Benchmark results

Bar shows position within the tracked field; marker = field best

AIMEMath95.0%#19

best: GPT-5.2 · 100.0%

BrowseCompAgents75.8%#19

best: Kimi K3 · 91.2%

GDPval-AAAgents1415.8#19

best: Claude Fable 5 · 1932

GPQA DiamondReasoning78.4%#88

best: GPT-5.6 · 94.6%

Humanity's Last ExamReasoning49.7%#7

best: Claude Sonnet 5 · 57.4%

MMMU-ProVision75.0%#25

best: Claude Opus 4.7 · 85.5%

SWE-bench ProCoding56.3%#20

best: Claude Fable 5 · 80.0%

SWE-bench VerifiedCoding76.5%#35

best: Claude Fable 5 · 95.0%

Terminal-Bench 2.0Coding59.6%#32

best: GPT-5.6 · 88.8%

Run it locally

VRAM @ Q4

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VRAM @ FP16

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Fits on (Q4)

Multi-node cluster required

Throughput data unavailable.

Quantizations

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Step family

Elo progression across releases

Step 3.7 FlashMay 20262228.0

Resources

HFstepfun-ai/Step-3.7-Flash DOCShttps://github.com/stepfun-ai/Step-3.7-Flash APIAvailable via StepFun API

API price $0.2/$1.15 · each benchmark row carries its own source badge (see methodology)