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Models/StepFun

Step 3.7 Flash

Newer StepFun flash model for faster agents, coding, and multimodal prompts

Source-linked Open weights Released 2026-05-29
API data Report
Input modalitiesT
Output modalitiesT
Input price$0.185/1M tokens
Output price$1.11/1M tokens
Context window256K
Max output256K
Overview

Capabilities and specifications

✓ Reasoning Yes
✓ Tool calling Yes
? Structured output Unknown
✓ Attachments Yes
✓ Vision input Yes
✓ Open weights Yes
Creator
StepFun
Model family
Not documented
Knowledge cutoff
2026-03-01
License
Not documented
Release date
2026-05-29
Model ID
stepfun/step-3.7-flash
Inference availability

Provider pricing and availability

Provider-specific identifiers, limits, and prices per million tokens.

Report a price
Providers offering Step 3.7 Flash
ProviderProvider model IDContextInputOutputCache readCapabilitiesSource
StepFun Step Plan (Global) step-3.7-flash 256K Not listed Not listed - ReasoningTools Docs
Nvidia stepfun-ai/step-3.7-flash 256K Not listed Not listed - ReasoningTools Docs
UnoRouter step-3.7-flash:free 256K Not listed Not listed - ReasoningTools Docs
StepFun Step Plan (China) step-3.7-flash 256K Not listed Not listed - ReasoningTools Docs
StepFun (Global) step-3.7-flash 256K $0.185 $1.11 $0.037 ReasoningTools Docs
StepFun (China) step-3.7-flash 256K $0.185 $1.11 $0.037 ReasoningTools Docs
Ambient stepfun/step-3.7-flash 262.144K $0.19 $1.14 $0.03 ReasoningToolsJSON Docs
Vercel AI Gateway stepfun/step-3.7-flash 256K $0.2 $1.15 $0.04 ReasoningTools Docs
Hugging Face stepfun-ai/Step-3.7-Flash 262.144K $0.2 $1.15 - ReasoningTools Docs
ZenMux stepfun/step-3.7-flash 256K $0.2 $1.15 - ReasoningTools Docs
EmpirioLabs AI step-3-7-flash 256K $0.2 $1.15 $0.04 ReasoningToolsJSON Docs
OpenRouter stepfun/step-3.7-flash 262.144K $0.2 $1.15 $0.04 ReasoningToolsJSON Docs

Capability badges appear only when the provider catalog explicitly lists support.

Serving quality

Performance and reliability

Observed serving measurements stay separate from model specifications and are never estimated from price or model size.

Throughput Not reported

Generation speed; higher is faster.

Latency / TTFT Not reported

Time until the first output token arrives.

Uptime Not reported

Successful requests over a measured period.

Performance varies by inference provider, region, and load. Provider-level measurements appear only when a source reports them.

Published evaluations

Benchmarks

Raw results remain attached to their original source and version.

Benchmark registry
Agentic Index - Unversioned - indexTop 8 reported models
Claude Opus 5
55.3
GPT-5.6 Sol
54.0
Anthropic: Claude Fable 5 (batch)
52.8
Claude Fable 5
52.8
Kimi K3
50.1
GPT-5.6 Terra
47.4
Anthropic: Claude Opus 4.8 (batch)
47.2
Step 3.7 Flash
21.5
Artificial Analysis Coding Index - Unversioned - indexTop 7 reported models
GPT-5-Codex
38.9
Step 3.7 Flash
37.1
Step 3.5 Flash 2603
34.6
Gemini 2.5 Pro
32.0
Step 3.5 Flash
31.6
GLM-4.6
29.5
Qwen3 Max
26.4
BrowseComp - Unversioned - accuracyTop 8 reported models
GPT-5.6 Sol
90.4
GPT-5.5 Pro
90.1
GPT-5.4 Pro
89.3
GPT-5.6 Terra
87.5
Claude Sonnet 5
84.7
GPT-5.5
84.4
MiniMax-M3
83.5
Step 3.7 Flash
75.8
ClawEval - 1.1 - pass^3Top 1 reported models
Step 3.7 Flash
67.1
Coding Index - Unversioned - indexTop 8 reported models
Claude Opus 5
78.0
GPT-5.6 Sol
77.4
GPT-5.6 Terra
76.7
Anthropic: Claude Fable 5 (batch)
76.5
Claude Fable 5
76.5
Kimi K3
76.2
OpenAI: GPT-5.5 (batch)
74.9
Step 3.7 Flash
39.6
Design Arena: 3d - Unversioned - eloTop 8 reported models
Kimi K3
1456.0
Claude Opus 5
1384.0
Anthropic: Claude Fable 5 (batch)
1373.0
Claude Fable 5
1373.0
Z.ai: GLM 5.2
1366.0
Z.ai: GLM 5.1
1336.0
Anthropic: Claude Opus 4.6 (batch)
1332.0
Step 3.7 Flash
1178.0
Design Arena: asciiart - Unversioned - eloTop 8 reported models
Anthropic: Claude Fable 5 (batch)
1364.0
Claude Fable 5
1364.0
Anthropic: Claude Opus 4.7 (batch)
1324.0
Anthropic: Claude Opus 4.7
1324.0
Muse Spark 1.1
1322.0
Google: Gemini 3.1 Pro Preview (batch)
1309.0
Gemini 3.1 Pro Preview
1309.0
Step 3.7 Flash
1194.0
Design Arena: codecategories - Unversioned - eloTop 8 reported models
Kimi K3
1418.0
Claude Opus 5
1358.0
Z.ai: GLM 5.2
1346.0
Anthropic: Claude Fable 5 (batch)
1340.0
Claude Fable 5
1340.0
Anthropic: Claude Opus 4.6 (batch)
1324.0
Anthropic: Claude Opus 4.6
1324.0
Step 3.7 Flash
1203.0
Design Arena: dataviz - Unversioned - eloTop 8 reported models
Kimi K3
1382.0
Claude Opus 5
1378.0
Z.ai: GLM 5.1
1366.0
Google: Gemini 3.6 Flash (batch)
1350.0
Gemini 3.6 Flash
1350.0
Anthropic: Claude Fable 5 (batch)
1349.0
Claude Fable 5
1349.0
Step 3.7 Flash
1204.0
Design Arena: gamedev - Unversioned - eloTop 8 reported models
Anthropic: Claude Fable 5 (batch)
1393.0
Claude Fable 5
1393.0
Z.ai: GLM 5.2
1358.0
Anthropic: Claude Sonnet 5 (batch)
1352.0
Claude Sonnet 5
1352.0
OpenAI: GPT-5.5 (batch)
1345.0
GPT-5.5
1345.0
Step 3.7 Flash
1204.0
Design Arena: svg - Unversioned - eloTop 8 reported models
Anthropic: Claude Fable 5 (batch)
1351.0
Claude Fable 5
1351.0
Google: Gemini 3.1 Pro Preview (batch)
1335.0
Gemini 3.1 Pro Preview
1335.0
Google: Gemini 3.5 Flash (batch)
1296.0
Gemini 3.5 Flash
1296.0
Anthropic: Claude Opus 4.6 (batch)
1276.0
Step 3.7 Flash
1117.0
Design Arena: uicomponent - Unversioned - eloTop 8 reported models
Kimi K3
1413.0
Claude Opus 5
1406.0
Anthropic: Claude Fable 5 (batch)
1350.0
Claude Fable 5
1350.0
Anthropic: Claude Opus 4.7 (batch)
1339.0
Anthropic: Claude Opus 4.7
1339.0
Z.ai: GLM 5.2
1334.0
Step 3.7 Flash
1202.0
Design Arena: website - Unversioned - eloTop 8 reported models
Kimi K3
1375.0
Claude Opus 5
1343.0
Z.ai: GLM 5.2
1340.0
Anthropic: Claude Fable 5 (batch)
1323.0
Claude Fable 5
1323.0
xAI: Grok 4.5
1323.0
Google: Gemini 3.6 Flash (batch)
1322.0
Step 3.7 Flash
1212.0
GDPval - Unversioned - wins or tiesTop 6 reported models
GPT-5.5
84.9
GPT-5.4
83.0
GPT-5.5 Pro
82.3
GPT-5.4 Pro
82.0
Nemotron 3 Ultra 550B A55B
46.7
Step 3.7 Flash
45.8
Humanity's Last Exam - Unversioned - accuracyTop 8 reported models
Claude Fable 5
64.5
Muse Spark 1.1
62.1
GPT-5.4 Pro
58.7
Claude Opus 4.8
57.9
GPT-5.5 Pro
57.2
Claude Opus 4.7
54.7
GPT-5.5
52.2
Step 3.7 Flash
47.2
Intelligence Index - Unversioned - indexTop 8 reported models
Claude Opus 5
60.7
Anthropic: Claude Fable 5 (batch)
59.9
Claude Fable 5
59.9
GPT-5.6 Sol
58.9
Kimi K3
57.1
Anthropic: Claude Opus 4.8 (batch)
55.7
Anthropic: Claude Opus 4.8
55.7
Step 3.7 Flash
30.3
SWE-Bench Pro - Unversioned - resolve rateTop 8 reported models
Claude Fable 5
80.3
Claude Opus 4.8
69.2
Grok 4.5
64.7
GPT-5.6 Sol
64.6
Claude Opus 4.7
64.3
GPT-5.6 Terra
63.4
Claude Sonnet 5
63.2
Step 3.7 Flash
56.3
SWE-Bench Verified - Unversioned - resolvedTop 8 reported models
Claude Fable 5
95.0
Claude Opus 4.8
88.6
Claude Sonnet 5
85.2
DeepSeek V4 Pro
80.6
Qwen3.7 Max
80.4
Kimi K2.6
80.2
DeepSeek V4 Flash
79.0
Step 3.7 Flash
76.5
SciCode - Unversioned - percent correctTop 7 reported models
Gemini 2.5 Pro
42.8
GPT-5-Codex
40.9
Step 3.5 Flash
40.4
Step 3.7 Flash
40.0
Gemini 2.5 Flash
39.4
Step 3.5 Flash 2603
38.5
GLM-4.6
38.4
Terminal-Bench - 2.1 - success rateTop 8 reported models
GPT-5.6 Sol
88.8
Claude Fable 5
88.0
GPT-5.6 Terra
87.4
GPT-5.6 Luna
84.7
Grok 4.5
83.3
Muse Spark 1.1
80.0
LongCat-2.0
70.8
Step 3.7 Flash
59.6
Terminal-Bench Hard - Unversioned - success rateTop 7 reported models
GPT-5-Codex
37.9
Step 3.7 Flash
35.6
Step 3.5 Flash 2603
32.6
Step 3.5 Flash
27.3
Gemini 2.5 Pro
26.5
GLM-4.6
25.0
GLM-4.5
22.0
Toolathlon - Unversioned - success rateTop 6 reported models
GPT-5.6 Sol
58.0
Gemini 3.5 Flash
56.5
GPT-5.5
55.6
GPT-5.6 Luna
53.4
GPT-5.6 Terra
53.1
Step 3.7 Flash
49.5
Catalog activity

Recent record changes

Detected changes from successful source imports.

Full change log
Price Completion1.15 → 1.11
Price Prompt0.19999999999999998 → 0.185
Price Completion1.11 → 1.15
Price Prompt0.185 → 0.19999999999999998
Price Completion1.15 → 1.11
Price Prompt0.19999999999999998 → 0.185
Price Completion1.11 → 1.15
Price Prompt0.185 → 0.19999999999999998
Public API

Use this record

Fetch the complete source-linked model record without an API key.

API documentation
Endpoint
GET https://www.modelbench.lol/api/v1/models/stepfun/step-3.7-flash
curl
curl "https://www.modelbench.lol/api/v1/models/stepfun/step-3.7-flash"