Step 3.7 Flash
- Family
- Step
- Released
- 2026-05-29
- Context
- 256K
- Parameters
- 198B (11B active)
- Architecture
- Mixture of Experts
- Specialization
- general
- Openness
- Proprietary
- License
- ProprietaryCommercial use: conditional
- Weights
- Not released
- Code
- Unknown
- Training
- Pretrained
Cheapest of 3 routes · OpenRouter
About
Step 3.7 Flash is StepFun's open-weights multimodal Mixture-of-Experts model for agentic coding, tool use, long-context reasoning, image understanding, and video understanding. It combines a 196B-parameter language backbone with a 1.8B-parameter vision encoder, activates about 11B parameters per token, supports a 256K-token context window, and exposes low, medium, and high reasoning levels for speed/depth tradeoffs. StepFun reports leading open-model results on ClawEval-1.1, SimpleVQA with Search, and SWE-bench Pro at launch. Weights are available on Hugging Face under Apache 2.0.
Provider price ladder
Compare all 3Compare API pricing across 3 providers for input and output tokens, batch, and cached reads when available.
| Provider | Input / 1M | Output / 1M | Cache | Route |
|---|---|---|---|---|
| OpenRouter | $0.200 | $1.15 | - | Serverless |
| StepFun | $0.200 | $1.15 | read $0.040 | Serverless |
| NVIDIA NIM | - | - | - | ProvisionedPartial |
Available via routers & gateways(1)
Capabilities
Benchmark peer barsfor Coding
Benchmark scores(14)
| Benchmark | Score | Version | Evaluation | Source |
|---|---|---|---|---|
| ClawEval-1.1 | 67.1 | 1st among open models at releaseObserved 2026-05-29 | — | Source |
| SimpleVQA with Search Tool | 79.2 | 1st at release (GPT-5.5: 79.1)Observed 2026-05-29 | — | Source |
| V* with Python | 95.3 | 2nd at release (Kimi K2.6: 96.9)Observed 2026-05-29 | — | Source |
| SWE-bench Pro | 56.3 | 2nd at release (Claude Opus 4.7: 64.3, GPT-5.5: 58.6)Observed 2026-05-29 | — | Source |
| Terminal-Bench 2.1 | 59.5 | Comparison: Step 3.5 Flash 53.37%, DeepSeek V4 Flash 62.0%, Gemini 3.5 Flash 76.2%, GPT-5.5 82.7%, Claude Opus 4.7 69.4%Observed 2026-05-29 | — | Source |
| Toolathlon | 49.5 | —Observed 2026-05-29 | — | Source |
| Humanity's Last Exam | 47.2 | —Observed 2026-05-29 | — | Source |
| GDPval-AA | 45.8 | —Observed 2026-05-29 | — | Source |
| WorldVQA | 58.1 | Comparison: Kimi K2.6 55.98%Observed 2026-05-29 | — | Source |
| HR-Bench 4K | 89.1 | Comparison: Kimi K2.6 91.25%Observed 2026-05-29 | — | Source |
| Android Daily | 61.9 | Comparison: Gemini 3 Flash 63.21%Observed 2026-05-29 | — | Source |
| DeepSearchQA | 92.8 | —Observed 2026-05-29 | — | Source |
| BrowseComp | 75.8 | From official StepFun blog post (accuracy%)Observed 2026-06-07 | — | Source |
| ResearchRubrics | 71.7 | —Observed 2026-05-29 | — | Source |
Migration checks
No linked migration route is available for this model yet.
API versions
step-3.7-flashCompare Step 3.7 Flash with other models
Comparison and alternatives
Browse all comparisons →Cheapest of 3 routes · OpenRouter