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| 3 models | stepfunStepFun: Step 3.7 FlashRemove × | stepfunStepFun: Step 3.5 FlashRemove × | openaiOpenAI: GPT-6.1 SolRemove × |
|---|---|---|---|
| What’s different | Step 3.7 Flash is StepFun's latest high-efficiency multimodal Mixture-of-Experts model. It pairs a 196B-parameter language backbone with a vision encoder for native image and video understanding, activating… | Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token.... | Requires Responses API for tools; offers Ultrafast inference with US or EU data residency. |
| Date | May 23, 2026Listed | Jan 29, 2026Listed | Sep 29, 2026Released |
API prices USD · provider configuration shown below | |||
| Listed rate | $0.20 in / $1.15 out/ 1M tokensdeepinfra · via Hugging Face · all routes ↗ | $0.10 in / $0.30 out/ 1M tokensdeepinfra · via Hugging Face · all routes ↗ | $2.00 in / $10.00 out/ 1M tokensExperiential · all routes ↗Standard list rate |
| Provider endpoints | 5 endpoints → | 4 endpoints → | 10 endpoints → |
Benchmarks Each result retains its evaluation configuration | |||
| AA Intelligence ↗4.3.2 | Not reported | Not reported | 51.83 ↗Effort: max · MaxIndependent result |
| AA-Briefcase ↗1.1 | Not reported | Not reported | 1,557 ↗Effort: max · MaxIndependent result |
| GDPval-AA ↗2.1 | Not reported | Not reported | 1,593.85 ↗Effort: max · MaxIndependent result |
| AutomationBench-AA ↗AA Index 4.3.2 collection | Not reported | Not reported | 64.87% ↗Effort: max · MaxIndependent result |
| Terminal-Bench 4.0 · AA ↗ | Not reported | Not reported | 56.06% ↗Effort: max · MaxHarness unreportedIndependent result |
| SciCode ↗AA Index 4.3.2 collection | Not reported | Not reported | 54.17% ↗AA · Under reviewEffort: max · MaxIndependent result |
| Humanity’s Last Exam ↗AA Index 4.3.2 collection | Not reported | Not reported | 52.92% ↗Effort: max · MaxIndependent result |
| GDP.pdf ↗AA Index 4.3.2 collection | Not reported | Not reported | 31% ↗Effort: max · MaxIndependent result |
| CritPt ↗AA Index 4.3.2 collection | Not reported | Not reported | 31.71% ↗AA · Under reviewEffort: max · MaxIndependent result |
| AA-Omniscience ↗AA Index 4.3.2 collection | Not reported | Not reported | 41.53 ↗Effort: max · MaxIndependent result |
| AA-LCR ↗1.1 | Not reported | Not reported | 83% ↗Effort: max · MaxIndependent result |
| LiveBench ↗2.0 · 2026-10-14 (dataset 2026-09-02) | Not reported | Not reported | 85.41% ↗Effort: max · single run · equal mean of 7 suitesIndependent result |
| LiveBench Design ↗2.0 · 2026-10-14 (dataset 2026-09-02) | Not reported | Not reported | 82.1% ↗Effort: max · single runIndependent result |
| LiveBench Research ↗2.0 · 2026-10-14 (dataset 2026-09-02) | Not reported | Not reported | 83.5% ↗Effort: max · single runIndependent result |
| LiveBench Browser Use ↗2.0 · 2026-10-14 (dataset 2026-09-02) | Not reported | Not reported | 88% ↗Effort: max · single runIndependent result |
| LiveBench Coding ↗2.0 · 2026-10-14 (dataset 2026-09-02) | Not reported | Not reported | 96% ↗Effort: max · single runIndependent result |
| LiveBench Agentic ↗2.0 · 2026-10-14 (dataset 2026-09-02) | Not reported | Not reported | 73% ↗Effort: max · single runIndependent result |
| LiveBench Data Analysis ↗2.0 · 2026-10-14 (dataset 2026-09-02) | Not reported | Not reported | 82.7% ↗Effort: max · single runIndependent result |
| LiveBench Reasoning ↗2.0 · 2026-10-14 (dataset 2026-09-02) | Not reported | Not reported | 92.6% ↗Effort: max · single runIndependent result |
Specifications | |||
| Context window | 262.1K | 262.1K | 1.1M |
| Max output | 230.4K | 65.5K | 128K |
| Parameters | — | — | — |
| Tool calling | Supported | Supported | Supported |
| Structured output | Supported | Supported | Supported |
| Image input | Supported | Not reported | Supported |
| Video input | Supported | Not reported | Not reported |
| Reasoning | Supported | Supported | Supported |
| Prompt caching | Supported | Not reported | Supported |
| Open weights | Supported | Supported | Not reported |