# Hy4 preview vs Step 3.7 Flash

> Side-by-side benchmark comparison for Hy4 preview and Step 3.7 Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/hy4-preview-vs-step-3-7-flash
- Last updated: October 13, 2026

- Shared sourced benchmarks: 4
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Hy4 preview leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- Hy4 preview has the higher overall point estimate 60.86 to 43.48. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in coding, where the averages are 57.1 for Hy4 preview and 30.6 for Step 3.7 Flash.
- The biggest single benchmark swing is Terminal-Bench 2.1 in Agentic, with scores of 85.4% and 59.5%.
- Hy4 preview is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Hy4 preview also has the larger context window at 1M.

## Model Snapshot

| Property | Hy4 preview | Step 3.7 Flash |
|----------|----------|----------|
| Creator | Tencent | StepFun |
| Type | Open Weight | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 256K |
| Overall Score | 60.86 | 43.48 |
| Benchmarks Covered | 30 | 11 |
| Pricing (input/output) | $0.00 / $0.00 | $0.20 / $1.15 |

## Category Breakdown

### Agentic

- Winner: Directional only
- Hy4 preview public-lane score: 54.5 (Estimated · #37/123)
- Step 3.7 Flash public-lane score: 36.1 (Estimated · #73/123)

| Benchmark | Hy4 preview | Step 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 85.4% | 59.5% | Hy4 preview |
| CyberGym | 78.4% | Coming soon | Coming soon |
| WideResearch | 83.9% | Coming soon | Coming soon |
| DRACO | 77.2% | Coming soon | Coming soon |
| MCP Atlas | 83.7% | Coming soon | Coming soon |
| Toolathlon-Verified | 74.1% | Coming soon | Coming soon |
| APEX-Agents | 37.1% | Coming soon | Coming soon |
| skillsBench | 62.9% | Coming soon | Coming soon |
| JobBench | 61.7% | Coming soon | Coming soon |
| Agents' Last Exam | 22.8% | Coming soon | Coming soon |
| AutomationBench | 32.1% | Coming soon | Coming soon |
| BankerToolBench | 78.6% | Coming soon | Coming soon |
| HLE w/ tools | 55.4% | 47.2% | Hy4 preview |
| Terminal-Bench 2.1 (Vals) | 55.1% | Coming soon | Coming soon |
| CWE-bench v1 | 53.0% | Coming soon | Coming soon |
| BrowseComp | Coming soon | 75.8% | Coming soon |
| DeepSearchQA | Coming soon | 92.8% | Coming soon |
| Toolathlon | Coming soon | 49.5% | Coming soon |
| Claw-Eval | Coming soon | 67.1% | Coming soon |
| Gert Labs | Coming soon | 51.57% | Coming soon |

### Coding

- Winner: Directional only
- Hy4 preview public-lane score: 57.1 (Supported · #26/148)
- Step 3.7 Flash public-lane score: 30.6 (Estimated · #94/148)

| Benchmark | Hy4 preview | Step 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 85.4% | 59.5% | Hy4 preview |
| SWE-bench Pro | 65.7% | 56.3% | Hy4 preview |
| SWE Multilingual | 82.9% | Coming soon | Coming soon |
| DeepSWE | 64.3% | Coming soon | Coming soon |
| NL2Repo | 58.9% | Coming soon | Coming soon |
| ProgramBench | 17.5% | Coming soon | Coming soon |
| PostTrain Bench | 35.6% | Coming soon | Coming soon |
| sweMarathon | 31.9% | Coming soon | Coming soon |

### Reasoning

- Winner: Not comparable
- Hy4 preview public-lane score: Coming soon
- Step 3.7 Flash public-lane score: 76.5 (Unranked · 2 rankable rows)

| Benchmark | Hy4 preview | Step 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| CritPt | 16.9% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Hy4 preview public-lane score: 88.3 (Unranked · 1 rankable row)
- Step 3.7 Flash public-lane score: 75.4 (Unranked · 3 rankable rows)

| Benchmark | Hy4 preview | Step 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| OfficeQA Pro | 66.2% | Coming soon | Coming soon |
| SimpleVQA | Coming soon | 79.2% | Coming soon |
| V* | Coming soon | 95.3% | Coming soon |

### Knowledge

- Winner: Directional only
- Hy4 preview public-lane score: 63.6 (Estimated · #39/180)
- Step 3.7 Flash public-lane score: 44.8 (Estimated · #95/180)

| Benchmark | Hy4 preview | Step 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 92.3% | Coming soon | Coming soon |
| GPQA-D | 92.3% | Coming soon | Coming soon |
| HLE | 55.4% | Coming soon | Coming soon |
| HLE w/o tools | 43.4% | Coming soon | Coming soon |

### Instruction Following

- Winner: Not comparable
- Hy4 preview public-lane score: Coming soon
- Step 3.7 Flash public-lane score: 82.1 (#53/127)

### Mathematics

- Winner: Not comparable
- Hy4 preview public-lane score: Coming soon
- Step 3.7 Flash public-lane score: Coming soon

| Benchmark | Hy4 preview | Step 3.7 Flash | Winner |
|-----------|-----------|-----------|--------|
| Apex | 74.2% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Hy4 preview or Step 3.7 Flash?

Hy4 preview has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between Hy4 preview and Step 3.7 Flash?

The widest category gap is in coding, where the averages are 57.1 for Hy4 preview and 30.6 for Step 3.7 Flash.

### How many benchmarks does Hy4 preview cover on BenchLM?

Hy4 preview currently has 30 sourced benchmark scores on BenchLM.

### How many benchmarks does Step 3.7 Flash cover on BenchLM?

Step 3.7 Flash currently has 11 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Hy4 preview vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-hy4-preview)
- [Step 3.7 Flash vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-step-3-7-flash)
- [Hy4 preview vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-hy4-preview)
- [Step 3.7 Flash vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-step-3-7-flash)

## Explore More

- [Hy4 preview profile](/models/hy4-preview)
- [Step 3.7 Flash profile](/models/step-3-7-flash)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)