# Step 3.7 Flash vs Step 5 Preview

> Side-by-side benchmark comparison for Step 3.7 Flash and Step 5 Preview across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/step-3-7-flash-vs-step-5-preview
- Last updated: September 21, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Evidence is too thin for a benchmark verdict: Step 3.7 Flash and Step 5 Preview share only 1 sourced benchmark row.

## Summary

- Only 1 shared sourced benchmark row is available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Step 3.7 Flash has the lower published output-token price.
- Step 5 Preview has the larger published context window at 1M.

## Model Snapshot

| Property | Step 3.7 Flash | Step 5 Preview |
|----------|----------|----------|
| Creator | StepFun | StepFun |
| Type | Open Weight | Pending |
| Reasoning | Reasoning | Reasoning |
| Context | 256K | 1M |
| Independent public score (not head-to-head) | 49.93 | null |
| Benchmarks Covered | 11 | 22 |
| Pricing (input/output) | $0.20 / $1.15 | $1.00 / $2.70 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Step 3.7 Flash public-lane score: 48.9 (Estimated · #66/154)
- Step 5 Preview public-lane score: Coming soon

| Benchmark | Step 3.7 Flash | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 59.5% | Coming soon | Coming soon |
| BrowseComp | 75.8% | 88.7% | Step 5 Preview |
| DeepSearchQA | 92.8% | Coming soon | Coming soon |
| Toolathlon | 49.5% | Coming soon | Coming soon |
| Claw-Eval | 67.1% | Coming soon | Coming soon |
| HLE w/ tools | 47.2% | Coming soon | Coming soon |
| Gert Labs | 51.57% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 85.0% | Coming soon |
| Terminal-Bench 4.0 | Coming soon | 33.30% | Coming soon |
| CyberGym | Coming soon | 84.7% | Coming soon |
| AutomationBench | Coming soon | 44.0% | Coming soon |
| Toolathlon-Verified | Coming soon | 74.1% | Coming soon |
| MCP Atlas | Coming soon | 85.6% | Coming soon |
| JobBench | Coming soon | 59.0% | Coming soon |
| APEX-Agents | Coming soon | 37.8% | Coming soon |
| DRACO | Coming soon | 83.3% | Coming soon |
| Agents' Last Exam | Coming soon | 29.5% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Step 3.7 Flash public-lane score: 47.6 (Estimated · #77/156)
- Step 5 Preview public-lane score: Coming soon

| Benchmark | Step 3.7 Flash | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Pro | 56.3% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 59.5% | Coming soon | Coming soon |
| DeepSWE | Coming soon | 67.7% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 85.0% | Coming soon |
| SciCode | Coming soon | 58.9% | Coming soon |
| ProgramBench | Coming soon | 80.5% | Coming soon |
| sweMarathon | Coming soon | 72.7% | Coming soon |
| MLS-Bench Lite | Coming soon | 40.5% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Step 3.7 Flash public-lane score: 71.7 (Unranked · 2 rankable rows)
- Step 5 Preview public-lane score: 78.5 (Unranked · 2 rankable rows)

| Benchmark | Step 3.7 Flash | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| CritPt | Coming soon | 20.9% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Step 3.7 Flash public-lane score: 71 (Unranked · 3 rankable rows)
- Step 5 Preview public-lane score: 61.2 (#28/49)

| Benchmark | Step 3.7 Flash | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| SimpleVQA | 79.2% | Coming soon | Coming soon |
| V* | 95.3% | Coming soon | Coming soon |
| OfficeQA Pro | Coming soon | 60.3% | Coming soon |
| MMMU-Pro | Coming soon | 76% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Step 3.7 Flash public-lane score: 48.8 (Estimated · #95/186)
- Step 5 Preview public-lane score: Coming soon

| Benchmark | Step 3.7 Flash | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| GPQA-D | Coming soon | 93.5% | Coming soon |
| HLE | Coming soon | 46.5% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Step 3.7 Flash public-lane score: 80.6 (#53/124)
- Step 5 Preview public-lane score: Coming soon

## FAQ

### Is there enough evidence to pick between Step 3.7 Flash and Step 5 Preview?

Not yet. The models share only 1 sourced benchmark row, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [Step 3.7 Flash vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-step-3-7-flash)
- [Step 5 Preview vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-step-5-preview)
- [Step 3.7 Flash vs GPT-6 Astra](/compare/gpt-6-astra-vs-step-3-7-flash)
- [Step 5 Preview vs GPT-6 Astra](/compare/gpt-6-astra-vs-step-5-preview)

## Explore More

- [Step 3.7 Flash profile](/models/step-3-7-flash)
- [Step 5 Preview profile](/models/step-5-preview)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)