# Step 5 Preview vs Ultramarine 1 Flash

> Side-by-side benchmark comparison for Step 5 Preview and Ultramarine 1 Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/step-5-preview-vs-ultramarine-1-flash
- Last updated: October 15, 2026

- Shared sourced benchmarks: 5
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Step 5 Preview leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- Step 5 Preview has the higher overall point estimate 69.39 to 0. Conditional score ranges do not establish rank confidence.
- The biggest single benchmark swing is AutomationBench in Agentic, with scores of 44.0% and 50.2%.
- Ultramarine 1 Flash is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Step 5 Preview also has the larger context window at 1M.

## Model Snapshot

| Property | Step 5 Preview | Ultramarine 1 Flash |
|----------|----------|----------|
| Creator | StepFun | Paper Instruments |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | Not disclosed |
| Overall Score | 69.39 | null |
| Benchmarks Covered | 22 | 5 |
| Pricing (input/output) | $1.00 / $2.70 | $0.15 / $0.50 |

## Category Breakdown

### Agentic

- Winner: Not comparable
- Step 5 Preview public-lane score: 65.3 (Estimated · #18/126)
- Ultramarine 1 Flash public-lane score: Coming soon

| Benchmark | Step 5 Preview | Ultramarine 1 Flash | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 85.0% | 83.2% | Step 5 Preview |
| Terminal-Bench 4.0 | 33.30% | Coming soon | Coming soon |
| CyberGym | 84.7% | Coming soon | Coming soon |
| AutomationBench | 44.0% | 50.2% | Ultramarine 1 Flash |
| Toolathlon-Verified | 74.1% | Coming soon | Coming soon |
| MCP Atlas | 85.6% | Coming soon | Coming soon |
| JobBench | 59.0% | 62.9% | Ultramarine 1 Flash |
| APEX-Agents | 37.8% | Coming soon | Coming soon |
| DRACO | 83.3% | Coming soon | Coming soon |
| BrowseComp | 88.7% | Coming soon | Coming soon |
| Agents' Last Exam | 29.5% | Coming soon | Coming soon |

### Coding

- Winner: Not comparable
- Step 5 Preview public-lane score: 60.4 (Estimated · #20/149)
- Ultramarine 1 Flash public-lane score: Coming soon

| Benchmark | Step 5 Preview | Ultramarine 1 Flash | Winner |
|-----------|-----------|-----------|--------|
| DeepSWE | 67.7% | 61.5% | Step 5 Preview |
| Terminal-Bench 2.1 | 85.0% | 83.2% | Step 5 Preview |
| SciCode | 58.9% | Coming soon | Coming soon |
| ProgramBench | 80.5% | Coming soon | Coming soon |
| sweMarathon | 72.7% | Coming soon | Coming soon |
| MLS-Bench Lite | 40.5% | Coming soon | Coming soon |

### Reasoning

- Winner: Not comparable
- Step 5 Preview public-lane score: 83.4 (Unranked · 2 rankable rows)
- Ultramarine 1 Flash public-lane score: Coming soon

| Benchmark | Step 5 Preview | Ultramarine 1 Flash | Winner |
|-----------|-----------|-----------|--------|
| CritPt | 20.9% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Step 5 Preview public-lane score: 74.6 (#24/54)
- Ultramarine 1 Flash public-lane score: Coming soon

| Benchmark | Step 5 Preview | Ultramarine 1 Flash | Winner |
|-----------|-----------|-----------|--------|
| OfficeQA Pro | 60.3% | Coming soon | Coming soon |
| MMMU-Pro | 76% | Coming soon | Coming soon |

### Knowledge

- Winner: Not comparable
- Step 5 Preview public-lane score: 68.5 (Supported · #22/182)
- Ultramarine 1 Flash public-lane score: Coming soon

| Benchmark | Step 5 Preview | Ultramarine 1 Flash | Winner |
|-----------|-----------|-----------|--------|
| GPQA-D | 93.5% | Coming soon | Coming soon |
| HLE | 46.5% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Step 5 Preview or Ultramarine 1 Flash?

Step 5 Preview has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### How many benchmarks does Step 5 Preview cover on BenchLM?

Step 5 Preview currently has 22 sourced benchmark scores on BenchLM.

### How many benchmarks does Ultramarine 1 Flash cover on BenchLM?

Ultramarine 1 Flash currently has 5 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Step 5 Preview vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-step-5-preview)
- [Ultramarine 1 Flash vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-ultramarine-1-flash)
- [Step 5 Preview vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-step-5-preview)
- [Ultramarine 1 Flash vs GPT-6.1 Sol](/compare/gpt-6-1-sol-vs-ultramarine-1-flash)

## Explore More

- [Step 5 Preview profile](/models/step-5-preview)
- [Ultramarine 1 Flash profile](/models/ultramarine-1-flash)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)