# Ornith-1.5-397B vs Step 5 Preview

> Side-by-side benchmark comparison for Ornith-1.5-397B and Step 5 Preview across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/ornith-1-5-397b-vs-step-5-preview
- Last updated: September 21, 2026

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

## Quick Verdict

Pick Step 5 Preview if you want the stronger benchmark profile. Ornith-1.5-397B only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Step 5 Preview leads overall 72 to 64.89.
- The biggest single benchmark swing is DeepSWE in Coding, with scores of 56.0% and 67.7%.
- Ornith-1.5-397B 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 | Ornith-1.5-397B | Step 5 Preview |
|----------|----------|----------|
| Creator | Ornith AI | StepFun |
| Type | Open Weight | Pending |
| Reasoning | Reasoning | Reasoning |
| Context | 262K | 1M |
| Overall Score | 64.89 | null |
| Benchmarks Covered | 18 | 22 |
| Pricing (input/output) | $0.00 / $0.00 | $1.00 / $2.70 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- Ornith-1.5-397B public-lane score: 60.6 (Estimated · #18/154)
- Step 5 Preview public-lane score: Coming soon

| Benchmark | Ornith-1.5-397B | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 86.1% | 85.0% | Ornith-1.5-397B |
| HLE w/ tools | 56.1% | Coming soon | Coming soon |
| MCP Atlas | 80% | 85.6% | Step 5 Preview |
| Toolathlon-Verified | 71.2% | 74.1% | Step 5 Preview |
| WideResearch | 80.8% | Coming soon | Coming soon |
| BrowseComp | 86.6% | 88.7% | Step 5 Preview |
| Claw-Eval | 81.4% | Coming soon | 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 |
| 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: Coming soon
- Ornith-1.5-397B public-lane score: 58.8 (Estimated · #27/156)
- Step 5 Preview public-lane score: Coming soon

| Benchmark | Ornith-1.5-397B | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 86.1% | 85.0% | Ornith-1.5-397B |
| SWE-bench Verified | 86% | Coming soon | Coming soon |
| SWE-bench Pro | 65.1% | Coming soon | Coming soon |
| SWE Multilingual | 79.6% | Coming soon | Coming soon |
| DeepSWE | 56.0% | 67.7% | Step 5 Preview |
| frontierBench | 13.5% | Coming soon | Coming soon |
| NL2Repo | 59.5% | Coming soon | 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: Coming soon
- Ornith-1.5-397B public-lane score: Coming soon
- Step 5 Preview public-lane score: 78.5 (Unranked · 2 rankable rows)

| Benchmark | Ornith-1.5-397B | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| CritPt | Coming soon | 20.9% | Coming soon |

### Multimodal & Grounded

- Winner: Coming soon
- Ornith-1.5-397B public-lane score: Coming soon
- Step 5 Preview public-lane score: 61.2 (#28/49)

| Benchmark | Ornith-1.5-397B | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| OfficeQA Pro | Coming soon | 60.3% | Coming soon |
| MMMU-Pro | Coming soon | 76% | Coming soon |

### Knowledge

- Winner: Coming soon
- Ornith-1.5-397B public-lane score: 60.3 (Estimated · #37/186)
- Step 5 Preview public-lane score: Coming soon

| Benchmark | Ornith-1.5-397B | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 92.8% | Coming soon | Coming soon |
| GPQA-D | 92.8% | 93.5% | Step 5 Preview |
| HLE | 44.6% | 46.5% | Step 5 Preview |
| HLE w/o tools | 44.6% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Ornith-1.5-397B or Step 5 Preview?

Step 5 Preview is ahead overall on BenchLM right now.

### How many benchmarks does Ornith-1.5-397B cover on BenchLM?

Ornith-1.5-397B currently has 18 sourced benchmark scores on BenchLM.

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

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

## Related Comparisons

- [Ornith-1.5-397B vs Ornith-1.5-35B-A3B](/compare/ornith-1-5-35b-a3b-vs-ornith-1-5-397b)
- [Step 5 Preview vs Ornith-1.5-35B-A3B](/compare/ornith-1-5-35b-a3b-vs-step-5-preview)
- [Ornith-1.5-397B vs Ornith-1.5-9B](/compare/ornith-1-5-397b-vs-ornith-1-5-9b)
- [Step 5 Preview vs Ornith-1.5-9B](/compare/ornith-1-5-9b-vs-step-5-preview)

## Explore More

- [Ornith-1.5-397B profile](/models/ornith-1-5-397b)
- [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)