# Ornith-1.5-397B vs Solar Open 2

> Side-by-side benchmark comparison for Ornith-1.5-397B and Solar Open 2 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/ornith-1-5-397b-vs-solar-open-2
- Last updated: September 10, 2026

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

## Quick Verdict

Pick Ornith-1.5-397B if you want the stronger benchmark profile. Solar Open 2 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Ornith-1.5-397B leads overall 65.4 to 0.
- The biggest single benchmark swing is MCP Atlas in Agentic, with scores of 80% and 58.2%.
- Solar Open 2 also has the larger context window at 1M.

## Model Snapshot

| Property | Ornith-1.5-397B | Solar Open 2 |
|----------|----------|----------|
| Creator | Ornith AI | Upstage |
| Type | Open Weight | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 262K | 1M |
| Overall Score | 65.4 | null |
| Benchmarks Covered | 18 | 11 |
| Pricing (input/output) | $0.00 / $0.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- Ornith-1.5-397B public-lane score: 60.8 (Estimated · #18/152)
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Ornith-1.5-397B | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 86.1% | Coming soon | Coming soon |
| HLE w/ tools | 56.1% | Coming soon | Coming soon |
| MCP Atlas | 80% | 58.2% | Ornith-1.5-397B |
| Toolathlon-Verified | 71.2% | Coming soon | Coming soon |
| WideResearch | 80.8% | Coming soon | Coming soon |
| BrowseComp | 86.6% | Coming soon | Coming soon |
| Claw-Eval | 81.4% | Coming soon | Coming soon |
| terminalBenchHard | Coming soon | 28.3% | Coming soon |
| APEX-Agents | Coming soon | 16.6% | Coming soon |

### Coding

- Winner: Coming soon
- Ornith-1.5-397B public-lane score: 58.8 (Estimated · #26/151)
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Ornith-1.5-397B | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 86.1% | Coming soon | Coming soon |
| SWE-bench Verified | 86% | 70.4% | Ornith-1.5-397B |
| SWE-bench Pro | 65.1% | Coming soon | Coming soon |
| SWE Multilingual | 79.6% | Coming soon | Coming soon |
| DeepSWE | 56.0% | Coming soon | Coming soon |
| frontierBench | 13.5% | Coming soon | Coming soon |
| NL2Repo | 59.5% | Coming soon | Coming soon |
| LiveCodeBench v6 | Coming soon | 92.4% | Coming soon |

### Knowledge

- Winner: Coming soon
- Ornith-1.5-397B public-lane score: 60.4 (Estimated · #36/183)
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Ornith-1.5-397B | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 92.8% | Coming soon | Coming soon |
| GPQA-D | 92.8% | 86.3% | Ornith-1.5-397B |
| HLE | 44.6% | Coming soon | Coming soon |
| HLE w/o tools | 44.6% | 28.8% | Ornith-1.5-397B |
| MMLU-Pro | Coming soon | 86.2% | Coming soon |

### Instruction Following

- Winner: Coming soon
- Ornith-1.5-397B public-lane score: Coming soon
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Ornith-1.5-397B | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| IFBench | Coming soon | 80% | Coming soon |

### Mathematics

- Winner: Coming soon
- Ornith-1.5-397B public-lane score: Coming soon
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Ornith-1.5-397B | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| HMMT Feb 2026 | Coming soon | 93.9% | Coming soon |
| AIME26 | Coming soon | 95.7% | Coming soon |

## FAQ

### Which is better overall, Ornith-1.5-397B or Solar Open 2?

Ornith-1.5-397B 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 Solar Open 2 cover on BenchLM?

Solar Open 2 currently has 11 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)
- [Solar Open 2 vs Ornith-1.5-35B-A3B](/compare/ornith-1-5-35b-a3b-vs-solar-open-2)
- [Ornith-1.5-397B vs Ornith-1.5-9B](/compare/ornith-1-5-397b-vs-ornith-1-5-9b)
- [Solar Open 2 vs Ornith-1.5-9B](/compare/ornith-1-5-9b-vs-solar-open-2)

## Explore More

- [Ornith-1.5-397B profile](/models/ornith-1-5-397b)
- [Solar Open 2 profile](/models/solar-open-2)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)