# Solar Open 2 vs Solar Pro 4

> Side-by-side benchmark comparison for Solar Open 2 and Solar Pro 4 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/solar-open-2-vs-solar-pro-4
- Last updated: September 10, 2026

- Shared sourced benchmarks: 6
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Treat this as a split decision: use the category and benchmark breakdown to decide which profile better matches your workload.

## Summary

- Solar Open 2 and Solar Pro 4 are tied on overall score, so the decision depends on category fit rather than the headline number.
- The biggest single benchmark swing is MCP Atlas in Agentic, with scores of 58.2% and 61.4%.
- Solar Open 2 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Solar Open 2 also has the larger context window at 1M.

## Model Snapshot

| Property | Solar Open 2 | Solar Pro 4 |
|----------|----------|----------|
| Creator | Upstage | Upstage |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 512K |
| Overall Score | null | null |
| Benchmarks Covered | 11 | 10 |
| Pricing (input/output) | $0.00 / $0.00 | $0.30 / $1.20 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- Solar Open 2 public-lane score: Coming soon
- Solar Pro 4 public-lane score: Coming soon

| Benchmark | Solar Open 2 | Solar Pro 4 | Winner |
|-----------|-----------|-----------|--------|
| terminalBenchHard | 28.3% | Coming soon | Coming soon |
| APEX-Agents | 16.6% | 18.7% | Solar Pro 4 |
| MCP Atlas | 58.2% | 61.4% | Solar Pro 4 |
| Terminal-Bench 2.1 | Coming soon | 57.0% | Coming soon |
| BrowseComp | Coming soon | 49.2% | Coming soon |

### Coding

- Winner: Coming soon
- Solar Open 2 public-lane score: Coming soon
- Solar Pro 4 public-lane score: Coming soon

| Benchmark | Solar Open 2 | Solar Pro 4 | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench v6 | 92.4% | Coming soon | Coming soon |
| SWE-bench Verified | 70.4% | 70.6% | Solar Pro 4 |
| Terminal-Bench 2.1 | Coming soon | 57.0% | Coming soon |
| LiveCodeBench | Coming soon | 87.8% | Coming soon |

### Knowledge

- Winner: Coming soon
- Solar Open 2 public-lane score: Coming soon
- Solar Pro 4 public-lane score: Coming soon

| Benchmark | Solar Open 2 | Solar Pro 4 | Winner |
|-----------|-----------|-----------|--------|
| MMLU-Pro | 86.2% | 86.3% | Solar Pro 4 |
| GPQA-D | 86.3% | 89.0% | Solar Pro 4 |
| HLE w/o tools | 28.8% | Coming soon | Coming soon |

### Instruction Following

- Winner: Coming soon
- Solar Open 2 public-lane score: Coming soon
- Solar Pro 4 public-lane score: Coming soon

| Benchmark | Solar Open 2 | Solar Pro 4 | Winner |
|-----------|-----------|-----------|--------|
| IFBench | 80% | Coming soon | Coming soon |

### Mathematics

- Winner: Coming soon
- Solar Open 2 public-lane score: Coming soon
- Solar Pro 4 public-lane score: Coming soon

| Benchmark | Solar Open 2 | Solar Pro 4 | Winner |
|-----------|-----------|-----------|--------|
| HMMT Feb 2026 | 93.9% | Coming soon | Coming soon |
| AIME26 | 95.7% | 95.3% | Solar Open 2 |

## FAQ

### Which is better overall, Solar Open 2 or Solar Pro 4?

Solar Open 2 and Solar Pro 4 are tied on overall score in the current BenchLM data.

### How many benchmarks does Solar Open 2 cover on BenchLM?

Solar Open 2 currently has 11 sourced benchmark scores on BenchLM.

### How many benchmarks does Solar Pro 4 cover on BenchLM?

Solar Pro 4 currently has 10 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Solar Open 2 vs Solar Pro 2](/compare/solar-open-2-vs-solar-pro-2)
- [Solar Pro 4 vs Solar Pro 2](/compare/solar-pro-2-vs-solar-pro-4)
- [Solar Open 2 vs Solar Pro 3](/compare/solar-open-2-vs-solar-pro-3)
- [Solar Pro 4 vs Solar Pro 3](/compare/solar-pro-3-vs-solar-pro-4)

## Explore More

- [Solar Open 2 profile](/models/solar-open-2)
- [Solar Pro 4 profile](/models/solar-pro-4)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)