# Hy4 preview vs Solar Open 2

> Side-by-side benchmark comparison for Hy4 preview and Solar Open 2 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/hy4-preview-vs-solar-open-2
- Last updated: September 10, 2026

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

## Quick Verdict

Pick Hy4 preview 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

- Hy4 preview leads overall 61.08 to 0.
- The biggest single benchmark swing is MCP Atlas in Agentic, with scores of 83.7% and 58.2%.

## Model Snapshot

| Property | Hy4 preview | Solar Open 2 |
|----------|----------|----------|
| Creator | Tencent | Upstage |
| Type | Open Weight | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 61.08 | null |
| Benchmarks Covered | 28 | 11 |
| Pricing (input/output) | $0.00 / $0.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- Hy4 preview public-lane score: 58.2 (Estimated · #30/152)
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Hy4 preview | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 85.4% | Coming soon | Coming soon |
| CyberGym | 78.4% | Coming soon | Coming soon |
| WideResearch | 83.9% | Coming soon | Coming soon |
| DRACO | 77.2% | Coming soon | Coming soon |
| MCP Atlas | 83.7% | 58.2% | Hy4 preview |
| Toolathlon-Verified | 74.1% | Coming soon | Coming soon |
| APEX-Agents | 37.1% | 16.6% | Hy4 preview |
| skillsBench | 62.9% | Coming soon | Coming soon |
| JobBench | 61.7% | Coming soon | Coming soon |
| Agents' Last Exam | 22.8% | Coming soon | Coming soon |
| AutomationBench | 32.1% | Coming soon | Coming soon |
| BankerToolBench | 78.6% | Coming soon | Coming soon |
| HLE w/ tools | 55.4% | Coming soon | Coming soon |
| terminalBenchHard | Coming soon | 28.3% | Coming soon |

### Coding

- Winner: Coming soon
- Hy4 preview public-lane score: 59.2 (Estimated · #24/151)
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Hy4 preview | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 85.4% | Coming soon | Coming soon |
| SWE-bench Pro | 65.7% | Coming soon | Coming soon |
| SWE Multilingual | 82.9% | Coming soon | Coming soon |
| DeepSWE | 64.3% | Coming soon | Coming soon |
| NL2Repo | 58.9% | Coming soon | Coming soon |
| ProgramBench | 17.5% | Coming soon | Coming soon |
| PostTrain Bench | 35.6% | Coming soon | Coming soon |
| sweMarathon | 31.9% | Coming soon | Coming soon |
| LiveCodeBench v6 | Coming soon | 92.4% | Coming soon |
| SWE-bench Verified | Coming soon | 70.4% | Coming soon |

### Multimodal & Grounded

- Winner: Coming soon
- Hy4 preview public-lane score: 84.8 (Unranked · 1 rankable row)
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Hy4 preview | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| OfficeQA Pro | 66.2% | Coming soon | Coming soon |

### Reasoning

- Winner: Coming soon
- Hy4 preview public-lane score: Coming soon
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Hy4 preview | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| CritPt | 16.9% | Coming soon | Coming soon |

### Knowledge

- Winner: Coming soon
- Hy4 preview public-lane score: 56.5 (Estimated · #47/183)
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Hy4 preview | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 92.3% | Coming soon | Coming soon |
| GPQA-D | 92.3% | 86.3% | Hy4 preview |
| HLE | 55.4% | Coming soon | Coming soon |
| HLE w/o tools | 43.4% | 28.8% | Hy4 preview |
| MMLU-Pro | Coming soon | 86.2% | Coming soon |

### Instruction Following

- Winner: Coming soon
- Hy4 preview public-lane score: Coming soon
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Hy4 preview | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| IFBench | Coming soon | 80% | Coming soon |

### Mathematics

- Winner: Coming soon
- Hy4 preview public-lane score: Coming soon
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Hy4 preview | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| Apex | 74.2% | Coming soon | Coming soon |
| HMMT Feb 2026 | Coming soon | 93.9% | Coming soon |
| AIME26 | Coming soon | 95.7% | Coming soon |

## FAQ

### Which is better overall, Hy4 preview or Solar Open 2?

Hy4 preview is ahead overall on BenchLM right now.

### How many benchmarks does Hy4 preview cover on BenchLM?

Hy4 preview currently has 28 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

- [Hy4 preview vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-hy4-preview)
- [Solar Open 2 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-solar-open-2)
- [Hy4 preview vs GPT-6 Astra](/compare/gpt-6-astra-vs-hy4-preview)
- [Solar Open 2 vs GPT-6 Astra](/compare/gpt-6-astra-vs-solar-open-2)

## Explore More

- [Hy4 preview profile](/models/hy4-preview)
- [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)