# LongCat-2.5 vs Solar Open 2

> Side-by-side benchmark comparison for LongCat-2.5 and Solar Open 2 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/longcat-2-5-vs-solar-open-2
- Last updated: November 9, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: LongCat-2.5 and Solar Open 2 share only 1 sourced benchmark row.

## Summary

- Only 1 shared sourced benchmark row is available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Solar Open 2 has the lower published output-token price.

## Model Snapshot

| Property | LongCat-2.5 | Solar Open 2 |
|----------|----------|----------|
| Creator | Meituan | Upstage |
| Type | Open Weight | Open Weight |
| Reasoning | Hybrid | Reasoning |
| Context | 1M | 1M |
| Independent public score (not head-to-head) | null | null |
| Benchmarks Covered | 22 | 11 |
| Pricing (input/output) | $0.30 / $1.20 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- LongCat-2.5 public-lane score: Coming soon
- Solar Open 2 public-lane score: Coming soon

| Benchmark | LongCat-2.5 | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 88.4% | Coming soon | Coming soon |
| Terminal-Bench 4.0 | 38.50% | Coming soon | Coming soon |
| BrowseComp | 91.9% | Coming soon | Coming soon |
| AutomationBench | 51.8% | Coming soon | Coming soon |
| HLE w/ tools | 63.1% | Coming soon | Coming soon |
| Agents' Last Exam | 38.5% | Coming soon | Coming soon |
| MCP Atlas | 83.1% | 58.2% | LongCat-2.5 |
| JobBench | 65.4% | Coming soon | Coming soon |
| skillsBench | 63.3% | Coming soon | Coming soon |
| SpreadsheetBench 2 | 34.9% | Coming soon | Coming soon |
| Claw-Eval | 78.3% | Coming soon | Coming soon |
| terminalBenchHard | Coming soon | 28.3% | Coming soon |
| APEX-Agents | Coming soon | 16.6% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- LongCat-2.5 public-lane score: Coming soon
- Solar Open 2 public-lane score: Coming soon

| Benchmark | LongCat-2.5 | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 88.4% | Coming soon | Coming soon |
| ProgramBench | 25.5% | Coming soon | Coming soon |
| DeepSWE | 64.6% | Coming soon | Coming soon |
| PaperBench | 82.1% | Coming soon | Coming soon |
| SWE-Atlas Codebase QnA | 58.3% | Coming soon | Coming soon |
| NL2Repo | 60.5% | Coming soon | Coming soon |
| LiveCodeBench v6 | Coming soon | 92.4% | Coming soon |
| SWE-bench Verified | Coming soon | 70.4% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- LongCat-2.5 public-lane score: Coming soon
- Solar Open 2 public-lane score: Coming soon

| Benchmark | LongCat-2.5 | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| Vision2Web | 78.6% | Coming soon | Coming soon |
| CharXiv | 90.2% | Coming soon | Coming soon |
| MathVision w/ Python | 96.5% | Coming soon | Coming soon |
| Video-MME | 85.2% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- LongCat-2.5 public-lane score: Coming soon
- Solar Open 2 public-lane score: Coming soon

| Benchmark | LongCat-2.5 | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| FrontierScience | 77% | Coming soon | Coming soon |
| MMLU-Pro | Coming soon | 86.2% | Coming soon |
| GPQA-D | Coming soon | 86.3% | Coming soon |
| HLE w/o tools | Coming soon | 28.8% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- LongCat-2.5 public-lane score: Coming soon
- Solar Open 2 public-lane score: Coming soon

| Benchmark | LongCat-2.5 | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| IFBench | Coming soon | 80% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- LongCat-2.5 public-lane score: Coming soon
- Solar Open 2 public-lane score: Coming soon

| Benchmark | LongCat-2.5 | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| HMMT Feb 2026 | Coming soon | 93.9% | Coming soon |
| AIME26 | Coming soon | 95.7% | Coming soon |

## FAQ

### Is there enough evidence to pick between LongCat-2.5 and Solar Open 2?

Not yet. The models share only 1 sourced benchmark row, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [LongCat-2.5 vs Claude Fable 5.2](/compare/claude-fable-5-2-vs-longcat-2-5)
- [Solar Open 2 vs Claude Fable 5.2](/compare/claude-fable-5-2-vs-solar-open-2)
- [LongCat-2.5 vs Gemini 4 Carbon](/compare/gemini-4-carbon-vs-longcat-2-5)
- [Solar Open 2 vs Gemini 4 Carbon](/compare/gemini-4-carbon-vs-solar-open-2)

## Explore More

- [LongCat-2.5 profile](/models/longcat-2-5)
- [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)