# A.X K2 vs Solar Open 2

> Side-by-side benchmark comparison for A.X K2 and Solar Open 2 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/a-x-k2-vs-solar-open-2
- Last updated: September 10, 2026

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

## Quick Verdict

Pick A.X K2 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

- A.X K2 leads overall 49 to 0.
- The biggest single benchmark swing is LiveCodeBench v6 in Coding, with scores of 84.0% and 92.4%.
- Solar Open 2 also has the larger context window at 1M.

## Model Snapshot

| Property | A.X K2 | Solar Open 2 |
|----------|----------|----------|
| Creator | SK Telecom | Upstage |
| Type | Open Weight | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 262K | 1M |
| Overall Score | null | null |
| Benchmarks Covered | 10 | 11 |
| Pricing (input/output) | $0.00 / $0.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- A.X K2 public-lane score: Coming soon
- Solar Open 2 public-lane score: Coming soon

| Benchmark | A.X K2 | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 36.0% | Coming soon | Coming soon |
| terminalBenchHard | Coming soon | 28.3% | Coming soon |
| APEX-Agents | Coming soon | 16.6% | Coming soon |
| MCP Atlas | Coming soon | 58.2% | Coming soon |

### Coding

- Winner: Coming soon
- A.X K2 public-lane score: Coming soon
- Solar Open 2 public-lane score: Coming soon

| Benchmark | A.X K2 | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench v6 | 84.0% | 92.4% | Solar Open 2 |
| SciCode | 41% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 36.0% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 70.4% | Coming soon |

### Knowledge

- Winner: Coming soon
- A.X K2 public-lane score: Coming soon
- Solar Open 2 public-lane score: Coming soon

| Benchmark | A.X K2 | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| HLE | 27.8% | Coming soon | Coming soon |
| GPQA-D | 85.6% | 86.3% | Solar Open 2 |
| MMLU-Pro | Coming soon | 86.2% | Coming soon |
| HLE w/o tools | Coming soon | 28.8% | Coming soon |

### Instruction Following

- Winner: Coming soon
- A.X K2 public-lane score: Coming soon
- Solar Open 2 public-lane score: Coming soon

| Benchmark | A.X K2 | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| IFBench | 75.9% | 80% | Solar Open 2 |

### Mathematics

- Winner: Coming soon
- A.X K2 public-lane score: Coming soon
- Solar Open 2 public-lane score: Coming soon

| Benchmark | A.X K2 | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| AIME26 | 97.1% | 95.7% | A.X K2 |
| Apex | 45.8% | Coming soon | Coming soon |
| Apex Shortlist | 88.6% | Coming soon | Coming soon |
| HMMT Feb 2026 | Coming soon | 93.9% | Coming soon |

## FAQ

### Which is better overall, A.X K2 or Solar Open 2?

A.X K2 is ahead overall on BenchLM right now.

### How many benchmarks does A.X K2 cover on BenchLM?

A.X K2 currently has 10 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

- [A.X K2 vs A.X series](/compare/a-x-k2-vs-skt-ax)
- [Solar Open 2 vs A.X series](/compare/skt-ax-vs-solar-open-2)
- [A.X K2 vs Claude Fable 5.1](/compare/a-x-k2-vs-claude-fable-5-1)
- [Solar Open 2 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-solar-open-2)

## Explore More

- [A.X K2 profile](/models/a-x-k2)
- [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)