# A.X K2 vs Solar Pro 4

> Side-by-side benchmark comparison for A.X K2 and Solar Pro 4 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/a-x-k2-vs-solar-pro-4
- 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 Pro 4 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 Terminal-Bench 2.1 in Agentic, with scores of 36.0% and 57.0%.
- A.X K2 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Solar Pro 4 also has the larger context window at 512K.

## Model Snapshot

| Property | A.X K2 | Solar Pro 4 |
|----------|----------|----------|
| Creator | SK Telecom | Upstage |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 262K | 512K |
| Overall Score | null | null |
| Benchmarks Covered | 10 | 10 |
| Pricing (input/output) | $0.00 / $0.00 | $0.30 / $1.20 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- A.X K2 public-lane score: Coming soon
- Solar Pro 4 public-lane score: Coming soon

| Benchmark | A.X K2 | Solar Pro 4 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 36.0% | 57.0% | Solar Pro 4 |
| BrowseComp | Coming soon | 49.2% | Coming soon |
| MCP Atlas | Coming soon | 61.4% | Coming soon |
| APEX-Agents | Coming soon | 18.7% | Coming soon |

### Coding

- Winner: Coming soon
- A.X K2 public-lane score: Coming soon
- Solar Pro 4 public-lane score: Coming soon

| Benchmark | A.X K2 | Solar Pro 4 | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench v6 | 84.0% | Coming soon | Coming soon |
| SciCode | 41% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 36.0% | 57.0% | Solar Pro 4 |
| SWE-bench Verified | Coming soon | 70.6% | Coming soon |
| LiveCodeBench | Coming soon | 87.8% | Coming soon |

### Knowledge

- Winner: Coming soon
- A.X K2 public-lane score: Coming soon
- Solar Pro 4 public-lane score: Coming soon

| Benchmark | A.X K2 | Solar Pro 4 | Winner |
|-----------|-----------|-----------|--------|
| HLE | 27.8% | Coming soon | Coming soon |
| GPQA-D | 85.6% | 89.0% | Solar Pro 4 |
| MMLU-Pro | Coming soon | 86.3% | Coming soon |

### Instruction Following

- Winner: Coming soon
- A.X K2 public-lane score: Coming soon
- Solar Pro 4 public-lane score: Coming soon

| Benchmark | A.X K2 | Solar Pro 4 | Winner |
|-----------|-----------|-----------|--------|
| IFBench | 75.9% | Coming soon | Coming soon |

### Mathematics

- Winner: Coming soon
- A.X K2 public-lane score: Coming soon
- Solar Pro 4 public-lane score: Coming soon

| Benchmark | A.X K2 | Solar Pro 4 | Winner |
|-----------|-----------|-----------|--------|
| AIME26 | 97.1% | 95.3% | A.X K2 |
| Apex | 45.8% | Coming soon | Coming soon |
| Apex Shortlist | 88.6% | Coming soon | Coming soon |

## FAQ

### Which is better overall, A.X K2 or Solar Pro 4?

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 Pro 4 cover on BenchLM?

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

## Related Comparisons

- [A.X K2 vs A.X series](/compare/a-x-k2-vs-skt-ax)
- [Solar Pro 4 vs A.X series](/compare/skt-ax-vs-solar-pro-4)
- [A.X K2 vs Solar Pro 2](/compare/a-x-k2-vs-solar-pro-2)
- [Solar Pro 4 vs Solar Pro 2](/compare/solar-pro-2-vs-solar-pro-4)

## Explore More

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