# A.X K2 vs Ornith-1.5-397B

> Side-by-side benchmark comparison for A.X K2 and Ornith-1.5-397B across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/a-x-k2-vs-ornith-1-5-397b
- Last updated: September 10, 2026

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

## Quick Verdict

Pick Ornith-1.5-397B if you want the stronger benchmark profile. A.X K2 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Ornith-1.5-397B leads overall 65.4 to 49.
- The biggest single benchmark swing is Terminal-Bench 2.1 in Agentic, with scores of 36.0% and 86.1%.

## Model Snapshot

| Property | A.X K2 | Ornith-1.5-397B |
|----------|----------|----------|
| Creator | SK Telecom | Ornith AI |
| Type | Open Weight | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 262K | 262K |
| Overall Score | null | 65.4 |
| Benchmarks Covered | 10 | 18 |
| 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
- Ornith-1.5-397B public-lane score: 60.8 (Estimated · #18/152)

| Benchmark | A.X K2 | Ornith-1.5-397B | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 36.0% | 86.1% | Ornith-1.5-397B |
| HLE w/ tools | Coming soon | 56.1% | Coming soon |
| MCP Atlas | Coming soon | 80% | Coming soon |
| Toolathlon-Verified | Coming soon | 71.2% | Coming soon |
| WideResearch | Coming soon | 80.8% | Coming soon |
| BrowseComp | Coming soon | 86.6% | Coming soon |
| Claw-Eval | Coming soon | 81.4% | Coming soon |

### Coding

- Winner: Coming soon
- A.X K2 public-lane score: Coming soon
- Ornith-1.5-397B public-lane score: 58.8 (Estimated · #26/151)

| Benchmark | A.X K2 | Ornith-1.5-397B | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench v6 | 84.0% | Coming soon | Coming soon |
| SciCode | 41% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 36.0% | 86.1% | Ornith-1.5-397B |
| SWE-bench Verified | Coming soon | 86% | Coming soon |
| SWE-bench Pro | Coming soon | 65.1% | Coming soon |
| SWE Multilingual | Coming soon | 79.6% | Coming soon |
| DeepSWE | Coming soon | 56.0% | Coming soon |
| frontierBench | Coming soon | 13.5% | Coming soon |
| NL2Repo | Coming soon | 59.5% | Coming soon |

### Knowledge

- Winner: Coming soon
- A.X K2 public-lane score: Coming soon
- Ornith-1.5-397B public-lane score: 60.4 (Estimated · #36/183)

| Benchmark | A.X K2 | Ornith-1.5-397B | Winner |
|-----------|-----------|-----------|--------|
| HLE | 27.8% | 44.6% | Ornith-1.5-397B |
| GPQA-D | 85.6% | 92.8% | Ornith-1.5-397B |
| GPQA | Coming soon | 92.8% | Coming soon |
| HLE w/o tools | Coming soon | 44.6% | Coming soon |

### Instruction Following

- Winner: Coming soon
- A.X K2 public-lane score: Coming soon
- Ornith-1.5-397B public-lane score: Coming soon

| Benchmark | A.X K2 | Ornith-1.5-397B | Winner |
|-----------|-----------|-----------|--------|
| IFBench | 75.9% | Coming soon | Coming soon |

### Mathematics

- Winner: Coming soon
- A.X K2 public-lane score: Coming soon
- Ornith-1.5-397B public-lane score: Coming soon

| Benchmark | A.X K2 | Ornith-1.5-397B | Winner |
|-----------|-----------|-----------|--------|
| AIME26 | 97.1% | Coming soon | Coming soon |
| Apex | 45.8% | Coming soon | Coming soon |
| Apex Shortlist | 88.6% | Coming soon | Coming soon |

## FAQ

### Which is better overall, A.X K2 or Ornith-1.5-397B?

Ornith-1.5-397B 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 Ornith-1.5-397B cover on BenchLM?

Ornith-1.5-397B currently has 18 sourced benchmark scores on BenchLM.

## Related Comparisons

- [A.X K2 vs A.X series](/compare/a-x-k2-vs-skt-ax)
- [Ornith-1.5-397B vs A.X series](/compare/ornith-1-5-397b-vs-skt-ax)
- [A.X K2 vs Ornith-1.5-35B-A3B](/compare/a-x-k2-vs-ornith-1-5-35b-a3b)
- [Ornith-1.5-397B vs Ornith-1.5-35B-A3B](/compare/ornith-1-5-35b-a3b-vs-ornith-1-5-397b)

## Explore More

- [A.X K2 profile](/models/a-x-k2)
- [Ornith-1.5-397B profile](/models/ornith-1-5-397b)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)