# A.X K2 vs GPT-5.4 Pro

> Side-by-side benchmark comparison for A.X K2 and GPT-5.4 Pro across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/a-x-k2-vs-gpt-5-4-pro
- Last updated: September 10, 2026

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: A.X K2 and GPT-5.4 Pro 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.
- A.X K2 has the lower published output-token price.
- GPT-5.4 Pro has the larger published context window at 1.05M.

## Model Snapshot

| Property | A.X K2 | GPT-5.4 Pro |
|----------|----------|----------|
| Creator | SK Telecom | OpenAI |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 262K | 1.05M |
| Independent public score (not head-to-head) | null | 60.01 |
| Benchmarks Covered | 10 | 10 |
| Pricing (input/output) | $0.00 / $0.00 | $30.00 / $180.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- A.X K2 public-lane score: Coming soon
- GPT-5.4 Pro public-lane score: 55.9 (Estimated · #35/152)

| Benchmark | A.X K2 | GPT-5.4 Pro | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 36.0% | Coming soon | Coming soon |
| BrowseComp | Coming soon | 89.3% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- A.X K2 public-lane score: Coming soon
- GPT-5.4 Pro public-lane score: Coming soon

| Benchmark | A.X K2 | GPT-5.4 Pro | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench v6 | 84.0% | Coming soon | Coming soon |
| SciCode | 41% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 36.0% | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- A.X K2 public-lane score: Coming soon
- GPT-5.4 Pro public-lane score: 70.1 (Unranked · 2 rankable rows)

| Benchmark | A.X K2 | GPT-5.4 Pro | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | Coming soon | 83.3% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- A.X K2 public-lane score: Coming soon
- GPT-5.4 Pro public-lane score: 58.5 (Estimated · #40/183)

| Benchmark | A.X K2 | GPT-5.4 Pro | Winner |
|-----------|-----------|-----------|--------|
| HLE | 27.8% | 58.7% | GPT-5.4 Pro |
| GPQA-D | 85.6% | Coming soon | Coming soon |
| FrontierScience | Coming soon | 36.7% | Coming soon |
| FrontierScience Research | Coming soon | 36.7% | Coming soon |
| HLE w/o tools | Coming soon | 42.7% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- A.X K2 public-lane score: Coming soon
- GPT-5.4 Pro public-lane score: Coming soon

| Benchmark | A.X K2 | GPT-5.4 Pro | Winner |
|-----------|-----------|-----------|--------|
| IFBench | 75.9% | Coming soon | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- A.X K2 public-lane score: Coming soon
- GPT-5.4 Pro public-lane score: 69 (Unranked · 4 rankable rows)

| Benchmark | A.X K2 | GPT-5.4 Pro | Winner |
|-----------|-----------|-----------|--------|
| AIME26 | 97.1% | Coming soon | Coming soon |
| Apex | 45.8% | Coming soon | Coming soon |
| Apex Shortlist | 88.6% | Coming soon | Coming soon |
| IPhO 2025 (Theory) | Coming soon | 93.5% | Coming soon |
| FrontierMath (legacy) | Coming soon | 50% | Coming soon |
| FrontierMath v2 (Tiers 1-3) | Coming soon | 50.000% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 37.500% | Coming soon |

## FAQ

### Is there enough evidence to pick between A.X K2 and GPT-5.4 Pro?

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

- [A.X K2 vs A.X series](/compare/a-x-k2-vs-skt-ax)
- [GPT-5.4 Pro vs A.X series](/compare/gpt-5-4-pro-vs-skt-ax)
- [A.X K2 vs GPT-5.4](/compare/a-x-k2-vs-gpt-5-4)
- [GPT-5.4 Pro vs GPT-5.4](/compare/gpt-5-4-vs-gpt-5-4-pro)

## Explore More

- [A.X K2 profile](/models/a-x-k2)
- [GPT-5.4 Pro profile](/models/gpt-5-4-pro)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)