# A.X K2 vs Claude Fable 5.2

> Side-by-side benchmark comparison for A.X K2 and Claude Fable 5.2 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/a-x-k2-vs-claude-fable-5-2
- 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: A.X K2 and Claude Fable 5.2 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.
- A.X K2 has the lower published output-token price.
- Claude Fable 5.2 has the larger published context window at 1M.

## Model Snapshot

| Property | A.X K2 | Claude Fable 5.2 |
|----------|----------|----------|
| Creator | SK Telecom | Anthropic |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 262K | 1M |
| Independent public score (not head-to-head) | null | 91.19 |
| Benchmarks Covered | 10 | 30 |
| Pricing (input/output) | $0.00 / $0.00 | $8.00 / $40.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- A.X K2 public-lane score: Coming soon
- Claude Fable 5.2 public-lane score: 90.7 (Estimated · #1/132)

| Benchmark | A.X K2 | Claude Fable 5.2 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 36.0% | Coming soon | Coming soon |
| Terminal-Bench 4.0 | Coming soon | 67.60% | Coming soon |
| Terminal-Bench-Science 0.1 | Coming soon | 74.6% | Coming soon |
| AutomationBench | Coming soon | 51.4% | Coming soon |
| OSWorld 2.1 Offline | Coming soon | 89.3% | Coming soon |
| WANDR | Coming soon | 82.1% | Coming soon |
| Remote Labor Index | Coming soon | 41.3% | Coming soon |
| RoboDojo Sim | Coming soon | 64.9% | Coming soon |
| DRACO | Coming soon | 87.7% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- A.X K2 public-lane score: Coming soon
- Claude Fable 5.2 public-lane score: 86.9 (Estimated · #1/158)

| Benchmark | A.X K2 | Claude Fable 5.2 | 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 |
| SWE-bench Pro | Coming soon | 93% | Coming soon |
| SWE Multilingual | Coming soon | 96.6% | Coming soon |
| SWE Multimodal | Coming soon | 74.1% | Coming soon |
| DeepSWE | Coming soon | 74.3% | Coming soon |
| FrontierSWE v2 | Coming soon | 69.9% | Coming soon |
| ProgramBench | Coming soon | 85.6% | Coming soon |
| FrontierCode 2.0 | Coming soon | 49.1% | Coming soon |
| CursorBench 4.0 | Coming soon | 60.0% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- A.X K2 public-lane score: Coming soon
- Claude Fable 5.2 public-lane score: 90.7 (Supported · #1/157)

| Benchmark | A.X K2 | Claude Fable 5.2 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-3 | Coming soon | 65.7% | Coming soon |
| ARC-AGI-3 Provider Adapter | Coming soon | 94.90% | Coming soon |
| STEM Professor Bench | Coming soon | 61.8% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- A.X K2 public-lane score: Coming soon
- Claude Fable 5.2 public-lane score: 89.8 (Estimated · #1/67)

| Benchmark | A.X K2 | Claude Fable 5.2 | Winner |
|-----------|-----------|-----------|--------|
| Chartography (no tools) | Coming soon | 73.4% | Coming soon |
| Chartography (tools) | Coming soon | 91.6% | Coming soon |
| OfficeQA | Coming soon | 83.4% | Coming soon |
| OfficeQA Pro | Coming soon | 72.9% | Coming soon |
| BenchCAD 2.1 | Coming soon | 75.4% | Coming soon |
| BenchCAD 2.1 (tools) | Coming soon | 83.5% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- A.X K2 public-lane score: Coming soon
- Claude Fable 5.2 public-lane score: 97.6 (Supported · #1/179)

| Benchmark | A.X K2 | Claude Fable 5.2 | Winner |
|-----------|-----------|-----------|--------|
| HLE | 27.8% | 74.2% | Claude Fable 5.2 |
| GPQA-D | 85.6% | Coming soon | Coming soon |
| HLE w/o tools | Coming soon | 73.2% | Coming soon |
| PhysicianBench | Coming soon | 64.4% | Coming soon |

### Multilingual

- Winner: Insufficient shared evidence
- A.X K2 public-lane score: Coming soon
- Claude Fable 5.2 public-lane score: Coming soon

| Benchmark | A.X K2 | Claude Fable 5.2 | Winner |
|-----------|-----------|-----------|--------|
| GMMLU | Coming soon | 96.0% | Coming soon |
| MILU | Coming soon | 94.1% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- A.X K2 public-lane score: Coming soon
- Claude Fable 5.2 public-lane score: Coming soon

| Benchmark | A.X K2 | Claude Fable 5.2 | Winner |
|-----------|-----------|-----------|--------|
| IFBench | 75.9% | Coming soon | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- A.X K2 public-lane score: Coming soon
- Claude Fable 5.2 public-lane score: Coming soon

| Benchmark | A.X K2 | Claude Fable 5.2 | Winner |
|-----------|-----------|-----------|--------|
| AIME26 | 97.1% | Coming soon | Coming soon |
| Apex | 45.8% | Coming soon | Coming soon |
| Apex Shortlist | 88.6% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between A.X K2 and Claude Fable 5.2?

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

- [A.X K2 vs A.X series](/compare/a-x-k2-vs-skt-ax)
- [Claude Fable 5.2 vs A.X series](/compare/claude-fable-5-2-vs-skt-ax)
- [A.X K2 vs Claude Fable 5.1](/compare/a-x-k2-vs-claude-fable-5-1)
- [Claude Fable 5.2 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-claude-fable-5-2)

## Explore More

- [A.X K2 profile](/models/a-x-k2)
- [Claude Fable 5.2 profile](/models/claude-fable-5-2)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)