# Aion 3.5 vs GPT-5.2 Pro

> GPT-5.2 Pro has enough public results to be ranked (#39); Aion 3.5 does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/aion-3-5-vs-gpt-5-2-pro
- Last updated: 2026-10-12
- Shared benchmarks: 0

## Summary

- Aion 3.5 is cheaper at $3 / $6 per million input/output tokens, against $21 / $168 for GPT-5.2 Pro.
- GPT-5.2 Pro accepts more context: 400K tokens versus 262K.

## Snapshot

| | Aion 3.5 | GPT-5.2 Pro |
|---|---|---|
| Provider | AionLabs | OpenAI |
| Noometry Index | 58.1 | 52.3 |
| Rank | — | 39 |
| Context | 262K | 400K |
| Input $/M | $3 | $21 |
| Output $/M | $6 | $168 |
| Weights | Proprietary | Proprietary |

## Reasoning

- Aion 3.5: —
- GPT-5.2 Pro: 51.5 (#33)

| Benchmark | Aion 3.5 | GPT-5.2 Pro |
|---|---|---|
| ARC-AGI-2 | — | 54.2% |
| SimpleBench | — | 57.4% |
| NYT Connections (extended) | — | 79.3% |
| ARC-AGI-1 | — | 90.5% |
| Epoch Capabilities Index | — | 155.4 |

## Math

- Aion 3.5: —
- GPT-5.2 Pro: 65.3 (#29)

| Benchmark | Aion 3.5 | GPT-5.2 Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 74% |
| FrontierMath Tier 4 | — | 46% |
| FrontierMath Tier 4 (v1) | — | 31.3% |

## Writing & Preference

- Aion 3.5: 74.9
- GPT-5.2 Pro: —

| Benchmark | Aion 3.5 | GPT-5.2 Pro |
|---|---|---|
| EQ-Bench Creative Writing | 1929 | — |

## FAQ

### Is Aion 3.5 better than GPT-5.2 Pro?

GPT-5.2 Pro has enough public results to be ranked (#39); Aion 3.5 does not yet, so treat this comparison as directional.

### Which is cheaper, Aion 3.5 or GPT-5.2 Pro?

Aion 3.5 is cheaper. It lists at $3 per million input tokens and $6 per million output tokens; GPT-5.2 Pro lists at $21 and $168.

### Which has the bigger context window?

GPT-5.2 Pro does, with 400K tokens against 262K.

### How many benchmarks do Aion 3.5 and GPT-5.2 Pro share?

0 benchmarks have published results for both models. Aion 3.5 has 1 scored results on Noometry and GPT-5.2 Pro has 8.