# Aion 3.5 vs GPT-5.4 Pro

> GPT-5.4 Pro has enough public results to be ranked (#18); Aion 3.5 does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/aion-3-5-vs-gpt-5-4-pro
- Last updated: 2026-10-12
- Shared benchmarks: 0

## Summary

- Aion 3.5 is cheaper at $3 / $6 per million input/output tokens, against $30 / $180 for GPT-5.4 Pro.
- GPT-5.4 Pro accepts more context: 1.05M tokens versus 262K.

## Snapshot

| | Aion 3.5 | GPT-5.4 Pro |
|---|---|---|
| Provider | AionLabs | OpenAI |
| Noometry Index | 58.1 | 58.9 |
| Rank | — | 18 |
| Context | 262K | 1.05M |
| Input $/M | $3 | $30 |
| Output $/M | $6 | $180 |
| Weights | Proprietary | Proprietary |

## Coding

- Aion 3.5: —
- GPT-5.4 Pro: 43.2 (#90)

| Benchmark | Aion 3.5 | GPT-5.4 Pro |
|---|---|---|
| WeirdML | — | 57.4% |

## Reasoning

- Aion 3.5: —
- GPT-5.4 Pro: 70.7 (#13)

| Benchmark | Aion 3.5 | GPT-5.4 Pro |
|---|---|---|
| ARC-AGI-2 | — | 83.3% |
| SimpleBench | — | 74.1% |
| ARC-AGI-1 | — | 94.5% |
| CritPt | — | 30% |
| Chess Puzzles | — | 58.6% |
| EnigmaEval | — | 23.8% |
| Epoch Capabilities Index | — | 158.93 |

## Math

- Aion 3.5: —
- GPT-5.4 Pro: 72.4 (#22)

| Benchmark | Aion 3.5 | GPT-5.4 Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 82.5% |
| FrontierMath Tier 4 | — | 58.5% |
| FrontierMath (Feb 2025 set) | — | 50% |
| FrontierMath Tier 4 (v1) | — | 37.5% |

## Knowledge

- Aion 3.5: —
- GPT-5.4 Pro: 68.3 (#7)

| Benchmark | Aion 3.5 | GPT-5.4 Pro |
|---|---|---|
| GPQA Diamond | — | 94.6% |
| Humanity's Last Exam | — | 44.3% |
| SimpleQA Verified | — | 46.3% |
| Vectara Hallucination Rate | — | 8.3% |

## Writing & Preference

- Aion 3.5: 74.9
- GPT-5.4 Pro: —

| Benchmark | Aion 3.5 | GPT-5.4 Pro |
|---|---|---|
| EQ-Bench Creative Writing | 1929 | — |

## FAQ

### Is Aion 3.5 better than GPT-5.4 Pro?

GPT-5.4 Pro has enough public results to be ranked (#18); Aion 3.5 does not yet, so treat this comparison as directional.

### Which is cheaper, Aion 3.5 or GPT-5.4 Pro?

Aion 3.5 is cheaper. It lists at $3 per million input tokens and $6 per million output tokens; GPT-5.4 Pro lists at $30 and $180.

### Which has the bigger context window?

GPT-5.4 Pro does, with 1.05M tokens against 262K.

### How many benchmarks do Aion 3.5 and GPT-5.4 Pro share?

0 benchmarks have published results for both models. Aion 3.5 has 1 scored results on Noometry and GPT-5.4 Pro has 16.