Model comparison
Aion 3.5 vs GPT-5.2 Pro
GPT-5.2 Pro has enough public results to be ranked (#34); Aion 3.5 does not yet, so treat this comparison as directional.
Last verified . 0 shared benchmarks.
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.
Side by side
| Aion 3.5 | GPT-5.2 Pro | |
|---|---|---|
| Provider | AionLabs | OpenAI |
| Noometry Index | 57.9 | 52.2 |
| Released | — | 2025-12-11 |
| Weights | Proprietary | Proprietary |
| Context window | 262K | 400K |
| Max output | 33K | 128K |
| Input $ / M tokens | $3 | $21 |
| Output $ / M tokens | $6 | $168 |
| Results tracked | 1 | 8 |
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Category by category
Reasoning Not comparable
Aion 3.5: —, GPT-5.2 Pro: 51.8 (#31)
| 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 | — | 155.41 |
Math Not comparable
Aion 3.5: —, GPT-5.2 Pro: 64.8 (#23)
| 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 Not comparable
Aion 3.5: 74.9, GPT-5.2 Pro: —
| Benchmark | Aion 3.5 | GPT-5.2 Pro |
|---|---|---|
| EQ-Bench Creative Writing | 1929 | — |
Frequently asked questions
Is Aion 3.5 better than GPT-5.2 Pro?
GPT-5.2 Pro has enough public results to be ranked (#34); 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.