Model comparison
Aion 3.5 vs GPT-5.5 Pro
GPT-5.5 Pro has enough public results to be ranked (#7); 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 $30 / $180 for GPT-5.5 Pro.
- GPT-5.5 Pro accepts more context: 1.05M tokens versus 262K.
Side by side
| Aion 3.5 | GPT-5.5 Pro | |
|---|---|---|
| Provider | AionLabs | OpenAI |
| Noometry Index | 57.9 | 64.3 |
| Released | — | 2026-04-23 |
| Weights | Proprietary | Proprietary |
| Context window | 262K | 1.05M |
| Max output | 33K | 128K |
| Input $ / M tokens | $3 | $30 |
| Output $ / M tokens | $6 | $180 |
| Results tracked | 1 | 14 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Reasoning Not comparable
Aion 3.5: —, GPT-5.5 Pro: 73.6 (#7)
| Benchmark | Aion 3.5 | GPT-5.5 Pro |
|---|---|---|
| ARC-AGI-2 | — | 84.6% |
| SimpleBench | — | 76.9% |
| ARC-AGI-1 | — | 96.5% |
| CritPt | — | 30.6% |
| Chess Puzzles | — | 64% |
| DTBench | — | 96% |
| LMCA | — | 53.9% |
| Epoch Capabilities Index | — | 162.45 |
Math Not comparable
Aion 3.5: —, GPT-5.5 Pro: 83.8 (#8)
| Benchmark | Aion 3.5 | GPT-5.5 Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 87.7% |
| FrontierMath Tier 4 | — | 78% |
| OTIS Mock AIME 2024-2025 | — | 100% |
| FrontierMath (Feb 2025 set) | — | 52.4% |
| FrontierMath Tier 4 (v1) | — | 39.6% |
Knowledge Not comparable
Aion 3.5: —, GPT-5.5 Pro: 64.2 (#17)
| Benchmark | Aion 3.5 | GPT-5.5 Pro |
|---|---|---|
| GPQA Diamond | — | 93.9% |
Writing & Preference Not comparable
Aion 3.5: 74.9, GPT-5.5 Pro: —
| Benchmark | Aion 3.5 | GPT-5.5 Pro |
|---|---|---|
| EQ-Bench Creative Writing | 1929 | — |
Frequently asked questions
Is Aion 3.5 better than GPT-5.5 Pro?
GPT-5.5 Pro has enough public results to be ranked (#7); Aion 3.5 does not yet, so treat this comparison as directional.
Which is cheaper, Aion 3.5 or GPT-5.5 Pro?
Aion 3.5 is cheaper. It lists at $3 per million input tokens and $6 per million output tokens; GPT-5.5 Pro lists at $30 and $180.
Which has the bigger context window?
GPT-5.5 Pro does, with 1.05M tokens against 262K.
How many benchmarks do Aion 3.5 and GPT-5.5 Pro share?
0 benchmarks have published results for both models. Aion 3.5 has 1 scored results on Noometry and GPT-5.5 Pro has 14.