Model comparison
Aion 3.5 vs Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview has enough public results to be ranked (#20); Aion 3.5 does not yet, so treat this comparison as directional.
Last verified . 1 shared benchmarks.
GoogleSummary
- They share 1 benchmark with published results for both. Aion 3.5 scores higher in 1 category and Gemini 3.1 Pro Preview in 0 categories; one gap is clear of the uncertainty.
- The widest gap is in writing & preference, where Aion 3.5 leads 74.9 to 66.3.
- Aion 3.5 is cheaper at $3 / $6 per million input/output tokens, against $2 / $12 for Gemini 3.1 Pro Preview.
- Gemini 3.1 Pro Preview accepts more context: 1.05M tokens versus 262K.
Side by side
| Aion 3.5 | Gemini 3.1 Pro Preview | |
|---|---|---|
| Provider | AionLabs | |
| Noometry Index | 57.9 | 56.7 |
| Released | — | 2026-02-19 |
| Weights | Proprietary | Proprietary |
| Context window | 262K | 1.05M |
| Max output | 33K | 66K |
| Input $ / M tokens | $3 | $2 |
| Output $ / M tokens | $6 | $12 |
| Results tracked | 1 | 71 |
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Category by category
Coding Not comparable
Aion 3.5: —, Gemini 3.1 Pro Preview: 42.7 (#88)
| Benchmark | Aion 3.5 | Gemini 3.1 Pro Preview |
|---|---|---|
| SWE-bench Verified | — | 75.6% |
| DeepSWE | — | 11.7% |
| LMArena WebDev | — | 1446 |
| SciCode | — | 58.9% |
| GSO | — | 22.6% |
| WeirdML | — | 72.1% |
| LMArena Coding | — | 1483 |
| MirrorCode | — | 8.9% |
| ALE-Bench | — | 1,161 |
| AlgoTune | — | 2.02 |
Agentic & Tool Use Not comparable
Aion 3.5: —, Gemini 3.1 Pro Preview: 37.7 (#33)
| Benchmark | Aion 3.5 | Gemini 3.1 Pro Preview |
|---|---|---|
| Terminal-Bench | — | 80.2% |
| APEX-Agents | — | 35.3% |
| τ²-bench Banking | — | 26% |
| DeepResearch Bench | — | 47.8% |
| PostTrainBench | — | 22% |
| BALROG | — | 57% |
| ExploitBench | — | 26.1% |
| GBAEval | — | 0.8% |
| GDP.pdf | — | 17% |
| LMArena Search | — | 1211 |
| METR Time Horizons | — | 77% |
| Vending-Bench 2 | — | 3,774 |
Reasoning Not comparable
Aion 3.5: —, Gemini 3.1 Pro Preview: 71.7 (#9)
| Benchmark | Aion 3.5 | Gemini 3.1 Pro Preview |
|---|---|---|
| ARC-AGI-2 | — | 77.1% |
| SimpleBench | — | 79.6% |
| NYT Connections (extended) | — | 97.4% |
| ARC-AGI-1 | — | 98% |
| CritPt | — | 17.7% |
| Chess Puzzles | — | 55% |
| EnigmaEval | — | 36.8% |
| Thematic Generalization | — | 79.4% |
| EBR-Bench | — | 14.3% |
| LMArena Hard Prompts | — | 1484 |
| Mystery Game Puzzles | — | 34% |
| DTBench | — | 97.1% |
| LMCA | — | 53.8% |
| Epoch Capabilities Index | — | 154.92 |
| ForecastBench | — | 59 |
Math Not comparable
Aion 3.5: —, Gemini 3.1 Pro Preview: 61.8 (#28)
| Benchmark | Aion 3.5 | Gemini 3.1 Pro Preview |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 59.6% |
| FrontierMath Tier 4 | — | 26.8% |
| MathArena Final-Answer Competitions | — | 86.5% |
| OTIS Mock AIME 2024-2025 | — | 95.6% |
| ProofBench | — | 26% |
| LMArena Math | — | 1485 |
| FrontierMath (Feb 2025 set) | — | 36.9% |
| FrontierMath Tier 4 (v1) | — | 16.7% |
Knowledge Not comparable
Aion 3.5: —, Gemini 3.1 Pro Preview: 71.8 (#3)
| Benchmark | Aion 3.5 | Gemini 3.1 Pro Preview |
|---|---|---|
| GPQA Diamond | — | 94.4% |
| Humanity's Last Exam | — | 46.4% |
| SimpleQA Verified | — | 73.5% |
| Vectara Hallucination Rate | — | 10.4% |
| LMArena Expert | — | 1484 |
Multimodal Not comparable
Aion 3.5: —, Gemini 3.1 Pro Preview: 38.1 (#60)
| Benchmark | Aion 3.5 | Gemini 3.1 Pro Preview |
|---|---|---|
| LMArena Vision | — | 1296 |
| Blueprint-Bench 2 | — | 26.5% |
| Furniture Assembly | — | 26.7% |
| LMArena Document | — | 1444 |
Multilingual Not comparable
Aion 3.5: —, Gemini 3.1 Pro Preview: 57.1 (#11)
| Benchmark | Aion 3.5 | Gemini 3.1 Pro Preview |
|---|---|---|
| LMArena Non-English | — | 1475 |
| LMArena Chinese | — | 1528 |
| LMArena French | — | 1488 |
| LMArena German | — | 1491 |
| LMArena Japanese | — | 1494 |
| LMArena Korean | — | 1458 |
| LMArena Russian | — | 1496 |
| LMArena Spanish | — | 1480 |
Instruction Following Not comparable
Aion 3.5: —, Gemini 3.1 Pro Preview: 77.1 (#31)
| Benchmark | Aion 3.5 | Gemini 3.1 Pro Preview |
|---|---|---|
| LMArena Instruction Following | — | 1465 |
Long Context Not comparable
Aion 3.5: —, Gemini 3.1 Pro Preview: 47.3 (#17)
| Benchmark | Aion 3.5 | Gemini 3.1 Pro Preview |
|---|---|---|
| CL-bench | — | 20.8% |
| CL-bench Life | — | 16.9% |
| LMArena Longer Query | — | 1482 |
Writing & Preference Aion 3.5 leads
Aion 3.5: 74.9, Gemini 3.1 Pro Preview: 66.3 (#36)
| Benchmark | Aion 3.5 | Gemini 3.1 Pro Preview |
|---|---|---|
| EQ-Bench Creative Writing | 1929 | 1491 |
| LMArena Text | — | 1480 |
| LMArena Creative Writing | — | 1482 |
| EQ-Bench 4 | — | 1142 |
| LMArena Multi-Turn | — | 1486 |
Frequently asked questions
Is Aion 3.5 better than Gemini 3.1 Pro Preview?
Gemini 3.1 Pro Preview has enough public results to be ranked (#20); Aion 3.5 does not yet, so treat this comparison as directional.
Which is cheaper, Aion 3.5 or Gemini 3.1 Pro Preview?
Aion 3.5 is cheaper. It lists at $3 per million input tokens and $6 per million output tokens; Gemini 3.1 Pro Preview lists at $2 and $12.
Which has the bigger context window?
Gemini 3.1 Pro Preview does, with 1.05M tokens against 262K.
How many benchmarks do Aion 3.5 and Gemini 3.1 Pro Preview share?
1 benchmark has published results for both models. Aion 3.5 has 1 scored results on Noometry and Gemini 3.1 Pro Preview has 71.