Model comparison
Aion 3.5 vs Gemini 3.8 Flash
Gemini 3.8 Flash has enough public results to be ranked (#11); 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 3.8 Flash in 0 categories; one gap is clear of the uncertainty.
- Gemini 3.8 Flash is cheaper at $0.75 / $3.75 per million input/output tokens, against $3 / $6 for Aion 3.5.
- Gemini 3.8 Flash accepts more context: 1.05M tokens versus 262K.
Side by side
| Aion 3.5 | Gemini 3.8 Flash | |
|---|---|---|
| Provider | AionLabs | |
| Noometry Index | 58.1 | 61.8 |
| Released | — | 2026-09-02 |
| Weights | Proprietary | Proprietary |
| Context window | 262K | 1.05M |
| Max output | 33K | 66K |
| Input $ / M tokens | $3 | $0.75 |
| Output $ / M tokens | $6 | $3.75 |
| Results tracked | 1 | 50 |
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Category by category
Coding Not comparable
Aion 3.5: —, Gemini 3.8 Flash: 59.2 (#15)
| Benchmark | Aion 3.5 | Gemini 3.8 Flash |
|---|---|---|
| DeepSWE | — | 73.8% |
| FrontierCode | — | 41.2% |
| CursorBench | — | 39.6% |
| LMArena WebDev | — | 1584 |
| FrontierSWE | — | 19.6% |
| SciCode | — | 56.6% |
| WeirdML | — | 84.8% |
| LMArena Coding | — | 1510 |
| ALE-Bench | — | 1,270 |
Agentic & Tool Use Not comparable
Aion 3.5: —, Gemini 3.8 Flash: 41.8 (#21)
| Benchmark | Aion 3.5 | Gemini 3.8 Flash |
|---|---|---|
| APEX-Agents | — | 64.3% |
| Remote Labor Index | — | 5.8% |
| GDP.pdf | — | 23.4% |
| Vending-Bench 2 | — | 5,094 |
Reasoning Not comparable
Aion 3.5: —, Gemini 3.8 Flash: 76.9 (#5)
| Benchmark | Aion 3.5 | Gemini 3.8 Flash |
|---|---|---|
| ARC-AGI-2 | — | 89.2% |
| NYT Connections (extended) | — | 97.4% |
| ARC-AGI-1 | — | 98.5% |
| CritPt | — | 18.3% |
| Chess Puzzles | — | 61% |
| LMArena Hard Prompts | — | 1508 |
| Mystery Game Puzzles | — | 47% |
| DTBench | — | 95.7% |
| LMCA | — | 52.9% |
| Surface Evolver Bench | — | 76.9% |
| Epoch Capabilities Index | — | 156.71 |
Math Not comparable
Aion 3.5: —, Gemini 3.8 Flash: 65.3 (#28)
| Benchmark | Aion 3.5 | Gemini 3.8 Flash |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 68.4% |
| FrontierMath Tier 4 | — | 22% |
| OTIS Mock AIME 2024-2025 | — | 98.9% |
| ProofBench | — | 48% |
| LMArena Math | — | 1528 |
Knowledge Not comparable
Aion 3.5: —, Gemini 3.8 Flash: 74.8 (#2)
| Benchmark | Aion 3.5 | Gemini 3.8 Flash |
|---|---|---|
| GPQA Diamond | — | 95.4% |
| Humanity's Last Exam | — | 44.5% |
| SimpleQA Verified | — | 69.7% |
| LMArena Expert | — | 1524 |
Multimodal Not comparable
Aion 3.5: —, Gemini 3.8 Flash: 40.7 (#45)
| Benchmark | Aion 3.5 | Gemini 3.8 Flash |
|---|---|---|
| LMArena Vision | — | 1314 |
| Blueprint-Bench 2 | — | 38.6% |
| Furniture Assembly | — | 31.7% |
Multilingual Not comparable
Aion 3.5: —, Gemini 3.8 Flash: 58.0 (#5)
| Benchmark | Aion 3.5 | Gemini 3.8 Flash |
|---|---|---|
| LMArena Non-English | — | 1491 |
| LMArena Chinese | — | 1554 |
| LMArena French | — | 1498 |
| LMArena German | — | 1493 |
| LMArena Japanese | — | 1502 |
| LMArena Korean | — | 1459 |
| LMArena Russian | — | 1515 |
| LMArena Spanish | — | 1485 |
Instruction Following Not comparable
Aion 3.5: —, Gemini 3.8 Flash: 78.0 (#13)
| Benchmark | Aion 3.5 | Gemini 3.8 Flash |
|---|---|---|
| LMArena Instruction Following | — | 1490 |
Long Context Not comparable
Aion 3.5: —, Gemini 3.8 Flash: 46.3 (#24)
| Benchmark | Aion 3.5 | Gemini 3.8 Flash |
|---|---|---|
| LMArena Longer Query | — | 1508 |
Writing & Preference Aion 3.5 leads
Aion 3.5: 74.9, Gemini 3.8 Flash: 72.2 (#15)
| Benchmark | Aion 3.5 | Gemini 3.8 Flash |
|---|---|---|
| EQ-Bench Creative Writing | 1929 | 1748 |
| LMArena Text | — | 1499 |
| LMArena Creative Writing | — | 1492 |
| LMArena Multi-Turn | — | 1501 |
Frequently asked questions
Is Aion 3.5 better than Gemini 3.8 Flash?
Gemini 3.8 Flash has enough public results to be ranked (#11); Aion 3.5 does not yet, so treat this comparison as directional.
Which is cheaper, Aion 3.5 or Gemini 3.8 Flash?
Gemini 3.8 Flash is cheaper. It lists at $0.75 per million input tokens and $3.75 per million output tokens; Aion 3.5 lists at $3 and $6.
Which has the bigger context window?
Gemini 3.8 Flash does, with 1.05M tokens against 262K.
How many benchmarks do Aion 3.5 and Gemini 3.8 Flash share?
1 benchmark has published results for both models. Aion 3.5 has 1 scored results on Noometry and Gemini 3.8 Flash has 50.