Model comparison
Aion 3.5 vs GLM-5.3-Flash
GLM-5.3-Flash has enough public results to be ranked (#41); Aion 3.5 does not yet, so treat this comparison as directional.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in writing & preference, where Aion 3.5 leads 74.9 to 65.3.
- GLM-5.3-Flash is cheaper at $0.15 / $0.50 per million input/output tokens, against $3 / $6 for Aion 3.5.
- GLM-5.3-Flash accepts more context: 1M tokens versus 262K.
- GLM-5.3-Flash has downloadable open weights; the other is API-only.
Side by side
| Aion 3.5 | GLM-5.3-Flash | |
|---|---|---|
| Provider | AionLabs | Z.ai (Zhipu) |
| Noometry Index | 58.1 | 51.8 |
| Released | — | 2026-08-20 |
| Weights | Proprietary | Open |
| Context window | 262K | 1M |
| Max output | 33K | 131K |
| Input $ / M tokens | $3 | $0.15 |
| Output $ / M tokens | $6 | $0.50 |
| Results tracked | 1 | 40 |
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Category by category
Coding Not comparable
Aion 3.5: —, GLM-5.3-Flash: 53.1 (#31)
| Benchmark | Aion 3.5 | GLM-5.3-Flash |
|---|---|---|
| DeepSWE | — | 63.4% |
| FrontierCode | — | 31.8% |
| CursorBench | — | 36.8% |
| LMArena WebDev | — | 1609 |
| FrontierSWE | — | 18.1% |
| SciCode | — | 51.6% |
| LMArena Coding | — | 1508 |
| ALE-Bench | — | 303.55 |
Agentic & Tool Use Not comparable
Aion 3.5: —, GLM-5.3-Flash: 34.2 (#47)
| Benchmark | Aion 3.5 | GLM-5.3-Flash |
|---|---|---|
| APEX-Agents | — | 52.8% |
| GDP.pdf | — | 14% |
Reasoning Not comparable
Aion 3.5: —, GLM-5.3-Flash: 48.0 (#42)
| Benchmark | Aion 3.5 | GLM-5.3-Flash |
|---|---|---|
| ARC-AGI-2 | — | 65.8% |
| ARC-AGI-1 | — | 91% |
| CritPt | — | 15.4% |
| Chess Puzzles | — | 14% |
| LMArena Hard Prompts | — | 1491 |
| Mystery Game Puzzles | — | 8% |
| Surface Evolver Bench | — | 52.5% |
| Bench to the Future 3 | — | 0.15 |
| Epoch Capabilities Index | — | 151.88 |
Math Not comparable
Aion 3.5: —, GLM-5.3-Flash: 53.3 (#47)
| Benchmark | Aion 3.5 | GLM-5.3-Flash |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 55.8% |
| FrontierMath Tier 4 | — | 17.1% |
| OTIS Mock AIME 2024-2025 | — | 93.9% |
| ProofBench | — | 21% |
| LMArena Math | — | 1500 |
Knowledge Not comparable
Aion 3.5: —, GLM-5.3-Flash: 58.4 (#36)
| Benchmark | Aion 3.5 | GLM-5.3-Flash |
|---|---|---|
| GPQA Diamond | — | 90.2% |
| LMArena Expert | — | 1513 |
Multimodal Not comparable
Aion 3.5: —, GLM-5.3-Flash: 42.8 (#27)
| Benchmark | Aion 3.5 | GLM-5.3-Flash |
|---|---|---|
| LMArena Vision | — | 1296 |
Multilingual Not comparable
Aion 3.5: —, GLM-5.3-Flash: 56.0 (#25)
| Benchmark | Aion 3.5 | GLM-5.3-Flash |
|---|---|---|
| LMArena Non-English | — | 1462 |
| LMArena Chinese | — | 1527 |
| LMArena French | — | 1496 |
| LMArena German | — | 1470 |
| LMArena Japanese | — | 1429 |
| LMArena Korean | — | 1446 |
| LMArena Russian | — | 1469 |
| LMArena Spanish | — | 1471 |
Instruction Following Not comparable
Aion 3.5: —, GLM-5.3-Flash: 77.5 (#20)
| Benchmark | Aion 3.5 | GLM-5.3-Flash |
|---|---|---|
| LMArena Instruction Following | — | 1478 |
Long Context Not comparable
Aion 3.5: —, GLM-5.3-Flash: 45.4 (#39)
| Benchmark | Aion 3.5 | GLM-5.3-Flash |
|---|---|---|
| LMArena Longer Query | — | 1482 |
Writing & Preference Aion 3.5 leads
Aion 3.5: 74.9, GLM-5.3-Flash: 65.3 (#50)
| Benchmark | Aion 3.5 | GLM-5.3-Flash |
|---|---|---|
| LMArena Text | — | 1471 |
| LMArena Creative Writing | — | 1442 |
| EQ-Bench Creative Writing | 1929 | — |
| LMArena Multi-Turn | — | 1467 |
Frequently asked questions
Is Aion 3.5 better than GLM-5.3-Flash?
GLM-5.3-Flash has enough public results to be ranked (#41); Aion 3.5 does not yet, so treat this comparison as directional.
Which is cheaper, Aion 3.5 or GLM-5.3-Flash?
GLM-5.3-Flash is cheaper. It lists at $0.15 per million input tokens and $0.50 per million output tokens; Aion 3.5 lists at $3 and $6.
Which has the bigger context window?
GLM-5.3-Flash does, with 1M tokens against 262K.
How many benchmarks do Aion 3.5 and GLM-5.3-Flash share?
0 benchmarks have published results for both models. Aion 3.5 has 1 scored results on Noometry and GLM-5.3-Flash has 40.