Model comparison
Aion 3.5 vs Muse Spark 1.2
Muse Spark 1.2 has enough public results to be ranked (#48); Aion 3.5 does not yet, so treat this comparison as directional.
Last verified . 1 shared benchmarks.
MetaSummary
- They share 1 benchmark with published results for both. Aion 3.5 scores higher in 1 category and Muse Spark 1.2 in 0 categories; one gap is clear of the uncertainty.
- Muse Spark 1.2 is cheaper at $1.25 / $4.25 per million input/output tokens, against $3 / $6 for Aion 3.5.
- Muse Spark 1.2 accepts more context: 1.05M tokens versus 262K.
Side by side
| Aion 3.5 | Muse Spark 1.2 | |
|---|---|---|
| Provider | AionLabs | Meta |
| Noometry Index | 58.1 | 50.3 |
| Released | — | 2026-08-05 |
| Weights | Proprietary | Proprietary |
| Context window | 262K | 1.05M |
| Max output | 33K | 131K |
| Input $ / M tokens | $3 | $1.25 |
| Output $ / M tokens | $6 | $4.25 |
| Results tracked | 1 | 31 |
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Category by category
Coding Not comparable
Aion 3.5: —, Muse Spark 1.2: 49.2 (#51)
| Benchmark | Aion 3.5 | Muse Spark 1.2 |
|---|---|---|
| DeepSWE | — | 54.9% |
| LMArena WebDev | — | 1533 |
| FrontierSWE | — | 12% |
| SciCode | — | 56.4% |
| WeirdML | — | 60.3% |
| LMArena Coding | — | 1495 |
Agentic & Tool Use Not comparable
Aion 3.5: —, Muse Spark 1.2: 29.4 (#87)
| Benchmark | Aion 3.5 | Muse Spark 1.2 |
|---|---|---|
| APEX-Agents | — | 36.4% |
| GDP.pdf | — | 16% |
Reasoning Not comparable
Aion 3.5: —, Muse Spark 1.2: 51.3 (#34)
| Benchmark | Aion 3.5 | Muse Spark 1.2 |
|---|---|---|
| SimpleBench | — | 74.5% |
| NYT Connections (extended) | — | 79.2% |
| CritPt | — | 17.7% |
| LMArena Hard Prompts | — | 1486 |
| DTBench | — | 94.7% |
| LMCA | — | 48.4% |
| Epoch Capabilities Index | — | 154.87 |
Math Not comparable
Aion 3.5: —, Muse Spark 1.2: 46.4 (#70)
| Benchmark | Aion 3.5 | Muse Spark 1.2 |
|---|---|---|
| ProofBench | — | 43% |
| LMArena Math | — | 1471 |
Knowledge Not comparable
Aion 3.5: —, Muse Spark 1.2: 54.1 (#53)
| Benchmark | Aion 3.5 | Muse Spark 1.2 |
|---|---|---|
| SimpleQA Verified | — | 60.3% |
| LMArena Expert | — | 1480 |
Multimodal Not comparable
Aion 3.5: —, Muse Spark 1.2: 43.4 (#25)
| Benchmark | Aion 3.5 | Muse Spark 1.2 |
|---|---|---|
| LMArena Vision | — | 1305 |
Multilingual Not comparable
Aion 3.5: —, Muse Spark 1.2: 57.1 (#11)
| Benchmark | Aion 3.5 | Muse Spark 1.2 |
|---|---|---|
| LMArena Non-English | — | 1478 |
| LMArena Chinese | — | 1511 |
| LMArena French | — | 1513 |
| LMArena Russian | — | 1487 |
| LMArena Spanish | — | 1498 |
Instruction Following Not comparable
Aion 3.5: —, Muse Spark 1.2: 76.7 (#36)
| Benchmark | Aion 3.5 | Muse Spark 1.2 |
|---|---|---|
| LMArena Instruction Following | — | 1461 |
Long Context Not comparable
Aion 3.5: —, Muse Spark 1.2: 45.2 (#48)
| Benchmark | Aion 3.5 | Muse Spark 1.2 |
|---|---|---|
| LMArena Longer Query | — | 1475 |
Writing & Preference Aion 3.5 leads
Aion 3.5: 74.9, Muse Spark 1.2: 72.3 (#14)
| Benchmark | Aion 3.5 | Muse Spark 1.2 |
|---|---|---|
| EQ-Bench Creative Writing | 1929 | 1840 |
| LMArena Text | — | 1482 |
| LMArena Creative Writing | — | 1449 |
| LMArena Multi-Turn | — | 1494 |
Frequently asked questions
Is Aion 3.5 better than Muse Spark 1.2?
Muse Spark 1.2 has enough public results to be ranked (#48); Aion 3.5 does not yet, so treat this comparison as directional.
Which is cheaper, Aion 3.5 or Muse Spark 1.2?
Muse Spark 1.2 is cheaper. It lists at $1.25 per million input tokens and $4.25 per million output tokens; Aion 3.5 lists at $3 and $6.
Which has the bigger context window?
Muse Spark 1.2 does, with 1.05M tokens against 262K.
How many benchmarks do Aion 3.5 and Muse Spark 1.2 share?
1 benchmark has published results for both models. Aion 3.5 has 1 scored results on Noometry and Muse Spark 1.2 has 31.