Aion 3.5 Mini vs Solar Mini 4
Solar Mini 4 costs 7.0x less per output token than Aion 3.5 Mini ($0.20 vs $1.40 per million). Updated October 22, 2026; no benchmark has tested both models yet.
- Coding
- No data
- Overall
- No data
- Output $/M
- $1.40
- Coding
- No data
- Overall
- No data
- Output $/M
- $0.20
Aion 3.5 Mini or Solar Mini 4: which to pick
Neither model has a coding score yet, so the two cannot be ranked on coding.
Compare them on price, context and the boards below.
No benchmark has tested both yet. Aion 3.5 Mini has none yet; Solar Mini 4 on SciCode, AA Intelligence Index and Humanity's Last Exam (Artificial Analysis run). Compare them on price and context instead.
Which one for your work
Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.
Coding
Vibe Coding Index, six public coding benchmarks
No call
Neither has a coding score yet.
One side not measured
Intelligence
AA Intelligence Index
No call
Only Solar Mini 4 has a AA Intelligence Index result, 24.1.
Directional only
Web design
Design Arena: websites
No call
Only Solar Mini 4 has a Design Arena: websites result, 1159.
Directional only
Long documents
Listed context window
Solar Mini 4
Solar Mini 4 takes 524K tokens against 262K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Solar Mini 4
Aion 3.5 Mini $0.0014, Solar Mini 4 $0.0001 per turn.
List prices
At a glance
- Coding index
- Aion 3.5 Mini not benchmarked, Solar Mini 4 not benchmarked.
- Widest category
- None yet: no category has been tested on both models.
- Widest single gap
- None yet: no benchmark has tested both models.
- Output price
- Aion 3.5 Mini $1.40 against Solar Mini 4 $0.20 per million output tokens, 7.0x apart.
- Context window
- Aion 3.5 Mini takes 262K tokens, Solar Mini 4 524K.
Benchmark by benchmark
Every board either model has a result on, a category to a fold; bars are each result on a 0 to 100 scale. Only one model is measured on each, so no row names a leader.
CodingDirectional onlySix of these boards feed the Vibe Coding Index1 board measured
| Benchmark | Aion 3.5 Mini | Solar Mini 4 | Leader |
|---|---|---|---|
| SciCode | Not measured | 47.6% | Only Solar Mini 4 measured |
| Neither model has a result on the other 42 boards here | |||
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index1 board measured
| Benchmark | Aion 3.5 Mini | Solar Mini 4 | Leader |
|---|---|---|---|
| AA Intelligence Index | Not measured | 24.1 | Only Solar Mini 4 measured |
| Neither model has a result on the other 1 board here | |||
ReasoningDirectional onlyPublic boards, shown as published, kept out of the index1 board measured
| Benchmark | Aion 3.5 Mini | Solar Mini 4 | Leader |
|---|---|---|---|
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 25.8% | Only Solar Mini 4 measured |
| Neither model has a result on the other 22 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index4 boards measured
| Benchmark | Aion 3.5 Mini | Solar Mini 4 | Leader |
|---|---|---|---|
| Design Arena: websites | Not measured | 1159 | Only Solar Mini 4 measured |
| Design Arena: UI components | Not measured | 1073 | Only Solar Mini 4 measured |
| Design Arena: game dev | Not measured | 1105 | Only Solar Mini 4 measured |
| Design Arena: all code categories | Not measured | 1149 | Only Solar Mini 4 measured |
| Neither model has a result on the other 5 boards here | |||
GeneralDirectional onlyPublic boards, shown as published, kept out of the index1 board measured
| Benchmark | Aion 3.5 Mini | Solar Mini 4 | Leader |
|---|---|---|---|
| Long context reasoning (AA-LCR) | Not measured | 83.3% | Only Solar Mini 4 measured |
| Neither model has a result on the other 47 boards here | |||
What each workload costs
Three fixed token mixes at each model's listed price, so per-token rates become a bill.
Chat turn
1K input + 500 output tokens
Solar Mini 4 costs less
Repository review
50K input + 3K output tokens
Solar Mini 4 costs less
Agent loop
200K input + 10K output tokens
Solar Mini 4 costs less
Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.
Specification differences
The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.
| Specification | AionLabs Aion 3.5 Mini | Upstage Solar Mini 4 |
|---|---|---|
| Maker | Aion Labs | Upstage |
| Weights | No public weights listed | No public weights listed |
| Released | September 23, 2026 | September 23, 2026 |
| Context window | 262K | 524K |
| Input $/Mtok | $0.70 | $0.05 |
| Output $/Mtok | $1.40 | $0.20 |
| Coding index | Not benchmarked | Not benchmarked |
| Independent measurements behind it | 0 | 0 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Aion 3.5 Mini better than Solar Mini 4 for coding?
Neither model has a coding score yet, so the two cannot be ranked on coding. Compare them on price, context and the boards below.
Which is cheaper, Aion 3.5 Mini or Solar Mini 4?
Aion 3.5 Mini costs $0.70 per million input tokens and $1.40 per million output tokens; Solar Mini 4 costs $0.05 and $0.20. Cost per solved task is known for neither of them.
Which has the bigger context window, Aion 3.5 Mini or Solar Mini 4?
Solar Mini 4, with 524K tokens against 262K.
Has any benchmark tested both Aion 3.5 Mini and Solar Mini 4?
No benchmark has tested both yet. Aion 3.5 Mini has none yet; Solar Mini 4 on SciCode, AA Intelligence Index and Humanity's Last Exam (Artificial Analysis run). Compare them on price and context instead. Data as of October 22, 2026.