Hy4 preview vs Solar Mini 4
Solar Mini 4 costs 11.3x less per output token than Hy4 preview ($0.20 vs $2.2509 per million). Updated October 21, 2026; no benchmark has tested both models yet.
- Coding
- 44.3
- Overall
- No data
- Output $/M
- $2.2509
- Coding
- No data
- Overall
- No data
- Output $/M
- $0.20
Hy4 preview or Solar Mini 4: which to pick
Only Hy4 preview has a coding score, 44.3 on the Vibe Coding Index; Solar Mini 4 has none, so the two cannot be ranked on coding.
Pick Solar Mini 4 for output tokens 11.3x cheaper ($0.20 vs $2.2509 per million).
No benchmark has tested both yet. Hy4 preview has results on LMArena WebDev, Terminal-Bench 4 (Vals AI) and Vibe Code Bench (Vals AI); 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
Only Hy4 preview has a coding score, so no call is made.
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
General
Vals Index
No call
Only Hy4 preview has a Vals Index result, 53.2%.
Directional only
Long documents
Listed context window
Hy4 preview
Hy4 preview takes 1.05M tokens against 524K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Solar Mini 4
Hy4 preview $0.0019, Solar Mini 4 $0.0001 per turn.
List prices
At a glance
- Coding index
- Hy4 preview 44.3 from 3 benchmarks, 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
- Hy4 preview $2.2509 against Solar Mini 4 $0.20 per million output tokens, 11.3x apart.
- Context window
- Hy4 preview takes 1.05M 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 Index11 boards measured
| Benchmark | Hy4 preview | Solar Mini 4 | Leader |
|---|---|---|---|
| LMArena WebDev | 1631 | Not measured | Only Hy4 preview measured |
| Terminal-Bench 4 (Vals AI) | 8.1% | Not measured | Only Hy4 preview measured |
| Vibe Code Bench (Vals AI) | 77.5% | Not measured | Only Hy4 preview measured |
| Code migration (Vals AI) | 47.4% | Not measured | Only Hy4 preview measured |
| ProgramBench (Vals AI) | 0.0% | Not measured | Only Hy4 preview measured |
| IOI (Vals AI) | 59.3% | Not measured | Only Hy4 preview measured |
| Terminal-Bench 2.1 (Vals AI) | 55.1% | Not measured | Only Hy4 preview measured |
| CyberBench (Vals AI) | 65.4% | Not measured | Only Hy4 preview measured |
| SciCode | Not measured | 47.6% | Only Solar Mini 4 measured |
| LMArena WebDev: React | 1653 | Not measured | Only Hy4 preview measured |
| LMArena WebDev: HTML | 1620 | Not measured | Only Hy4 preview measured |
| Neither model has a result on the other 28 boards here | |||
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index1 board measured
| Benchmark | Hy4 preview | 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 | |||
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index8 boards measured
| Benchmark | Hy4 preview | Solar Mini 4 | Leader |
|---|---|---|---|
| SREBench (Vals AI) | 2.3% | Not measured | Only Hy4 preview measured |
| Finance Agent (Vals AI) | 55.1% | Not measured | Only Hy4 preview measured |
| Tax Agent Bench (Vals AI) | 32.6% | Not measured | Only Hy4 preview measured |
| Legal Research Bench (Vals AI) | 45.2% | Not measured | Only Hy4 preview measured |
| Harvey's Legal Agent Benchmark (Vals AI) | 8.8% | Not measured | Only Hy4 preview measured |
| Excel Modeling Benchmark (Vals AI) | 58.1% | Not measured | Only Hy4 preview measured |
| BioMysteryBench (Vals AI) | 69.3% | Not measured | Only Hy4 preview measured |
| Terminal-Bench-Science (Vals AI) | 1.4% | Not measured | Only Hy4 preview measured |
| Neither model has a result on the other 33 boards here | |||
ReasoningDirectional onlyPublic boards, shown as published, kept out of the index1 board measured
| Benchmark | Hy4 preview | 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 21 boards here | |||
MathDirectional onlyPublic boards, shown as published, kept out of the index1 board measured
| Benchmark | Hy4 preview | Solar Mini 4 | Leader |
|---|---|---|---|
| ProofBench | 75.0% | Not measured | Only Hy4 preview measured |
| Neither model has a result on the other 12 boards here | |||
KnowledgeDirectional onlyPublic boards, shown as published, kept out of the index2 boards measured
| Benchmark | Hy4 preview | Solar Mini 4 | Leader |
|---|---|---|---|
| LegalBench (Vals AI) | 83.8% | Not measured | Only Hy4 preview measured |
| MedCode (Vals AI) | 43.3% | Not measured | Only Hy4 preview measured |
| Neither model has a result on the other 16 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index3 boards measured
| Benchmark | Hy4 preview | Solar Mini 4 | Leader |
|---|---|---|---|
| Design Arena: websites | Not measured | 1159 | Only Solar Mini 4 measured |
| Design Arena: game dev | Not measured | 1109 | Only Solar Mini 4 measured |
| Design Arena: all code categories | Not measured | 1150 | Only Solar Mini 4 measured |
| Neither model has a result on the other 6 boards here | |||
GeneralDirectional onlyPublic boards, shown as published, kept out of the index4 boards measured
| Benchmark | Hy4 preview | Solar Mini 4 | Leader |
|---|---|---|---|
| Vals Index | 53.2% | Not measured | Only Hy4 preview measured |
| Public Benefits Bench (Vals AI) | 68.6% | Not measured | Only Hy4 preview measured |
| MedScribe (Vals AI) | 83.6% | Not measured | Only Hy4 preview measured |
| Long context reasoning (AA-LCR) | Not measured | 83.3% | Only Solar Mini 4 measured |
| Neither model has a result on the other 42 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 | Tencent Hy4 preview | Upstage Solar Mini 4 |
|---|---|---|
| Maker | Tencent | Upstage |
| Weights | Open weights | No public weights listed |
| Released | August 28, 2026 | September 23, 2026 |
| Context window | 1.05M | 524K |
| Input $/Mtok | $0.7506 | $0.05 |
| Output $/Mtok | $2.2509 | $0.20 |
| Coding index | 44.3 | Not benchmarked |
| Independent measurements behind it | 3 | 0 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Hy4 preview better than Solar Mini 4 for coding?
Only Hy4 preview has a coding score, 44.3 on the Vibe Coding Index; Solar Mini 4 has none, so the two cannot be ranked on coding. Pick Solar Mini 4 for output tokens 11.3x cheaper ($0.20 vs $2.2509 per million).
Which is cheaper, Hy4 preview or Solar Mini 4?
Hy4 preview costs $0.7506 per million input tokens and $2.2509 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, Hy4 preview or Solar Mini 4?
Hy4 preview, with 1.05M tokens against 524K.
Has any benchmark tested both Hy4 preview and Solar Mini 4?
No benchmark has tested both yet. Hy4 preview has results on LMArena WebDev, Terminal-Bench 4 (Vals AI) and Vibe Code Bench (Vals AI); 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 21, 2026.