GPT-5.4 Mini vs Solar Pro 4
Solar Pro 4 leads GPT-5.4 Mini on the Artificial Analysis Intelligence Index, 28.2 to 24.1, and Solar Pro 4 costs 7.5x less per output token ($0.60 vs $4.50 per million). Updated October 21, 2026; 38 benchmarks have a result for both.
GPT-5.4 Mini or Solar Pro 4: which to pick
Only GPT-5.4 Mini has a coding score, 35.8 on the Vibe Coding Index; Solar Pro 4 has none, so the two cannot be ranked on coding.
Pick Solar Pro 4 for output tokens 7.5x cheaper ($0.60 vs $4.50 per million) and a larger context window (524K against 400K tokens).
- Shared results
- 38
- GPT-5.4 Mini only
- 51
- Solar Pro 4 only
- 7
- Like-for-like categories
- 6 of 9
Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.
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 GPT-5.4 Mini has a coding score, so no call is made.
One side not measured
Intelligence
AA Intelligence Index
Solar Pro 4
Solar Pro 4 leads, 28.2 against 24.1.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only GPT-5.4 Mini has a AA Agentic Index result, 17.9.
Directional only
Reasoning
GPQA Diamond
No call
Only GPT-5.4 Mini has a GPQA Diamond result, 83.1%.
Directional only
Math
AIME
No call
Only GPT-5.4 Mini has a AIME result, 95.6%.
Directional only
Knowledge
MMLU Pro
No call
Only GPT-5.4 Mini has a MMLU Pro result, 84.5%.
Directional only
Web design
Design Arena: websites
No call
Only Solar Pro 4 has a Design Arena: websites result, 1176.
Directional only
Long documents
Listed context window
Solar Pro 4
Solar Pro 4 takes 524K tokens against 400K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Solar Pro 4
GPT-5.4 Mini $0.0030, Solar Pro 4 $0.0004 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only GPT-5.4 Mini has the number, $0.70.
Directional only
At a glance
- Coding index
- GPT-5.4 Mini 35.8 from 5 benchmarks, Solar Pro 4 not benchmarked.
- Widest category
- Coding, 7.2 points apart on average over 8 shared benchmarks.
- Widest single gap
- ALE-Bench: GPT-5.4 Mini 1188.6 against Solar Pro 4 179.3, 33.6 points apart on a 0 to 100 scale.
- Output price
- GPT-5.4 Mini $4.50 against Solar Pro 4 $0.60 per million output tokens, 7.5x apart.
- Context window
- GPT-5.4 Mini takes 400K tokens, Solar Pro 4 524K.
Benchmark by benchmark
First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.
| Category | GPT-5.4 Mini | Bars | Solar Pro 4 | Ties |
|---|---|---|---|---|
| Coding | 8 | 0 | ||
| Intelligence | 0 | 1 | ||
| Reasoning | 2 | 3 | ||
| Math | 1 | 1 | ||
| Knowledge | 4 | 0 | ||
| General | 15 | 3 | ||
| All shared boards | 30 | 8 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index80
| Benchmark | GPT-5.4 Mini | Solar Pro 4 | Leader |
|---|---|---|---|
| LMArena WebDev | 1397 | 1371 | GPT-5.4 Mini |
| AA Coding Index | 56.1 | 52.7 | GPT-5.4 Mini |
| LiveCodeBench (Vals AI) | 81.5% | Not measured | Only GPT-5.4 Mini measured |
| SWE-bench Verified (Vals AI) | 73.0% | Not measured | Only GPT-5.4 Mini measured |
| Terminal-Bench 4 (Vals AI) | 2.5% | Not measured | Only GPT-5.4 Mini measured |
| Vibe Code Bench (Vals AI) | 48.0% | Not measured | Only GPT-5.4 Mini measured |
| Code migration (Vals AI) | 12.9% | Not measured | Only GPT-5.4 Mini measured |
| ProgramBench (Vals AI) | 0.0% | Not measured | Only GPT-5.4 Mini measured |
| Terminal-Bench 2.1 (Vals AI) | 54.7% | Not measured | Only GPT-5.4 Mini measured |
| SciCode | 52.1% | 48.0% | GPT-5.4 Mini |
| Terminal-Bench Hard (Artificial Analysis run) | 52.3% | Not measured | Only GPT-5.4 Mini measured |
| FrontierCode | 27.0% | Not measured | Only GPT-5.4 Mini measured |
| WeirdML | 60.3% | Not measured | Only GPT-5.4 Mini measured |
| ALE-Bench | 1188.6 | 179.3 | GPT-5.4 Mini |
| LMArena Text: coding | 1438 | 1438 | GPT-5.4 Mini |
| LMArena Text: software and IT | 1436 | 1431 | GPT-5.4 Mini |
| LMArena WebDev: React | 1386 | 1363 | GPT-5.4 Mini |
| LMArena WebDev: HTML | 1419 | 1371 | GPT-5.4 Mini |
| Neither model has a result on the other 21 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | GPT-5.4 Mini | Solar Pro 4 | Leader |
|---|---|---|---|
| AA Intelligence Index | 24.1 | 28.2 | Solar Pro 4 |
| Epoch Capabilities Index | 148.7 | Not measured | Only GPT-5.4 Mini measured |
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
| Benchmark | GPT-5.4 Mini | Solar Pro 4 | Leader |
|---|---|---|---|
| AA Agentic Index | 17.9 | Not measured | Only GPT-5.4 Mini measured |
| Design Arena: agents building web apps | Not measured | 1105 | Only Solar Pro 4 measured |
| Finance Agent (Vals AI) | 45.4% | Not measured | Only GPT-5.4 Mini measured |
| Tax Agent Bench (Vals AI) | 8.8% | Not measured | Only GPT-5.4 Mini measured |
| Legal Research Bench (Vals AI) | 12.5% | Not measured | Only GPT-5.4 Mini measured |
| Excel Modeling Benchmark (Vals AI) | 45.4% | Not measured | Only GPT-5.4 Mini measured |
| τ²-Bench Telecom | 83.3% | Not measured | Only GPT-5.4 Mini measured |
| DeepResearch Bench | 36.3% | Not measured | Only GPT-5.4 Mini measured |
| Neither model has a result on the other 33 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index23
| Benchmark | GPT-5.4 Mini | Solar Pro 4 | Leader |
|---|---|---|---|
| GPQA Diamond | 83.1% | Not measured | Only GPT-5.4 Mini measured |
| MMMU Pro (Vals AI) | 79.3% | Not measured | Only GPT-5.4 Mini measured |
| GPQA Diamond (Artificial Analysis run) | 87.5% | 89.1% | Solar Pro 4 |
| Humanity's Last Exam (Artificial Analysis run) | 28.1% | 29.8% | Solar Pro 4 |
| GPQA Diamond (Epoch AI run) | 86.9% | Not measured | Only GPT-5.4 Mini measured |
| ARC-AGI | 63.7% | Not measured | Only GPT-5.4 Mini measured |
| ARC-AGI-2 | 18.9% | Not measured | Only GPT-5.4 Mini measured |
| Chess puzzles | 23.0% | Not measured | Only GPT-5.4 Mini measured |
| Mystery game puzzles | 11.0% | Not measured | Only GPT-5.4 Mini measured |
| LMArena Text: hard prompts | 1424 | 1400 | GPT-5.4 Mini |
| LMArena Text: expert | 1435 | 1428 | GPT-5.4 Mini |
| LMArena Text: hard prompts in English | 1420 | 1427 | Solar Pro 4 |
| LMArena Vision: diagrams | 1266 | Not measured | Only GPT-5.4 Mini measured |
| LMArena Vision: homework | 1285 | Not measured | Only GPT-5.4 Mini measured |
| Kagi LLM Benchmark | 37.9% | Not measured | Only GPT-5.4 Mini measured |
| Neither model has a result on the other 7 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index11
| Benchmark | GPT-5.4 Mini | Solar Pro 4 | Leader |
|---|---|---|---|
| AIME | 95.6% | Not measured | Only GPT-5.4 Mini measured |
| OTIS Mock AIME | 88.9% | Not measured | Only GPT-5.4 Mini measured |
| FrontierMath, tiers 1 to 3 | 51.2% | Not measured | Only GPT-5.4 Mini measured |
| FrontierMath, tier 4 | 9.8% | Not measured | Only GPT-5.4 Mini measured |
| ProofBench | 21.0% | Not measured | Only GPT-5.4 Mini measured |
| LMArena Text: math | 1418 | 1421 | Solar Pro 4 |
| LMArena Text: mathematical work | 1429 | 1427 | GPT-5.4 Mini |
| Neither model has a result on the other 6 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40
| Benchmark | GPT-5.4 Mini | Solar Pro 4 | Leader |
|---|---|---|---|
| MMLU Pro | 84.5% | Not measured | Only GPT-5.4 Mini measured |
| CaseLaw (Vals AI) | 51.7% | Not measured | Only GPT-5.4 Mini measured |
| CorpFin (Vals AI) | 60.9% | Not measured | Only GPT-5.4 Mini measured |
| TaxEval (Vals AI) | 71.2% | Not measured | Only GPT-5.4 Mini measured |
| MortgageTax (Vals AI) | 63.5% | Not measured | Only GPT-5.4 Mini measured |
| SimpleQA Verified | 29.4% | Not measured | Only GPT-5.4 Mini measured |
| LMArena Text: science | 1417 | 1404 | GPT-5.4 Mini |
| LMArena Text: medicine and healthcare | 1395 | 1374 | GPT-5.4 Mini |
| LMArena Text: legal and government | 1414 | 1383 | GPT-5.4 Mini |
| LMArena Text: business and finance | 1418 | 1381 | GPT-5.4 Mini |
| Neither model has a result on the other 8 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index6 boards, none shared
| Benchmark | GPT-5.4 Mini | Solar Pro 4 | Leader |
|---|---|---|---|
| Design Arena: websites | Not measured | 1176 | Only Solar Pro 4 measured |
| Design Arena: UI components | Not measured | 1150 | Only Solar Pro 4 measured |
| Design Arena: game dev | Not measured | 1170 | Only Solar Pro 4 measured |
| Design Arena: data viz | Not measured | 1177 | Only Solar Pro 4 measured |
| Design Arena: 3D | Not measured | 1178 | Only Solar Pro 4 measured |
| Design Arena: all code categories | Not measured | 1182 | Only Solar Pro 4 measured |
| Neither model has a result on the other 3 boards here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index153
| Benchmark | GPT-5.4 Mini | Solar Pro 4 | Leader |
|---|---|---|---|
| SAGE (Vals AI) | 50.8% | Not measured | Only GPT-5.4 Mini measured |
| Vals Multimodal Index | 54.2% | Not measured | Only GPT-5.4 Mini measured |
| IFBench | 73.3% | Not measured | Only GPT-5.4 Mini measured |
| Long context reasoning (AA-LCR) | 77.0% | 70.7% | GPT-5.4 Mini |
| DTBench | 80.0% | Not measured | Only GPT-5.4 Mini measured |
| LMCA | 40.8% | Not measured | Only GPT-5.4 Mini measured |
| LMArena Text | 1412 | 1388 | GPT-5.4 Mini |
| LMArena Text: instruction following | 1405 | 1375 | GPT-5.4 Mini |
| LMArena Text: creative writing | 1370 | 1317 | GPT-5.4 Mini |
| LMArena Vision | 1245 | Not measured | Only GPT-5.4 Mini measured |
| LMArena Text: English | 1412 | 1414 | Solar Pro 4 |
| LMArena Text: non-English | 1405 | 1363 | GPT-5.4 Mini |
| LMArena Text: Chinese | 1446 | 1422 | GPT-5.4 Mini |
| LMArena Text: German | 1408 | 1358 | GPT-5.4 Mini |
| LMArena Text: Japanese | 1375 | 1320 | GPT-5.4 Mini |
| LMArena Text: Korean | 1370 | 1383 | Solar Pro 4 |
| LMArena Text: French | 1441 | 1400 | GPT-5.4 Mini |
| LMArena Text: Spanish | 1405 | 1409 | Solar Pro 4 |
| LMArena Text: Russian | 1417 | 1357 | GPT-5.4 Mini |
| LMArena Text: Polish | 1415 | 1304 | GPT-5.4 Mini |
| LMArena Text: multi-turn | 1429 | 1385 | GPT-5.4 Mini |
| LMArena Text: longer queries | 1408 | 1382 | GPT-5.4 Mini |
| LMArena Text: writing and language | 1393 | 1344 | GPT-5.4 Mini |
| LMArena Text: entertainment and media | 1373 | 1332 | GPT-5.4 Mini |
| LMArena Vision: English | 1244 | Not measured | Only GPT-5.4 Mini measured |
| LMArena Vision: Chinese | 1286 | Not measured | Only GPT-5.4 Mini measured |
| LMArena Vision: reading text | 1253 | Not measured | Only GPT-5.4 Mini measured |
| LMArena Vision: humor | 1235 | Not measured | Only GPT-5.4 Mini measured |
| LMArena Vision: recognizing things | 1218 | Not measured | Only GPT-5.4 Mini measured |
| LMArena Vision: creative writing | 1222 | Not measured | Only GPT-5.4 Mini measured |
| Neither model has a result on the other 16 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | GPT-5.4 Mini | Solar Pro 4 | Leader |
|---|---|---|---|
| Neither model has a result on 5 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 Pro 4 costs less
Repository review
50K input + 3K output tokens
Solar Pro 4 costs less
Agent loop
200K input + 10K output tokens
Solar Pro 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 | OpenAI GPT-5.4 Mini | Upstage Solar Pro 4 |
|---|---|---|
| Maker | OpenAI | Upstage |
| Weights | No public weights listed | No public weights listed |
| Released | March 17, 2026 | August 10, 2026 |
| Context window | 400K | 524K |
| Input $/Mtok | $0.75 | $0.15 |
| Output $/Mtok | $4.50 | $0.60 |
| Coding index | 35.8 | Not benchmarked |
| Independent measurements behind it | 5 | 1 |
| Cost per solved task | $0.70 | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is GPT-5.4 Mini better than Solar Pro 4 for coding?
Only GPT-5.4 Mini has a coding score, 35.8 on the Vibe Coding Index; Solar Pro 4 has none, so the two cannot be ranked on coding. Pick Solar Pro 4 for output tokens 7.5x cheaper ($0.60 vs $4.50 per million) and a larger context window (524K against 400K tokens).
Which is cheaper, GPT-5.4 Mini or Solar Pro 4?
GPT-5.4 Mini costs $0.75 per million input tokens and $4.50 per million output tokens; Solar Pro 4 costs $0.15 and $0.60. Cost per solved task is known for GPT-5.4 Mini only.
Which has the bigger context window, GPT-5.4 Mini or Solar Pro 4?
Solar Pro 4, with 524K tokens against 400K.
How many benchmarks is the GPT-5.4 Mini vs Solar Pro 4 comparison based on?
38 benchmarks have a result for both models as of October 21, 2026. GPT-5.4 Mini's coding index rests on 5 independent benchmarks and Solar Pro 4's on 1. Where only one model has a result, the page says so instead of naming a winner.