Claude Haiku 4.5 vs Solar Pro 4
Updated October 21, 2026. 39 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.
Decision reading
Pick Claude Haiku 4.5 for coding: it scores 49.8 on the Vibe Coding Index against 24.4 for Solar Pro 4.
Pick Solar Pro 4 when output tokens cost 8.3x less, or when the context window is larger, 524K against 200K tokens.
- Shared results
- 39
- Claude Haiku 4.5 only
- 55
- Solar Pro 4 only
- 6
- Like-for-like categories
- 7 of 9
Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.
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, four public coding benchmarks
Claude Haiku 4.5
Claude Haiku 4.5 scores 49.8 against 24.4.
3 and 1 benchmarks behind the scores
Intelligence
AA Intelligence Index
Solar Pro 4
Solar Pro 4 leads, 28.2 against 16.9.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Claude Haiku 4.5 has a AA Agentic Index result, 8.0.
Directional only
Reasoning
GPQA Diamond
No call
Only Claude Haiku 4.5 has a GPQA Diamond result, 72.2%.
Directional only
Math
AIME
No call
Only Claude Haiku 4.5 has a AIME result, 82.7%.
Directional only
Knowledge
MMLU Pro
No call
Only Claude Haiku 4.5 has a MMLU Pro result, 78.7%.
Directional only
Web design
Design Arena: websites
Solar Pro 4
Solar Pro 4 leads, 1176 against 1122.
Same board, both measured
Long documents
Listed context window
Solar Pro 4
Solar Pro 4 takes 524K tokens against 200K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Solar Pro 4
Claude Haiku 4.5 $0.0035, Solar Pro 4 $0.0004 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Claude Haiku 4.5 has the number, $0.56.
Directional only
At a glance
- Coding index
- Claude Haiku 4.5 49.8 from 3 benchmarks, Solar Pro 4 24.4 from 1 benchmark.
- Widest category
- Intelligence, 11.3 points apart on average over 1 shared benchmark.
- Widest single gap
- Design Arena: 3D: Claude Haiku 4.5 1072 against Solar Pro 4 1178, 13.3 points apart on a 0 to 100 scale.
- Output price
- Claude Haiku 4.5 $5.00 against Solar Pro 4 $0.60 per million output tokens, 8.3x apart.
- Context window
- Claude Haiku 4.5 takes 200K 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 | Claude Haiku 4.5 | Bars | Solar Pro 4 | Ties |
|---|---|---|---|---|
| Coding | 2 | 4 | ||
| Intelligence | 0 | 1 | ||
| Reasoning | 3 | 0 | ||
| Math | 1 | 1 | ||
| Knowledge | 4 | 0 | ||
| Web design | 0 | 6 | ||
| General | 15 | 2 | ||
| All shared boards | 25 | 14 |
CodingLike-for-likeFour of these boards feed the Vibe Coding Index24
| Benchmark | Claude Haiku 4.5 | Solar Pro 4 | Leader |
|---|---|---|---|
| SWE-bench Verified | 66.6% | Not measured | Only Claude Haiku 4.5 measured |
| SWE-bench Multilingual | 64.7% | Not measured | Only Claude Haiku 4.5 measured |
| LiveBench coding | 48.1% | Not measured | Only Claude Haiku 4.5 measured |
| LMArena WebDev | 1330 | 1371 | Solar Pro 4 |
| AA Coding Index | 43.9 | 52.7 | Solar Pro 4 |
| LiveCodeBench (Vals AI) | 41.2% | Not measured | Only Claude Haiku 4.5 measured |
| SWE-bench Verified (Vals AI) | 66.6% | Not measured | Only Claude Haiku 4.5 measured |
| Vibe Code Bench (Vals AI) | 11.4% | Not measured | Only Claude Haiku 4.5 measured |
| Code migration (Vals AI) | 7.5% | Not measured | Only Claude Haiku 4.5 measured |
| ProgramBench (Vals AI) | 0.0% | Not measured | Only Claude Haiku 4.5 measured |
| Terminal-Bench 2.1 (Vals AI) | 43.8% | Not measured | Only Claude Haiku 4.5 measured |
| SciCode | Not measured | 48.0% | Only Solar Pro 4 measured |
| Terminal-Bench | 35.5% | Not measured | Only Claude Haiku 4.5 measured |
| WeirdML | 45.4% | Not measured | Only Claude Haiku 4.5 measured |
| ALE-Bench | Not measured | 179.3 | Only Solar Pro 4 measured |
| LMArena Text: coding | 1454 | 1438 | Claude Haiku 4.5 |
| LMArena Text: software and IT | 1439 | 1431 | Claude Haiku 4.5 |
| LMArena WebDev: React | 1326 | 1363 | Solar Pro 4 |
| LMArena WebDev: HTML | 1318 | 1371 | Solar Pro 4 |
| Neither model has a result on the other 19 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | Claude Haiku 4.5 | Solar Pro 4 | Leader |
|---|---|---|---|
| AA Intelligence Index | 16.9 | 28.2 | Solar Pro 4 |
| Epoch Capabilities Index | 142.2 | Not measured | Only Claude Haiku 4.5 measured |
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index12 boards, none shared
| Benchmark | Claude Haiku 4.5 | Solar Pro 4 | Leader |
|---|---|---|---|
| AA Agentic Index | 8.0 | Not measured | Only Claude Haiku 4.5 measured |
| Design Arena: agents building web apps | Not measured | 1105 | Only Solar Pro 4 measured |
| LiveBench research | 42.2% | Not measured | Only Claude Haiku 4.5 measured |
| LiveBench browser | 40.0% | Not measured | Only Claude Haiku 4.5 measured |
| LiveBench long agentic | 11.1% | Not measured | Only Claude Haiku 4.5 measured |
| Finance Agent (Vals AI) | 31.0% | Not measured | Only Claude Haiku 4.5 measured |
| Tax Agent Bench (Vals AI) | 5.9% | Not measured | Only Claude Haiku 4.5 measured |
| Legal Research Bench (Vals AI) | 10.6% | Not measured | Only Claude Haiku 4.5 measured |
| Excel Modeling Benchmark (Vals AI) | 22.7% | Not measured | Only Claude Haiku 4.5 measured |
| BALROG | 31.2% | Not measured | Only Claude Haiku 4.5 measured |
| DeepResearch Bench | 45.5% | Not measured | Only Claude Haiku 4.5 measured |
| Vending-Bench 2 | $459 | Not measured | Only Claude Haiku 4.5 measured |
| Neither model has a result on the other 27 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index30
| Benchmark | Claude Haiku 4.5 | Solar Pro 4 | Leader |
|---|---|---|---|
| GPQA Diamond | 72.2% | Not measured | Only Claude Haiku 4.5 measured |
| LiveBench reasoning | 61.7% | Not measured | Only Claude Haiku 4.5 measured |
| MMMU Pro (Vals AI) | 46.1% | Not measured | Only Claude Haiku 4.5 measured |
| GPQA Diamond (Artificial Analysis run) | Not measured | 89.1% | Only Solar Pro 4 measured |
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 29.8% | Only Solar Pro 4 measured |
| GPQA Diamond (Epoch AI run) | 71.2% | Not measured | Only Claude Haiku 4.5 measured |
| ARC-AGI | 47.7% | Not measured | Only Claude Haiku 4.5 measured |
| ARC-AGI-2 | 4.0% | Not measured | Only Claude Haiku 4.5 measured |
| Chess puzzles | 8.0% | Not measured | Only Claude Haiku 4.5 measured |
| LMArena Text: hard prompts | 1421 | 1400 | Claude Haiku 4.5 |
| LMArena Text: expert | 1443 | 1428 | Claude Haiku 4.5 |
| LMArena Text: hard prompts in English | 1435 | 1427 | Claude Haiku 4.5 |
| Neither model has a result on the other 9 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index11
| Benchmark | Claude Haiku 4.5 | Solar Pro 4 | Leader |
|---|---|---|---|
| AIME | 82.7% | Not measured | Only Claude Haiku 4.5 measured |
| MGSM (Vals AI) | 92.2% | Not measured | Only Claude Haiku 4.5 measured |
| OTIS Mock AIME | 66.7% | Not measured | Only Claude Haiku 4.5 measured |
| MATH level 5 | 96.4% | Not measured | Only Claude Haiku 4.5 measured |
| LMArena Text: math | 1398 | 1421 | Solar Pro 4 |
| LMArena Text: mathematical work | 1430 | 1427 | Claude Haiku 4.5 |
| Neither model has a result on the other 7 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40
| Benchmark | Claude Haiku 4.5 | Solar Pro 4 | Leader |
|---|---|---|---|
| MMLU Pro | 78.7% | Not measured | Only Claude Haiku 4.5 measured |
| LegalBench (Vals AI) | 81.2% | Not measured | Only Claude Haiku 4.5 measured |
| CaseLaw (Vals AI) | 56.5% | Not measured | Only Claude Haiku 4.5 measured |
| CorpFin (Vals AI) | 60.6% | Not measured | Only Claude Haiku 4.5 measured |
| TaxEval (Vals AI) | 67.5% | Not measured | Only Claude Haiku 4.5 measured |
| MortgageTax (Vals AI) | 62.2% | Not measured | Only Claude Haiku 4.5 measured |
| MedQA (Vals AI) | 79.6% | Not measured | Only Claude Haiku 4.5 measured |
| MedCode (Vals AI) | 32.7% | Not measured | Only Claude Haiku 4.5 measured |
| SimpleQA Verified | 13.2% | Not measured | Only Claude Haiku 4.5 measured |
| LMArena Text: science | 1406 | 1404 | Claude Haiku 4.5 |
| LMArena Text: medicine and healthcare | 1394 | 1374 | Claude Haiku 4.5 |
| LMArena Text: legal and government | 1400 | 1383 | Claude Haiku 4.5 |
| LMArena Text: business and finance | 1400 | 1381 | Claude Haiku 4.5 |
| Neither model has a result on the other 4 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index06
| Benchmark | Claude Haiku 4.5 | Solar Pro 4 | Leader |
|---|---|---|---|
| Design Arena: websites | 1122 | 1176 | Solar Pro 4 |
| Design Arena: UI components | 1100 | 1150 | Solar Pro 4 |
| Design Arena: game dev | 1097 | 1170 | Solar Pro 4 |
| Design Arena: data viz | 1124 | 1177 | Solar Pro 4 |
| Design Arena: 3D | 1072 | 1178 | Solar Pro 4 |
| Design Arena: all code categories | 1115 | 1182 | Solar Pro 4 |
| Design Arena: SVG | 1025 | Not measured | Only Claude Haiku 4.5 measured |
| Design Arena: ASCII art | 1139 | Not measured | Only Claude Haiku 4.5 measured |
| LiveBench design | 59.9% | Not measured | Only Claude Haiku 4.5 measured |
GeneralLike-for-likePublic boards, shown as published, kept out of the index152
| Benchmark | Claude Haiku 4.5 | Solar Pro 4 | Leader |
|---|---|---|---|
| LiveBench data analysis | 59.3% | Not measured | Only Claude Haiku 4.5 measured |
| Public Benefits Bench (Vals AI) | 54.3% | Not measured | Only Claude Haiku 4.5 measured |
| SAGE (Vals AI) | 31.8% | Not measured | Only Claude Haiku 4.5 measured |
| MedScribe (Vals AI) | 85.2% | Not measured | Only Claude Haiku 4.5 measured |
| Vals Multimodal Index | 42.9% | Not measured | Only Claude Haiku 4.5 measured |
| Long context reasoning (AA-LCR) | Not measured | 70.7% | Only Solar Pro 4 measured |
| DTBench | 73.6% | Not measured | Only Claude Haiku 4.5 measured |
| LMCA | 30.9% | Not measured | Only Claude Haiku 4.5 measured |
| ExploitBench | 13.7% | Not measured | Only Claude Haiku 4.5 measured |
| LMArena Text | 1397 | 1388 | Claude Haiku 4.5 |
| LMArena Text: instruction following | 1414 | 1375 | Claude Haiku 4.5 |
| LMArena Text: creative writing | 1371 | 1317 | Claude Haiku 4.5 |
| LMArena Text: English | 1414 | 1414 | Claude Haiku 4.5 |
| LMArena Text: non-English | 1377 | 1363 | Claude Haiku 4.5 |
| LMArena Text: Chinese | 1418 | 1422 | Solar Pro 4 |
| LMArena Text: German | 1374 | 1358 | Claude Haiku 4.5 |
| LMArena Text: Japanese | 1338 | 1320 | Claude Haiku 4.5 |
| LMArena Text: Korean | 1346 | 1383 | Solar Pro 4 |
| LMArena Text: French | 1411 | 1400 | Claude Haiku 4.5 |
| LMArena Text: Spanish | 1421 | 1409 | Claude Haiku 4.5 |
| LMArena Text: Russian | 1381 | 1357 | Claude Haiku 4.5 |
| LMArena Text: Polish | 1343 | 1304 | Claude Haiku 4.5 |
| LMArena Text: multi-turn | 1409 | 1385 | Claude Haiku 4.5 |
| LMArena Text: longer queries | 1427 | 1382 | Claude Haiku 4.5 |
| LMArena Text: writing and language | 1386 | 1344 | Claude Haiku 4.5 |
| LMArena Text: entertainment and media | 1369 | 1332 | Claude Haiku 4.5 |
| LMArena Document | 1420 | Not measured | Only Claude Haiku 4.5 measured |
| Neither model has a result on the other 19 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Claude Haiku 4.5 | 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 | Anthropic Claude Haiku 4.5 | Upstage Solar Pro 4 |
|---|---|---|
| Maker | Anthropic | Upstage |
| Weights | No public weights listed | No public weights listed |
| Released | October 15, 2025 | August 10, 2026 |
| Context window | 200K | 524K |
| Input $/Mtok | $1.00 | $0.15 |
| Output $/Mtok | $5.00 | $0.60 |
| Coding index | 49.8 | 24.4 |
| Independent measurements behind it | 3 | 1 |
| Cost per solved task | $0.56 | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Claude Haiku 4.5 better than Solar Pro 4 for coding?
Pick Claude Haiku 4.5 for coding: it scores 49.8 on the Vibe Coding Index against 24.4 for Solar Pro 4. Pick Solar Pro 4 when output tokens cost 8.3x less, or when the context window is larger, 524K against 200K tokens.
Which is cheaper, Claude Haiku 4.5 or Solar Pro 4?
Claude Haiku 4.5 costs $1.00 per million input tokens and $5.00 per million output tokens; Solar Pro 4 costs $0.15 and $0.60. Cost per solved task is known for Claude Haiku 4.5 only.
Which has the bigger context window, Claude Haiku 4.5 or Solar Pro 4?
Solar Pro 4, with 524K tokens against 200K.
How many benchmarks is the Claude Haiku 4.5 vs Solar Pro 4 comparison based on?
39 benchmarks have a result for both models as of October 21, 2026. Claude Haiku 4.5's coding index rests on 3 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.