Claude Sonnet 4.5 vs R1 0528
Updated October 21, 2026. 45 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.
Decision reading
Pick R1 0528 for coding: it scores 71.4 on the Vibe Coding Index against 59.1 for Claude Sonnet 4.5, though on 1 benchmark against 2.
Pick Claude Sonnet 4.5 when the context window is larger, 1M against 164K tokens, or when what matters is WeirdML or LMArena Text: coding, where it leads.
- Shared results
- 45
- Claude Sonnet 4.5 only
- 47
- R1 0528 only
- 14
- Like-for-like categories
- 8 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
R1 0528
R1 0528 scores 71.4 against 59.1.
2 and 1 benchmarks behind the scores
Intelligence
AA Intelligence Index
Claude Sonnet 4.5
Claude Sonnet 4.5 leads, 20.7 against 13.1.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Claude Sonnet 4.5 has a AA Agentic Index result, 15.8.
Directional only
Reasoning
GPQA Diamond
No call
Only Claude Sonnet 4.5 has a GPQA Diamond result, 81.6%.
Directional only
Math
AIME
No call
Only Claude Sonnet 4.5 has a AIME result, 88.2%.
Directional only
Knowledge
MMLU Pro
No call
Only Claude Sonnet 4.5 has a MMLU Pro result, 87.4%.
Directional only
Web design
Design Arena: websites
Claude Sonnet 4.5
Claude Sonnet 4.5 leads, 1190 against 1149.
Same board, both measured
Long documents
Listed context window
Claude Sonnet 4.5
Claude Sonnet 4.5 takes 1M tokens against 164K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
R1 0528
Claude Sonnet 4.5 $0.011, R1 0528 $0.0016 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Claude Sonnet 4.5 has the number, $1.16.
Directional only
At a glance
- Coding index
- Claude Sonnet 4.5 59.1 from 2 benchmarks, R1 0528 71.4 from 1 benchmark.
- Widest category
- Agentic work, 15.6 points apart on average over 2 shared benchmarks.
- Widest single gap
- ARC-AGI: Claude Sonnet 4.5 63.7% against R1 0528 21.2%, 42.5 points apart on a 0 to 100 scale.
- Output price
- Claude Sonnet 4.5 $15.00 against R1 0528 $2.15 per million output tokens, 7.0x apart.
- Context window
- Claude Sonnet 4.5 takes 1M tokens, R1 0528 164K.
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 Sonnet 4.5 | Bars | R1 0528 | Ties |
|---|---|---|---|---|
| Coding | 3 | 0 | ||
| Intelligence | 1 | 0 | ||
| Agentic work | 2 | 0 | ||
| Reasoning | 7 | 0 | ||
| Math | 4 | 0 | ||
| Knowledge | 3 | 1 | ||
| Web design | 6 | 1 | ||
| General | 15 | 2 | ||
| All shared boards | 41 | 4 |
CodingLike-for-likeFour of these boards feed the Vibe Coding Index30
| Benchmark | Claude Sonnet 4.5 | R1 0528 | Leader |
|---|---|---|---|
| Aider polyglot | Not measured | 71.4% | Only R1 0528 measured |
| SWE-bench Verified | 74.8% | Not measured | Only Claude Sonnet 4.5 measured |
| SWE-bench Multilingual | 67.0% | Not measured | Only Claude Sonnet 4.5 measured |
| LMArena WebDev | 1394 | Not measured | Only Claude Sonnet 4.5 measured |
| AA Coding Index | 52.1 | Not measured | Only Claude Sonnet 4.5 measured |
| LiveCodeBench (Vals AI) | 73.0% | Not measured | Only Claude Sonnet 4.5 measured |
| SWE-bench Verified (Vals AI) | 70.0% | Not measured | Only Claude Sonnet 4.5 measured |
| Vibe Code Bench (Vals AI) | 22.6% | Not measured | Only Claude Sonnet 4.5 measured |
| LiveCodeBench (Artificial Analysis run) | Not measured | 77.0% | Only R1 0528 measured |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 15.9% | Only R1 0528 measured |
| Terminal-Bench | 46.5% | Not measured | Only Claude Sonnet 4.5 measured |
| GSO-Bench | 14.7% | Not measured | Only Claude Sonnet 4.5 measured |
| WeirdML | 47.7% | 41.6% | Claude Sonnet 4.5 |
| Cybench | 60.0% | Not measured | Only Claude Sonnet 4.5 measured |
| ALE-Bench | Not measured | 804.1 | Only R1 0528 measured |
| LMArena Text: coding | 1488 | 1427 | Claude Sonnet 4.5 |
| LMArena Text: software and IT | 1473 | 1435 | Claude Sonnet 4.5 |
| LMArena WebDev: React | 1386 | Not measured | Only Claude Sonnet 4.5 measured |
| LMArena WebDev: HTML | 1399 | Not measured | Only Claude Sonnet 4.5 measured |
| Neither model has a result on the other 19 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Claude Sonnet 4.5 | R1 0528 | Leader |
|---|---|---|---|
| AA Intelligence Index | 20.7 | 13.1 | Claude Sonnet 4.5 |
| Epoch Capabilities Index | 146.7 | Not measured | Only Claude Sonnet 4.5 measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Claude Sonnet 4.5 | R1 0528 | Leader |
|---|---|---|---|
| AA Agentic Index | 15.8 | Not measured | Only Claude Sonnet 4.5 measured |
| Design Arena: agents building web apps | 1060 | Not measured | Only Claude Sonnet 4.5 measured |
| Design Arena: agents building full-stack apps | 1050 | Not measured | Only Claude Sonnet 4.5 measured |
| Design Arena: agents building mobile apps | 1137 | Not measured | Only Claude Sonnet 4.5 measured |
| τ²-Bench Telecom | Not measured | 36.5% | Only R1 0528 measured |
| METR time horizons | 67.4% | 53.8% | Claude Sonnet 4.5 |
| Remote Labor Index | 2.1% | Not measured | Only Claude Sonnet 4.5 measured |
| GDPval | 42.5% | Not measured | Only Claude Sonnet 4.5 measured |
| DeepResearch Bench | 52.6% | 35.1% | Claude Sonnet 4.5 |
| OSWorld | 62.9% | Not measured | Only Claude Sonnet 4.5 measured |
| Vending-Bench 2 | $3,839 | Not measured | Only Claude Sonnet 4.5 measured |
| Neither model has a result on the other 28 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index70
| Benchmark | Claude Sonnet 4.5 | R1 0528 | Leader |
|---|---|---|---|
| GPQA Diamond | 81.6% | Not measured | Only Claude Sonnet 4.5 measured |
| MMMU Pro (Vals AI) | 79.3% | Not measured | Only Claude Sonnet 4.5 measured |
| GPQA Diamond (Artificial Analysis run) | Not measured | 81.3% | Only R1 0528 measured |
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 15.8% | Only R1 0528 measured |
| GPQA Diamond (Epoch AI run) | 82.3% | 76.3% | Claude Sonnet 4.5 |
| ARC-AGI | 63.7% | 21.2% | Claude Sonnet 4.5 |
| ARC-AGI-2 | 13.6% | 1.1% | Claude Sonnet 4.5 |
| SimpleBench | 54.3% | 40.8% | Claude Sonnet 4.5 |
| Chess puzzles | 10.0% | Not measured | Only Claude Sonnet 4.5 measured |
| Mystery game puzzles | 17.0% | Not measured | Only Claude Sonnet 4.5 measured |
| EBR-bench | 2.4% | Not measured | Only Claude Sonnet 4.5 measured |
| VPCT | 39.8% | Not measured | Only Claude Sonnet 4.5 measured |
| LMArena Text: hard prompts | 1462 | 1415 | Claude Sonnet 4.5 |
| LMArena Text: expert | 1483 | 1394 | Claude Sonnet 4.5 |
| LMArena Text: hard prompts in English | 1471 | 1422 | Claude Sonnet 4.5 |
| Neither model has a result on the other 6 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index40
| Benchmark | Claude Sonnet 4.5 | R1 0528 | Leader |
|---|---|---|---|
| AIME | 88.2% | Not measured | Only Claude Sonnet 4.5 measured |
| MGSM (Vals AI) | 94.3% | Not measured | Only Claude Sonnet 4.5 measured |
| AA Math Index | Not measured | 76.0 | Only R1 0528 measured |
| AIME 2025 (Artificial Analysis run) | Not measured | 76.0% | Only R1 0528 measured |
| OTIS Mock AIME | 77.8% | 66.4% | Claude Sonnet 4.5 |
| FrontierMath, tiers 1 to 3 | 23.9% | Not measured | Only Claude Sonnet 4.5 measured |
| FrontierMath, tier 4 | 2.4% | Not measured | Only Claude Sonnet 4.5 measured |
| ProofBench | 19.0% | Not measured | Only Claude Sonnet 4.5 measured |
| MATH level 5 | 97.7% | 96.6% | Claude Sonnet 4.5 |
| LMArena Text: math | 1449 | 1400 | Claude Sonnet 4.5 |
| LMArena Text: mathematical work | 1462 | 1415 | Claude Sonnet 4.5 |
| Neither model has a result on the other 2 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index31
| Benchmark | Claude Sonnet 4.5 | R1 0528 | Leader |
|---|---|---|---|
| MMLU Pro | 87.4% | Not measured | Only Claude Sonnet 4.5 measured |
| LegalBench (Vals AI) | 84.1% | Not measured | Only Claude Sonnet 4.5 measured |
| CaseLaw (Vals AI) | 62.2% | Not measured | Only Claude Sonnet 4.5 measured |
| CorpFin (Vals AI) | 62.0% | Not measured | Only Claude Sonnet 4.5 measured |
| TaxEval (Vals AI) | 73.3% | Not measured | Only Claude Sonnet 4.5 measured |
| MortgageTax (Vals AI) | 64.0% | Not measured | Only Claude Sonnet 4.5 measured |
| MedQA (Vals AI) | 94.7% | Not measured | Only Claude Sonnet 4.5 measured |
| MedCode (Vals AI) | 44.1% | Not measured | Only Claude Sonnet 4.5 measured |
| MMLU Pro (Artificial Analysis run) | Not measured | 84.9% | Only R1 0528 measured |
| SimpleQA Verified | 30.7% | Not measured | Only Claude Sonnet 4.5 measured |
| LMArena Text: science | 1448 | 1430 | Claude Sonnet 4.5 |
| LMArena Text: medicine and healthcare | 1444 | 1445 | R1 0528 |
| LMArena Text: legal and government | 1451 | 1419 | Claude Sonnet 4.5 |
| LMArena Text: business and finance | 1440 | 1402 | Claude Sonnet 4.5 |
| Neither model has a result on the other 3 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index61
| Benchmark | Claude Sonnet 4.5 | R1 0528 | Leader |
|---|---|---|---|
| Design Arena: websites | 1190 | 1149 | Claude Sonnet 4.5 |
| Design Arena: UI components | 1173 | 1102 | Claude Sonnet 4.5 |
| Design Arena: game dev | 1166 | 1098 | Claude Sonnet 4.5 |
| Design Arena: data viz | 1167 | 1182 | R1 0528 |
| Design Arena: 3D | 1158 | 1111 | Claude Sonnet 4.5 |
| Design Arena: all code categories | 1183 | 1139 | Claude Sonnet 4.5 |
| Design Arena: SVG | 1114 | 1038 | Claude Sonnet 4.5 |
| Design Arena: ASCII art | 1204 | Not measured | Only Claude Sonnet 4.5 measured |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index152
| Benchmark | Claude Sonnet 4.5 | R1 0528 | Leader |
|---|---|---|---|
| SAGE (Vals AI) | 36.1% | Not measured | Only Claude Sonnet 4.5 measured |
| MedScribe (Vals AI) | 84.5% | Not measured | Only Claude Sonnet 4.5 measured |
| IFBench | Not measured | 39.6% | Only R1 0528 measured |
| Long context reasoning (AA-LCR) | Not measured | 55.7% | Only R1 0528 measured |
| DTBench | 83.2% | Not measured | Only Claude Sonnet 4.5 measured |
| LMCA | 38.8% | Not measured | Only Claude Sonnet 4.5 measured |
| Fiction.LiveBench | Not measured | 75.0% | Only R1 0528 measured |
| Creative writing (Lech Mazur) | Not measured | 81.9% | Only R1 0528 measured |
| LMArena Text | 1438 | 1428 | Claude Sonnet 4.5 |
| LMArena Text: instruction following | 1459 | 1382 | Claude Sonnet 4.5 |
| LMArena Text: creative writing | 1442 | 1405 | Claude Sonnet 4.5 |
| LMArena Text: English | 1450 | 1437 | Claude Sonnet 4.5 |
| LMArena Text: non-English | 1425 | 1412 | Claude Sonnet 4.5 |
| LMArena Text: Chinese | 1460 | 1442 | Claude Sonnet 4.5 |
| LMArena Text: German | 1427 | 1404 | Claude Sonnet 4.5 |
| LMArena Text: Japanese | 1390 | 1391 | R1 0528 |
| LMArena Text: Korean | 1402 | 1360 | Claude Sonnet 4.5 |
| LMArena Text: French | 1459 | 1417 | Claude Sonnet 4.5 |
| LMArena Text: Spanish | 1458 | 1411 | Claude Sonnet 4.5 |
| LMArena Text: Russian | 1437 | 1423 | Claude Sonnet 4.5 |
| LMArena Text: Polish | 1423 | 1428 | R1 0528 |
| LMArena Text: multi-turn | 1465 | 1405 | Claude Sonnet 4.5 |
| LMArena Text: longer queries | 1475 | 1391 | Claude Sonnet 4.5 |
| LMArena Text: writing and language | 1442 | 1402 | Claude Sonnet 4.5 |
| LMArena Text: entertainment and media | 1428 | 1400 | Claude Sonnet 4.5 |
| LMArena Document | 1450 | Not measured | Only Claude Sonnet 4.5 measured |
| Neither model has a result on the other 20 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Claude Sonnet 4.5 | R1 0528 | 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
R1 0528 costs less
Repository review
50K input + 3K output tokens
R1 0528 costs less
Agent loop
200K input + 10K output tokens
R1 0528 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 Sonnet 4.5 | DeepSeek R1 0528 |
|---|---|---|
| Maker | Anthropic | DeepSeek |
| Weights | No public weights listed | Open weights |
| Released | September 29, 2025 | May 28, 2025 |
| Context window | 1M | 164K |
| Input $/Mtok | $3.00 | $0.50 |
| Output $/Mtok | $15.00 | $2.15 |
| Coding index | 59.1 | 71.4 |
| Independent measurements behind it | 2 | 1 |
| Cost per solved task | $1.16 | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Claude Sonnet 4.5 better than R1 0528 for coding?
Pick R1 0528 for coding: it scores 71.4 on the Vibe Coding Index against 59.1 for Claude Sonnet 4.5, though on 1 benchmark against 2. Pick Claude Sonnet 4.5 when the context window is larger, 1M against 164K tokens, or when what matters is WeirdML or LMArena Text: coding, where it leads.
Which is cheaper, Claude Sonnet 4.5 or R1 0528?
Claude Sonnet 4.5 costs $3.00 per million input tokens and $15.00 per million output tokens; R1 0528 costs $0.50 and $2.15. Cost per solved task is known for Claude Sonnet 4.5 only.
Which has the bigger context window, Claude Sonnet 4.5 or R1 0528?
Claude Sonnet 4.5, with 1M tokens against 164K.
How many benchmarks is the Claude Sonnet 4.5 vs R1 0528 comparison based on?
45 benchmarks have a result for both models as of October 21, 2026. Claude Sonnet 4.5's coding index rests on 2 independent benchmarks and R1 0528's on 1. Where only one model has a result, the page says so instead of naming a winner.