Claude Opus 4.1 vs Claude Opus 5.5
Updated October 21, 2026. 47 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.
vs boards won of 47 shared
Decision reading
Pick Claude Opus 5.5 for coding: it scores 92.2 on the Vibe Coding Index against 27.2 for Claude Opus 4.1.
Claude Opus 4.1 is neither cheaper nor larger in context, and leads no benchmark both models were measured on.
Model AClaude Opus 4.1Anthropic27.2/1001 independent benchmarkNo cost per solved taskModel BClaude Opus 5.5Anthropic92.2/1002 independent benchmarksNo cost per solved task
- Shared results
- 47
- Claude Opus 4.1 only
- 24
- Claude Opus 5.5 only
- 60
- 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 Opus 5.5
Claude Opus 5.5 scores 92.2 against 27.2.
1 and 2 benchmarks behind the scores
Intelligence
AA Intelligence Index
Claude Opus 5.5
Claude Opus 5.5 leads, 57.6 against 22.8.
Same board, both measured
Reasoning
GPQA Diamond
No call
Only Claude Opus 4.1 has a GPQA Diamond result, 76.3%.
Directional only
Math
AIME
No call
Only Claude Opus 4.1 has a AIME result, 78.2%.
Directional only
Knowledge
MMLU Pro
No call
Only Claude Opus 4.1 has a MMLU Pro result, 87.9%.
Directional only
Web design
Design Arena: websites
Claude Opus 5.5
Claude Opus 5.5 leads, 1335 against 1177.
Same board, both measured
General
Vals Index
No call
Only Claude Opus 5.5 has a Vals Index result, 70.2%.
Directional only
Long documents
Listed context window
Claude Opus 5.5
Claude Opus 5.5 takes 1M tokens against 200K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Claude Opus 5.5
Claude Opus 4.1 $0.052, Claude Opus 5.5 $0.014 per turn.
List prices
At a glance
- Coding index
- Claude Opus 4.1 27.2 from 1 benchmark, Claude Opus 5.5 92.2 from 2 benchmarks.
- Widest category
- Math, 46.1 points apart on average over 5 shared benchmarks.
- Widest single gap
- FrontierMath, tier 4: Claude Opus 4.1 2.4% against Claude Opus 5.5 95.0%, 92.6 points apart on a 0 to 100 scale.
- Output price
- Claude Opus 4.1 $75.00 against Claude Opus 5.5 $20.00 per million output tokens, 3.8x apart.
- Context window
- Claude Opus 4.1 takes 200K tokens, Claude Opus 5.5 1M.
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 Opus 4.1 | Bars | Claude Opus 5.5 | Ties |
|---|---|---|---|---|
| Coding | 0 | 4 | ||
| Intelligence | 0 | 2 | ||
| Reasoning | 0 | 6 | ||
| Math | 0 | 5 | ||
| Knowledge | 0 | 5 | ||
| Web design | 0 | 7 | ||
| General | 0 | 18 | ||
| All shared boards | 0 | 47 |
CodingLike-for-likeFour of these boards feed the Vibe Coding Index04
| Benchmark | Claude Opus 4.1 | Claude Opus 5.5 | Leader |
|---|---|---|---|
| LiveBench coding | Not measured | 96.3% | Only Claude Opus 5.5 measured |
| LMArena WebDev | 1390 | 1807 | Claude Opus 5.5 |
| LiveCodeBench (Vals AI) | 66.5% | Not measured | Only Claude Opus 4.1 measured |
| Terminal-Bench 4 (Vals AI) | Not measured | 65.2% | Only Claude Opus 5.5 measured |
| Vibe Code Bench (Vals AI) | Not measured | 90.3% | Only Claude Opus 5.5 measured |
| Code migration (Vals AI) | Not measured | 66.7% | Only Claude Opus 5.5 measured |
| ProgramBench (Vals AI) | Not measured | 18.5% | Only Claude Opus 5.5 measured |
| IOI (Vals AI) | Not measured | 95.1% | Only Claude Opus 5.5 measured |
| Terminal-Bench 2.1 (Vals AI) | Not measured | 87.6% | Only Claude Opus 5.5 measured |
| SWE-bench Multimodal (Vals AI) | Not measured | 70.2% | Only Claude Opus 5.5 measured |
| Vibe Code Bench 1-100 (Vals AI) | Not measured | 30.4% | Only Claude Opus 5.5 measured |
| CyberBench (Vals AI) | Not measured | 74.6% | Only Claude Opus 5.5 measured |
| SciCode | Not measured | 66.9% | Only Claude Opus 5.5 measured |
| Terminal-Bench | 38.0% | Not measured | Only Claude Opus 4.1 measured |
| FrontierCode | Not measured | 54.6% | Only Claude Opus 5.5 measured |
| FrontierSWE | Not measured | 62.3% | Only Claude Opus 5.5 measured |
| WeirdML | 45.9% | Not measured | Only Claude Opus 4.1 measured |
| MirrorCode | Not measured | 77.4% | Only Claude Opus 5.5 measured |
| Cybench | 42.0% | Not measured | Only Claude Opus 4.1 measured |
| ALE-Bench | Not measured | 2147.4 | Only Claude Opus 5.5 measured |
| LMArena Text: coding | 1479 | 1545 | Claude Opus 5.5 |
| LMArena Text: software and IT | 1456 | 1538 | Claude Opus 5.5 |
| LMArena WebDev: React | Not measured | 1855 | Only Claude Opus 5.5 measured |
| LMArena WebDev: HTML | 1399 | 1753 | Claude Opus 5.5 |
| LMArena WebDev: from an image | Not measured | 1753 | Only Claude Opus 5.5 measured |
| Neither model has a result on the other 13 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
| Benchmark | Claude Opus 4.1 | Claude Opus 5.5 | Leader |
|---|---|---|---|
| AA Intelligence Index | 22.8 | 57.6 | Claude Opus 5.5 |
| Epoch Capabilities Index | 144.1 | 168.8 | Claude Opus 5.5 |
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index26 boards, none shared
| Benchmark | Claude Opus 4.1 | Claude Opus 5.5 | Leader |
|---|---|---|---|
| Design Arena: agents building web apps | Not measured | 1316 | Only Claude Opus 5.5 measured |
| Design Arena: agents building mobile apps | Not measured | 1311 | Only Claude Opus 5.5 measured |
| Design Arena: spreadsheets | Not measured | 1359 | Only Claude Opus 5.5 measured |
| LiveBench research | Not measured | 85.0% | Only Claude Opus 5.5 measured |
| LiveBench browser | Not measured | 80.0% | Only Claude Opus 5.5 measured |
| LiveBench long agentic | Not measured | 85.0% | Only Claude Opus 5.5 measured |
| SREBench (Vals AI) | Not measured | 33.6% | Only Claude Opus 5.5 measured |
| Finance Agent (Vals AI) | Not measured | 58.6% | Only Claude Opus 5.5 measured |
| Tax Agent Bench (Vals AI) | Not measured | 45.6% | Only Claude Opus 5.5 measured |
| Legal Research Bench (Vals AI) | Not measured | 50.5% | Only Claude Opus 5.5 measured |
| Harvey's Legal Agent Benchmark (Vals AI) | Not measured | 9.2% | Only Claude Opus 5.5 measured |
| Excel Modeling Benchmark (Vals AI) | Not measured | 75.9% | Only Claude Opus 5.5 measured |
| BioMysteryBench (Vals AI) | Not measured | 79.3% | Only Claude Opus 5.5 measured |
| Terminal-Bench-Science (Vals AI) | Not measured | 47.1% | Only Claude Opus 5.5 measured |
| Vals Science Index | Not measured | 58.7% | Only Claude Opus 5.5 measured |
| Time Horizon Index (Vals AI) | Not measured | 91.3% | Only Claude Opus 5.5 measured |
| CUA-bench (Vals AI) | Not measured | 14.0% | Only Claude Opus 5.5 measured |
| Robo-bench (Vals AI) | Not measured | 14.6% | Only Claude Opus 5.5 measured |
| APEX-Agents | Not measured | 73.5% | Only Claude Opus 5.5 measured |
| METR time horizons | 66.8% | Not measured | Only Claude Opus 4.1 measured |
| Remote Labor Index | Not measured | 21.3% | Only Claude Opus 5.5 measured |
| GDPval | 43.6% | Not measured | Only Claude Opus 4.1 measured |
| DeepResearch Bench | 48.3% | Not measured | Only Claude Opus 4.1 measured |
| SpireClimb | Not measured | 3.3% | Only Claude Opus 5.5 measured |
| Vending-Bench 2 | Not measured | $9,235 | Only Claude Opus 5.5 measured |
| LMArena Search | Not measured | 1213 | Only Claude Opus 5.5 measured |
| Neither model has a result on the other 13 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index06
| Benchmark | Claude Opus 4.1 | Claude Opus 5.5 | Leader |
|---|---|---|---|
| GPQA Diamond | 76.3% | Not measured | Only Claude Opus 4.1 measured |
| LiveBench reasoning | Not measured | 92.2% | Only Claude Opus 5.5 measured |
| MysteryMechanism (Vals AI) | Not measured | 49.5% | Only Claude Opus 5.5 measured |
| MMMU Pro (Vals AI) | 77.5% | Not measured | Only Claude Opus 4.1 measured |
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 61.4% | Only Claude Opus 5.5 measured |
| GPQA Diamond (Epoch AI run) | 77.3% | 90.6% | Claude Opus 5.5 |
| ARC-AGI | Not measured | 98.5% | Only Claude Opus 5.5 measured |
| ARC-AGI-2 | Not measured | 93.3% | Only Claude Opus 5.5 measured |
| SimpleBench | 60.0% | Not measured | Only Claude Opus 4.1 measured |
| Chess puzzles | Not measured | 67.0% | Only Claude Opus 5.5 measured |
| Mystery game puzzles | 21.0% | 71.0% | Claude Opus 5.5 |
| EBR-bench | 7.9% | 71.4% | Claude Opus 5.5 |
| VPCT | 35.0% | Not measured | Only Claude Opus 4.1 measured |
| LMArena Text: hard prompts | 1442 | 1536 | Claude Opus 5.5 |
| LMArena Text: expert | 1438 | 1549 | Claude Opus 5.5 |
| LMArena Text: hard prompts in English | 1451 | 1535 | Claude Opus 5.5 |
| LMArena Vision: diagrams | Not measured | 1345 | Only Claude Opus 5.5 measured |
| LMArena Vision: homework | Not measured | 1362 | Only Claude Opus 5.5 measured |
| Neither model has a result on the other 3 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index05
| Benchmark | Claude Opus 4.1 | Claude Opus 5.5 | Leader |
|---|---|---|---|
| AIME | 78.2% | Not measured | Only Claude Opus 4.1 measured |
| MATH 500 (Vals AI) | 95.4% | Not measured | Only Claude Opus 4.1 measured |
| MGSM (Vals AI) | 94.4% | Not measured | Only Claude Opus 4.1 measured |
| OTIS Mock AIME | 68.9% | 100.0% | Claude Opus 5.5 |
| FrontierMath, tiers 1 to 3 | 12.6% | 91.2% | Claude Opus 5.5 |
| FrontierMath, tier 4 | 2.4% | 95.0% | Claude Opus 5.5 |
| ProofBench | Not measured | 100.0% | Only Claude Opus 5.5 measured |
| LMArena Text: math | 1431 | 1518 | Claude Opus 5.5 |
| LMArena Text: mathematical work | 1434 | 1516 | Claude Opus 5.5 |
| Neither model has a result on the other 4 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index05
| Benchmark | Claude Opus 4.1 | Claude Opus 5.5 | Leader |
|---|---|---|---|
| MMLU Pro | 87.9% | Not measured | Only Claude Opus 4.1 measured |
| LegalBench (Vals AI) | 83.5% | Not measured | Only Claude Opus 4.1 measured |
| TaxEval (Vals AI) | 73.7% | Not measured | Only Claude Opus 4.1 measured |
| MortgageTax (Vals AI) | 61.1% | Not measured | Only Claude Opus 4.1 measured |
| MedQA (Vals AI) | 93.6% | Not measured | Only Claude Opus 4.1 measured |
| MedCode (Vals AI) | 47.2% | 49.8% | Claude Opus 5.5 |
| SimpleQA Verified | Not measured | 72.2% | Only Claude Opus 5.5 measured |
| LMArena Text: science | 1422 | 1524 | Claude Opus 5.5 |
| LMArena Text: medicine and healthcare | 1416 | 1509 | Claude Opus 5.5 |
| LMArena Text: legal and government | 1421 | 1518 | Claude Opus 5.5 |
| LMArena Text: business and finance | 1406 | 1494 | Claude Opus 5.5 |
| Neither model has a result on the other 6 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index07
| Benchmark | Claude Opus 4.1 | Claude Opus 5.5 | Leader |
|---|---|---|---|
| Design Arena: websites | 1177 | 1335 | Claude Opus 5.5 |
| Design Arena: UI components | 1164 | 1390 | Claude Opus 5.5 |
| Design Arena: game dev | 1172 | 1457 | Claude Opus 5.5 |
| Design Arena: data viz | 1166 | 1397 | Claude Opus 5.5 |
| Design Arena: 3D | 1153 | 1477 | Claude Opus 5.5 |
| Design Arena: all code categories | 1171 | 1390 | Claude Opus 5.5 |
| Design Arena: SVG | 1152 | 1332 | Claude Opus 5.5 |
| Design Arena: ASCII art | 1167 | Not measured | Only Claude Opus 4.1 measured |
| LiveBench design | Not measured | 86.9% | Only Claude Opus 5.5 measured |
GeneralLike-for-likePublic boards, shown as published, kept out of the index018
| Benchmark | Claude Opus 4.1 | Claude Opus 5.5 | Leader |
|---|---|---|---|
| Vals Index | Not measured | 70.2% | Only Claude Opus 5.5 measured |
| LiveBench data analysis | Not measured | 80.3% | Only Claude Opus 5.5 measured |
| Public Benefits Bench (Vals AI) | Not measured | 70.6% | Only Claude Opus 5.5 measured |
| SAGE (Vals AI) | 31.4% | 45.8% | Claude Opus 5.5 |
| MedScribe (Vals AI) | 73.9% | 91.4% | Claude Opus 5.5 |
| Long context reasoning (AA-LCR) | Not measured | 84.7% | Only Claude Opus 5.5 measured |
| DTBench | 80.0% | 98.9% | Claude Opus 5.5 |
| LMCA | 37.1% | 68.2% | Claude Opus 5.5 |
| Creative writing (Lech Mazur) | 84.7% | Not measured | Only Claude Opus 4.1 measured |
| Furniture assembly | Not measured | 83.3% | Only Claude Opus 5.5 measured |
| LMArena Text | 1419 | 1516 | Claude Opus 5.5 |
| LMArena Text: instruction following | 1435 | 1537 | Claude Opus 5.5 |
| LMArena Text: creative writing | 1412 | 1535 | Claude Opus 5.5 |
| LMArena Vision | Not measured | 1321 | Only Claude Opus 5.5 measured |
| LMArena Text: English | 1433 | 1519 | Claude Opus 5.5 |
| LMArena Text: non-English | 1405 | 1507 | Claude Opus 5.5 |
| LMArena Text: Chinese | 1427 | 1582 | Claude Opus 5.5 |
| LMArena Text: German | 1413 | Not measured | Only Claude Opus 4.1 measured |
| LMArena Text: Japanese | 1377 | 1534 | Claude Opus 5.5 |
| LMArena Text: Korean | 1381 | Not measured | Only Claude Opus 4.1 measured |
| LMArena Text: French | 1433 | 1493 | Claude Opus 5.5 |
| LMArena Text: Spanish | 1448 | 1508 | Claude Opus 5.5 |
| LMArena Text: Russian | 1422 | 1517 | Claude Opus 5.5 |
| LMArena Text: Polish | 1413 | Not measured | Only Claude Opus 4.1 measured |
| LMArena Text: multi-turn | 1444 | 1501 | Claude Opus 5.5 |
| LMArena Text: longer queries | 1455 | 1532 | Claude Opus 5.5 |
| LMArena Text: writing and language | 1418 | 1532 | Claude Opus 5.5 |
| LMArena Text: entertainment and media | 1398 | 1515 | Claude Opus 5.5 |
| LMArena Vision: English | Not measured | 1317 | Only Claude Opus 5.5 measured |
| LMArena Vision: reading text | Not measured | 1326 | Only Claude Opus 5.5 measured |
| LMArena Vision: creative writing | Not measured | 1320 | Only Claude Opus 5.5 measured |
| Neither model has a result on the other 15 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Claude Opus 4.1 | Claude Opus 5.5 | 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
Claude Opus 4.1$0.052Fits in one request
Claude Opus 5.5$0.014Fits in one request
Claude Opus 5.5 costs less
Repository review
50K input + 3K output tokens
Claude Opus 4.1$0.975Fits in one request
Claude Opus 5.5$0.260Fits in one request
Claude Opus 5.5 costs less
Agent loop
200K input + 10K output tokens
Claude Opus 4.1$3.75Exceeds the context window
Claude Opus 5.5$1.00Fits in one request
Claude Opus 5.5 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 Opus 4.1 | Anthropic Claude Opus 5.5 |
|---|---|---|
| Maker | Anthropic | Anthropic |
| Weights | No public weights listed | No public weights listed |
| Released | August 5, 2025 | September 22, 2026 |
| Context window | 200K | 1M |
| Input $/Mtok | $15.00 | $4.00 |
| Output $/Mtok | $75.00 | $20.00 |
| Coding index | 27.2 | 92.2 |
| Independent measurements behind it | 1 | 2 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Claude Opus 4.1 better than Claude Opus 5.5 for coding?
Pick Claude Opus 5.5 for coding: it scores 92.2 on the Vibe Coding Index against 27.2 for Claude Opus 4.1. Claude Opus 4.1 is neither cheaper nor larger in context, and leads no benchmark both models were measured on.
Which is cheaper, Claude Opus 4.1 or Claude Opus 5.5?
Claude Opus 4.1 costs $15.00 per million input tokens and $75.00 per million output tokens; Claude Opus 5.5 costs $4.00 and $20.00. Cost per solved task is known for neither of them.
Which has the bigger context window, Claude Opus 4.1 or Claude Opus 5.5?
Claude Opus 5.5, with 1M tokens against 200K.
How many benchmarks is the Claude Opus 4.1 vs Claude Opus 5.5 comparison based on?
47 benchmarks have a result for both models as of October 21, 2026. Claude Opus 4.1's coding index rests on 1 independent benchmark and Claude Opus 5.5's on 2. Where only one model has a result, the page says so instead of naming a winner.