Claude Opus 5 vs GPT-4.1 Nano
Updated October 21, 2026. 55 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 55 shared
Decision reading
Pick Claude Opus 5 for coding: it scores 81.8 on the Vibe Coding Index against 8.9 for GPT-4.1 Nano.
Pick GPT-4.1 Nano when output tokens cost 62.5x less, or when the context window is larger, 1.05M against 1M tokens.
Model AClaude Opus 5Anthropic81.8/1002 independent benchmarks$1.33 per solved taskModel BGPT-4.1 NanoOpenAI8.9/1001 independent benchmarkNo cost per solved task
- Shared results
- 55
- Claude Opus 5 only
- 75
- GPT-4.1 Nano only
- 14
- 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
Claude Opus 5 scores 81.8 against 8.9.
2 and 1 benchmarks behind the scores
Intelligence
AA Intelligence Index
Claude Opus 5
Claude Opus 5 leads, 50.8 against 7.8.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Claude Opus 5 has a AA Agentic Index result, 56.5.
Directional only
Reasoning
GPQA Diamond
Claude Opus 5
Claude Opus 5 leads, 93.4% against 50.8%.
Same board, both measured
Math
AIME
No call
Only GPT-4.1 Nano has a AIME result, 26.5%.
Directional only
Knowledge
MMLU Pro
Claude Opus 5
Claude Opus 5 leads, 91.6% against 63.5%.
Same board, both measured
Web design
Design Arena: websites
Claude Opus 5
Claude Opus 5 leads, 1309 against 973.
Same board, both measured
Long documents
Listed context window
GPT-4.1 Nano
GPT-4.1 Nano takes 1.05M tokens against 1M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
GPT-4.1 Nano
Claude Opus 5 $0.018, GPT-4.1 Nano $0.0003 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Claude Opus 5 has the number, $1.33.
Directional only
At a glance
- Coding index
- Claude Opus 5 81.8 from 2 benchmarks, GPT-4.1 Nano 8.9 from 1 benchmark.
- Widest category
- Math, 52.7 points apart on average over 3 shared benchmarks.
- Widest single gap
- ARC-AGI: Claude Opus 5 97.5% against GPT-4.1 Nano 0.0%, 97.5 points apart on a 0 to 100 scale.
- Output price
- Claude Opus 5 $25.00 against GPT-4.1 Nano $0.40 per million output tokens, 62.5x apart.
- Context window
- Claude Opus 5 takes 1M tokens, GPT-4.1 Nano 1.05M.
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 5 | Bars | GPT-4.1 Nano | Ties |
|---|---|---|---|---|
| Coding | 5 | 0 | ||
| Intelligence | 2 | 0 | ||
| Reasoning | 11 | 0 | ||
| Math | 3 | 0 | ||
| Knowledge | 10 | 0 | ||
| Web design | 6 | 0 | ||
| General | 18 | 0 | ||
| All shared boards | 55 | 0 |
CodingLike-for-likeFour of these boards feed the Vibe Coding Index50
| Benchmark | Claude Opus 5 | GPT-4.1 Nano | Leader |
|---|---|---|---|
| Aider polyglot | Not measured | 8.9% | Only GPT-4.1 Nano measured |
| LiveBench coding | 90.8% | Not measured | Only Claude Opus 5 measured |
| LMArena WebDev | 1689 | Not measured | Only Claude Opus 5 measured |
| AA Coding Index | 78.0 | 11.1 | Claude Opus 5 |
| LiveCodeBench (Vals AI) | 89.0% | 42.7% | Claude Opus 5 |
| SWE-bench Verified (Vals AI) | 97.0% | Not measured | Only Claude Opus 5 measured |
| Terminal-Bench 4 (Vals AI) | 53.5% | Not measured | Only Claude Opus 5 measured |
| Vibe Code Bench (Vals AI) | 88.4% | Not measured | Only Claude Opus 5 measured |
| Code migration (Vals AI) | 57.5% | Not measured | Only Claude Opus 5 measured |
| ProgramBench (Vals AI) | 3.0% | Not measured | Only Claude Opus 5 measured |
| IOI (Vals AI) | 84.3% | Not measured | Only Claude Opus 5 measured |
| Terminal-Bench 2.1 (Vals AI) | 84.6% | Not measured | Only Claude Opus 5 measured |
| Vibe Code Bench 1-100 (Vals AI) | 28.5% | Not measured | Only Claude Opus 5 measured |
| SkillsBench (Vals AI) | 60.4% | Not measured | Only Claude Opus 5 measured |
| CyberBench (Vals AI) | 65.4% | Not measured | Only Claude Opus 5 measured |
| LiveCodeBench (Artificial Analysis run) | Not measured | 32.6% | Only GPT-4.1 Nano measured |
| SciCode | 56.4% | Not measured | Only Claude Opus 5 measured |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 3.8% | Only GPT-4.1 Nano measured |
| FrontierCode | 53.4% | Not measured | Only Claude Opus 5 measured |
| FrontierSWE | 52.0% | Not measured | Only Claude Opus 5 measured |
| WeirdML | 91.8% | 19.0% | Claude Opus 5 |
| ALE-Bench | 2164.6 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: coding | 1533 | 1306 | Claude Opus 5 |
| LMArena Text: software and IT | 1527 | 1305 | Claude Opus 5 |
| LMArena WebDev: React | 1711 | Not measured | Only Claude Opus 5 measured |
| LMArena WebDev: HTML | 1680 | Not measured | Only Claude Opus 5 measured |
| LMArena WebDev: from an image | 1662 | Not measured | Only Claude Opus 5 measured |
| Neither model has a result on the other 11 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Claude Opus 5 | GPT-4.1 Nano | Leader |
|---|---|---|---|
| AA Intelligence Index | 50.8 | 7.8 | Claude Opus 5 |
| Epoch Capabilities Index | 163.9 | 129.5 | Claude Opus 5 |
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index28 boards, none shared
| Benchmark | Claude Opus 5 | GPT-4.1 Nano | Leader |
|---|---|---|---|
| AA Agentic Index | 56.5 | Not measured | Only Claude Opus 5 measured |
| Design Arena: agents building web apps | 1266 | Not measured | Only Claude Opus 5 measured |
| Design Arena: agents building full-stack apps | 1306 | Not measured | Only Claude Opus 5 measured |
| Design Arena: agents building mobile apps | 1348 | Not measured | Only Claude Opus 5 measured |
| Design Arena: agents building Android apps | 1258 | Not measured | Only Claude Opus 5 measured |
| Design Arena: agents building Godot games | 1279 | Not measured | Only Claude Opus 5 measured |
| Design Arena: agents building games | 1261 | Not measured | Only Claude Opus 5 measured |
| Design Arena: PowerPoint slides | 1265 | Not measured | Only Claude Opus 5 measured |
| LiveBench research | 88.9% | Not measured | Only Claude Opus 5 measured |
| LiveBench browser | 84.0% | Not measured | Only Claude Opus 5 measured |
| LiveBench long agentic | 62.1% | Not measured | Only Claude Opus 5 measured |
| SREBench (Vals AI) | 12.2% | Not measured | Only Claude Opus 5 measured |
| Finance Agent (Vals AI) | 58.6% | Not measured | Only Claude Opus 5 measured |
| Tax Agent Bench (Vals AI) | 45.5% | Not measured | Only Claude Opus 5 measured |
| Legal Research Bench (Vals AI) | 55.3% | Not measured | Only Claude Opus 5 measured |
| Excel Modeling Benchmark (Vals AI) | 73.6% | Not measured | Only Claude Opus 5 measured |
| BioMysteryBench (Vals AI) | 79.3% | Not measured | Only Claude Opus 5 measured |
| Terminal-Bench-Science (Vals AI) | 27.1% | Not measured | Only Claude Opus 5 measured |
| Vals Science Index | 47.9% | Not measured | Only Claude Opus 5 measured |
| Time Horizon Index (Vals AI) | 18.8% | Not measured | Only Claude Opus 5 measured |
| CUA-bench (Vals AI) | 9.0% | Not measured | Only Claude Opus 5 measured |
| τ²-Bench Telecom | Not measured | 17.3% | Only GPT-4.1 Nano measured |
| APEX-Agents | 65.8% | Not measured | Only Claude Opus 5 measured |
| OSWorld 2.0 | 31.4% | Not measured | Only Claude Opus 5 measured |
| BALROG | 63.4% | Not measured | Only Claude Opus 5 measured |
| PostTrainBench | 35.0% | Not measured | Only Claude Opus 5 measured |
| Vending-Bench 2 | $11,182 | Not measured | Only Claude Opus 5 measured |
| LMArena Search | 1242 | Not measured | Only Claude Opus 5 measured |
| Neither model has a result on the other 11 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index110
| Benchmark | Claude Opus 5 | GPT-4.1 Nano | Leader |
|---|---|---|---|
| GPQA Diamond | 93.4% | 50.8% | Claude Opus 5 |
| LiveBench reasoning | 91.2% | Not measured | Only Claude Opus 5 measured |
| MysteryMechanism (Vals AI) | 37.4% | Not measured | Only Claude Opus 5 measured |
| MMMU Pro (Vals AI) | 89.9% | 55.0% | Claude Opus 5 |
| GPQA Diamond (Artificial Analysis run) | 93.7% | 51.2% | Claude Opus 5 |
| Humanity's Last Exam (Artificial Analysis run) | 54.9% | 3.8% | Claude Opus 5 |
| GPQA Diamond (Epoch AI run) | 93.9% | 48.9% | Claude Opus 5 |
| ARC-AGI | 97.5% | 0.0% | Claude Opus 5 |
| ARC-AGI-2 | 90.4% | 0.0% | Claude Opus 5 |
| SimpleBench | 80.6% | Not measured | Only Claude Opus 5 measured |
| Chess puzzles | 43.0% | 0.0% | Claude Opus 5 |
| Mystery game puzzles | 59.0% | Not measured | Only Claude Opus 5 measured |
| EBR-bench | 45.7% | Not measured | Only Claude Opus 5 measured |
| LMArena Text: hard prompts | 1527 | 1286 | Claude Opus 5 |
| LMArena Text: expert | 1554 | 1271 | Claude Opus 5 |
| LMArena Text: hard prompts in English | 1523 | 1293 | Claude Opus 5 |
| LMArena Vision: diagrams | 1348 | Not measured | Only Claude Opus 5 measured |
| LMArena Vision: homework | 1338 | Not measured | Only Claude Opus 5 measured |
| Neither model has a result on the other 3 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index30
| Benchmark | Claude Opus 5 | GPT-4.1 Nano | Leader |
|---|---|---|---|
| AIME | Not measured | 26.5% | Only GPT-4.1 Nano measured |
| MATH 500 (Vals AI) | Not measured | 80.2% | Only GPT-4.1 Nano measured |
| MGSM (Vals AI) | Not measured | 69.3% | Only GPT-4.1 Nano measured |
| AA Math Index | Not measured | 24.0 | Only GPT-4.1 Nano measured |
| AIME 2025 (Artificial Analysis run) | Not measured | 24.0% | Only GPT-4.1 Nano measured |
| OTIS Mock AIME | 98.9% | 28.9% | Claude Opus 5 |
| FrontierMath, tiers 1 to 3 | 85.6% | Not measured | Only Claude Opus 5 measured |
| FrontierMath, tier 4 | 73.2% | Not measured | Only Claude Opus 5 measured |
| ProofBench | 99.0% | Not measured | Only Claude Opus 5 measured |
| MATH level 5 | Not measured | 70.0% | Only GPT-4.1 Nano measured |
| LMArena Text: math | 1533 | 1274 | Claude Opus 5 |
| LMArena Text: mathematical work | 1544 | 1274 | Claude Opus 5 |
| Neither model has a result on the other 1 board here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index100
| Benchmark | Claude Opus 5 | GPT-4.1 Nano | Leader |
|---|---|---|---|
| MMLU Pro | 91.6% | 63.5% | Claude Opus 5 |
| LegalBench (Vals AI) | 87.0% | 61.1% | Claude Opus 5 |
| CorpFin (Vals AI) | 73.2% | 42.1% | Claude Opus 5 |
| TaxEval (Vals AI) | 75.1% | 60.8% | Claude Opus 5 |
| MortgageTax (Vals AI) | 72.1% | 52.8% | Claude Opus 5 |
| MedQA (Vals AI) | Not measured | 68.2% | Only GPT-4.1 Nano measured |
| MedCode (Vals AI) | 63.6% | Not measured | Only Claude Opus 5 measured |
| MMLU Pro (Artificial Analysis run) | Not measured | 65.7% | Only GPT-4.1 Nano measured |
| SimpleQA Verified | 59.9% | 6.0% | Claude Opus 5 |
| LMArena Text: science | 1531 | 1297 | Claude Opus 5 |
| LMArena Text: medicine and healthcare | 1525 | 1276 | Claude Opus 5 |
| LMArena Text: legal and government | 1530 | 1300 | Claude Opus 5 |
| LMArena Text: business and finance | 1501 | 1267 | Claude Opus 5 |
| Neither model has a result on the other 4 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index60
| Benchmark | Claude Opus 5 | GPT-4.1 Nano | Leader |
|---|---|---|---|
| Design Arena: websites | 1309 | 973 | Claude Opus 5 |
| Design Arena: UI components | 1348 | 916 | Claude Opus 5 |
| Design Arena: game dev | 1339 | 971 | Claude Opus 5 |
| Design Arena: data viz | 1329 | 891 | Claude Opus 5 |
| Design Arena: 3D | 1335 | 925 | Claude Opus 5 |
| Design Arena: all code categories | 1324 | 963 | Claude Opus 5 |
| Design Arena: SVG | 1310 | Not measured | Only Claude Opus 5 measured |
| Design Arena: ASCII art | 1352 | Not measured | Only Claude Opus 5 measured |
| LiveBench design | 83.0% | Not measured | Only Claude Opus 5 measured |
GeneralLike-for-likePublic boards, shown as published, kept out of the index180
| Benchmark | Claude Opus 5 | GPT-4.1 Nano | Leader |
|---|---|---|---|
| LiveBench data analysis | 74.6% | Not measured | Only Claude Opus 5 measured |
| Public Benefits Bench (Vals AI) | 76.9% | Not measured | Only Claude Opus 5 measured |
| SAGE (Vals AI) | 49.4% | Not measured | Only Claude Opus 5 measured |
| MedScribe (Vals AI) | 91.0% | Not measured | Only Claude Opus 5 measured |
| Vals Multimodal Index | 73.9% | Not measured | Only Claude Opus 5 measured |
| IFBench | Not measured | 32.0% | Only GPT-4.1 Nano measured |
| Long context reasoning (AA-LCR) | 82.0% | 20.3% | Claude Opus 5 |
| DTBench | 97.9% | 52.5% | Claude Opus 5 |
| LMCA | 64.5% | 5.5% | Claude Opus 5 |
| Fiction.LiveBench | Not measured | 25.0% | Only GPT-4.1 Nano measured |
| Furniture assembly | 60.8% | Not measured | Only Claude Opus 5 measured |
| LMArena Text | 1509 | 1285 | Claude Opus 5 |
| LMArena Text: instruction following | 1518 | 1266 | Claude Opus 5 |
| LMArena Text: creative writing | 1493 | 1260 | Claude Opus 5 |
| LMArena Vision | 1320 | 1063 | Claude Opus 5 |
| LMArena Text: English | 1508 | 1303 | Claude Opus 5 |
| LMArena Text: non-English | 1502 | 1260 | Claude Opus 5 |
| LMArena Text: Chinese | 1573 | 1270 | Claude Opus 5 |
| LMArena Text: German | 1527 | 1288 | Claude Opus 5 |
| LMArena Text: Japanese | 1520 | 1198 | Claude Opus 5 |
| LMArena Text: Korean | 1517 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: French | 1519 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: Spanish | 1523 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: Russian | 1507 | 1261 | Claude Opus 5 |
| LMArena Text: Polish | 1522 | Not measured | Only Claude Opus 5 measured |
| LMArena Text: multi-turn | 1500 | 1277 | Claude Opus 5 |
| LMArena Text: longer queries | 1517 | 1283 | Claude Opus 5 |
| LMArena Text: writing and language | 1499 | 1261 | Claude Opus 5 |
| LMArena Text: entertainment and media | 1481 | 1243 | Claude Opus 5 |
| LMArena Vision: English | 1315 | 1101 | Claude Opus 5 |
| LMArena Vision: Chinese | 1400 | Not measured | Only Claude Opus 5 measured |
| LMArena Vision: reading text | 1329 | Not measured | Only Claude Opus 5 measured |
| LMArena Vision: humor | 1293 | Not measured | Only Claude Opus 5 measured |
| LMArena Vision: creative writing | 1313 | Not measured | Only Claude Opus 5 measured |
| LMArena Document | 1516 | Not measured | Only Claude Opus 5 measured |
| Neither model has a result on the other 11 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Claude Opus 5 | GPT-4.1 Nano | 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 5$0.018Fits in one request
GPT-4.1 Nano$0.0003Fits in one request
GPT-4.1 Nano costs less
Repository review
50K input + 3K output tokens
Claude Opus 5$0.325Fits in one request
GPT-4.1 Nano$0.0062Fits in one request
GPT-4.1 Nano costs less
Agent loop
200K input + 10K output tokens
Claude Opus 5$1.25Fits in one request
GPT-4.1 Nano$0.024Fits in one request
GPT-4.1 Nano 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 5 | OpenAI GPT-4.1 Nano |
|---|---|---|
| Maker | Anthropic | OpenAI |
| Weights | No public weights listed | No public weights listed |
| Released | July 24, 2026 | April 14, 2025 |
| Context window | 1M | 1.05M |
| Input $/Mtok | $5.00 | $0.10 |
| Output $/Mtok | $25.00 | $0.40 |
| Coding index | 81.8 | 8.9 |
| Independent measurements behind it | 2 | 1 |
| Cost per solved task | $1.33 | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Claude Opus 5 better than GPT-4.1 Nano for coding?
Pick Claude Opus 5 for coding: it scores 81.8 on the Vibe Coding Index against 8.9 for GPT-4.1 Nano. Pick GPT-4.1 Nano when output tokens cost 62.5x less, or when the context window is larger, 1.05M against 1M tokens.
Which is cheaper, Claude Opus 5 or GPT-4.1 Nano?
Claude Opus 5 costs $5.00 per million input tokens and $25.00 per million output tokens; GPT-4.1 Nano costs $0.10 and $0.40. Cost per solved task is known for Claude Opus 5 only.
Which has the bigger context window, Claude Opus 5 or GPT-4.1 Nano?
GPT-4.1 Nano, with 1.05M tokens against 1M.
How many benchmarks is the Claude Opus 5 vs GPT-4.1 Nano comparison based on?
55 benchmarks have a result for both models as of October 21, 2026. Claude Opus 5's coding index rests on 2 independent benchmarks and GPT-4.1 Nano's on 1. Where only one model has a result, the page says so instead of naming a winner.