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Claude Opus 4.1 vs Claude Sonnet 5

Claude Sonnet 5 leads Claude Opus 4.1 on the Artificial Analysis Intelligence Index, 38.2 to 22.8, and Claude Sonnet 5 costs 7.5x less per output token ($10.00 vs $75.00 per million). Updated October 22, 2026; 60 benchmarks have a result for both.

Replace Claude Opus 4.1 Replace Claude Sonnet 5
Claude Opus 4.1Anthropic
Coding
No data
Overall
50.2
Output $/M
$75.00
2
Claude Sonnet 5Anthropic
Coding
57.7
Overall
63.2
Output $/M
$10.00
58
vs boards won of 60 shared

Claude Opus 4.1 or Claude Sonnet 5: which to pick

Only Claude Sonnet 5 has a coding score, 57.7 on the Vibe Coding Index; Claude Opus 4.1 has none, so the two cannot be ranked on coding.

Pick Claude Opus 4.1 for work measured by MMLU Pro or LMArena Text: Spanish, where it leads.

Model AClaude Opus 4.1AnthropicNot benchmarked1 independent benchmarkNo cost per solved taskModel BClaude Sonnet 5Anthropic57.7/1006 independent benchmarks$1.87 per solved task
Shared results
60
Claude Opus 4.1 only
13
Claude Sonnet 5 only
61
Like-for-like categories
7 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.

At a glance

Coding index
Claude Opus 4.1 not benchmarked, Claude Sonnet 5 57.7 from 6 benchmarks.
Widest category
Math, 23.9 points apart on average over 5 shared benchmarks.
Widest single gap
FrontierMath, tiers 1 to 3: Claude Opus 4.1 12.6% against Claude Sonnet 5 65.6%, 53.0 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.1 $75.00 against Claude Sonnet 5 $10.00 per million output tokens, 7.5x apart.
Context window
Claude Opus 4.1 takes 200K tokens, Claude Sonnet 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.

Boards won, where both have a result
CategoryClaude Opus 4.1BarsClaude Sonnet 5Ties
Coding07
Intelligence02
Reasoning08
Math05
Knowledge18
Web design08
General120
All shared boards258
CodingLike-for-likeSix of these boards feed the Vibe Coding Index07
Coding benchmarks for Claude Opus 4.1 and Claude Sonnet 5
BenchmarkClaude Opus 4.1Claude Sonnet 5Leader
LiveBench codingNot measured74.7%Only Claude Sonnet 5 measured
LMArena WebDev13901540Claude Sonnet 5
AA Coding IndexNot measured71.5Only Claude Sonnet 5 measured
LiveCodeBench (Vals AI)66.5%82.4%Claude Sonnet 5
SWE-bench Verified (Vals AI)Not measured79.6%Only Claude Sonnet 5 measured
Terminal-Bench 4 (Vals AI)Not measured10.6%Only Claude Sonnet 5 measured
Vibe Code Bench (Vals AI)Not measured81.3%Only Claude Sonnet 5 measured
Code migration (Vals AI)Not measured44.4%Only Claude Sonnet 5 measured
ProgramBench (Vals AI)Not measured0.0%Only Claude Sonnet 5 measured
IOI (Vals AI)Not measured45.0%Only Claude Sonnet 5 measured
Terminal-Bench 2.1 (Vals AI)Not measured74.5%Only Claude Sonnet 5 measured
Vibe Code Bench 1-100 (Vals AI)Not measured13.8%Only Claude Sonnet 5 measured
SkillsBench (Vals AI)Not measured46.5%Only Claude Sonnet 5 measured
CyberBench (Vals AI)Not measured70.3%Only Claude Sonnet 5 measured
SciCodeNot measured54.3%Only Claude Sonnet 5 measured
Terminal-Bench38.0%Not measuredOnly Claude Opus 4.1 measured
FrontierCodeNot measured42.7%Only Claude Sonnet 5 measured
GSO-BenchNot measured37.3%Only Claude Sonnet 5 measured
WeirdML45.9%68.8%Claude Sonnet 5
Cybench42.0%Not measuredOnly Claude Opus 4.1 measured
ALE-BenchNot measured1463.1Only Claude Sonnet 5 measured
LMArena Text: coding14791483Claude Sonnet 5
LMArena Text: software and IT14561474Claude Sonnet 5
LMArena WebDev: ReactNot measured1541Only Claude Sonnet 5 measured
LMArena WebDev: HTML13991527Claude Sonnet 5
LMArena WebDev: from an imageNot measured1540Only Claude Sonnet 5 measured
SciCode4.6%10.7%Claude Sonnet 5
Neither model has a result on the other 12 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Claude Opus 4.1 and Claude Sonnet 5
BenchmarkClaude Opus 4.1Claude Sonnet 5Leader
AA Intelligence Index22.838.2Claude Sonnet 5
Epoch Capabilities Index144.1156.9Claude Sonnet 5
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index24 boards, none shared
Agentic work benchmarks for Claude Opus 4.1 and Claude Sonnet 5
BenchmarkClaude Opus 4.1Claude Sonnet 5Leader
AA Agentic IndexNot measured43.6Only Claude Sonnet 5 measured
Design Arena: agents building web appsNot measured1245Only Claude Sonnet 5 measured
Design Arena: agents building full-stack appsNot measured1249Only Claude Sonnet 5 measured
Design Arena: agents building mobile appsNot measured1215Only Claude Sonnet 5 measured
Design Arena: agents building Android appsNot measured1227Only Claude Sonnet 5 measured
Design Arena: agents building Godot gamesNot measured1225Only Claude Sonnet 5 measured
Design Arena: agents building gamesNot measured1227Only Claude Sonnet 5 measured
Design Arena: HTML slidesNot measured1168Only Claude Sonnet 5 measured
Design Arena: PowerPoint slidesNot measured1191Only Claude Sonnet 5 measured
Design Arena: spreadsheetsNot measured1035Only Claude Sonnet 5 measured
LiveBench researchNot measured82.8%Only Claude Sonnet 5 measured
LiveBench browserNot measured72.0%Only Claude Sonnet 5 measured
LiveBench long agenticNot measured39.0%Only Claude Sonnet 5 measured
SREBench (Vals AI)Not measured0.4%Only Claude Sonnet 5 measured
Finance Agent (Vals AI)Not measured53.9%Only Claude Sonnet 5 measured
Tax Agent Bench (Vals AI)Not measured29.4%Only Claude Sonnet 5 measured
Legal Research Bench (Vals AI)Not measured41.8%Only Claude Sonnet 5 measured
Excel Modeling Benchmark (Vals AI)Not measured66.3%Only Claude Sonnet 5 measured
Terminal-Bench-Science (Vals AI)Not measured5.7%Only Claude Sonnet 5 measured
APEX-AgentsNot measured54.5%Only Claude Sonnet 5 measured
METR time horizons66.8%Not measuredOnly Claude Opus 4.1 measured
GDPval43.6%Not measuredOnly Claude Opus 4.1 measured
DeepResearch Bench48.3%Not measuredOnly Claude Opus 4.1 measured
Vending-Bench 2Not measured$6,378Only Claude Sonnet 5 measured
Neither model has a result on the other 17 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index08
Reasoning benchmarks for Claude Opus 4.1 and Claude Sonnet 5
BenchmarkClaude Opus 4.1Claude Sonnet 5Leader
GPQA Diamond76.3%88.9%Claude Sonnet 5
LiveBench reasoningNot measured88.7%Only Claude Sonnet 5 measured
MMMU Pro (Vals AI)77.5%83.0%Claude Sonnet 5
GPQA Diamond (Artificial Analysis run)Not measured91.1%Only Claude Sonnet 5 measured
Humanity's Last Exam (Artificial Analysis run)Not measured41.3%Only Claude Sonnet 5 measured
GPQA Diamond (Epoch AI run)77.3%90.5%Claude Sonnet 5
SimpleBench60.0%60.6%Claude Sonnet 5
Chess puzzlesNot measured45.0%Only Claude Sonnet 5 measured
Mystery game puzzles21.0%35.0%Claude Sonnet 5
EBR-bench7.9%Not measuredOnly Claude Opus 4.1 measured
VPCT35.0%Not measuredOnly Claude Opus 4.1 measured
LMArena Text: hard prompts14421461Claude Sonnet 5
LMArena Text: expert14381489Claude Sonnet 5
LMArena Text: hard prompts in English14511464Claude Sonnet 5
LMArena Vision: diagramsNot measured1293Only Claude Sonnet 5 measured
LMArena Vision: homeworkNot measured1311Only Claude Sonnet 5 measured
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index05
Math benchmarks for Claude Opus 4.1 and Claude Sonnet 5
BenchmarkClaude Opus 4.1Claude Sonnet 5Leader
AIME78.2%Not measuredOnly Claude Opus 4.1 measured
MATH 500 (Vals AI)95.4%Not measuredOnly Claude Opus 4.1 measured
MGSM (Vals AI)94.4%Not measuredOnly Claude Opus 4.1 measured
OTIS Mock AIME68.9%94.7%Claude Sonnet 5
FrontierMath, tiers 1 to 312.6%65.6%Claude Sonnet 5
FrontierMath, tier 42.4%29.3%Claude Sonnet 5
ProofBenchNot measured77.0%Only Claude Sonnet 5 measured
LMArena Text: math14311467Claude Sonnet 5
LMArena Text: mathematical work14341481Claude Sonnet 5
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index18
Knowledge benchmarks for Claude Opus 4.1 and Claude Sonnet 5
BenchmarkClaude Opus 4.1Claude Sonnet 5Leader
MMLU Pro87.9%87.5%Claude Opus 4.1
LegalBench (Vals AI)83.5%83.9%Claude Sonnet 5
CorpFin (Vals AI)Not measured67.0%Only Claude Sonnet 5 measured
TaxEval (Vals AI)73.7%75.6%Claude Sonnet 5
MortgageTax (Vals AI)61.1%70.0%Claude Sonnet 5
MedQA (Vals AI)93.6%Not measuredOnly Claude Opus 4.1 measured
MedCode (Vals AI)47.2%47.5%Claude Sonnet 5
SimpleQA VerifiedNot measured33.7%Only Claude Sonnet 5 measured
LMArena Text: science14221460Claude Sonnet 5
LMArena Text: medicine and healthcare14161442Claude Sonnet 5
LMArena Text: legal and government14211454Claude Sonnet 5
LMArena Text: business and finance14061436Claude Sonnet 5
FACTS Benchmark Suite40.4%Not measuredOnly Claude Opus 4.1 measured
Neither model has a result on the other 5 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index08
Web design benchmarks for Claude Opus 4.1 and Claude Sonnet 5
BenchmarkClaude Opus 4.1Claude Sonnet 5Leader
Design Arena: websites11761274Claude Sonnet 5
Design Arena: UI components11621277Claude Sonnet 5
Design Arena: game dev11711277Claude Sonnet 5
Design Arena: data viz11661251Claude Sonnet 5
Design Arena: 3D11521261Claude Sonnet 5
Design Arena: all code categories11701275Claude Sonnet 5
Design Arena: SVG11521192Claude Sonnet 5
Design Arena: ASCII art11671207Claude Sonnet 5
LiveBench designNot measured82.0%Only Claude Sonnet 5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index120
General benchmarks for Claude Opus 4.1 and Claude Sonnet 5
BenchmarkClaude Opus 4.1Claude Sonnet 5Leader
LiveBench data analysisNot measured71.7%Only Claude Sonnet 5 measured
Public Benefits Bench (Vals AI)Not measured66.0%Only Claude Sonnet 5 measured
SAGE (Vals AI)31.4%48.9%Claude Sonnet 5
MedScribe (Vals AI)73.9%76.0%Claude Sonnet 5
Vals Multimodal IndexNot measured68.8%Only Claude Sonnet 5 measured
Long context reasoning (AA-LCR)Not measured82.0%Only Claude Sonnet 5 measured
DTBench80.0%92.5%Claude Sonnet 5
LMCA37.1%50.0%Claude Sonnet 5
Creative writing (Lech Mazur)84.7%Not measuredOnly Claude Opus 4.1 measured
Surface Evolver BenchNot measured60.0%Only Claude Sonnet 5 measured
LMArena Text14191442Claude Sonnet 5
LMArena Text: instruction following14351452Claude Sonnet 5
LMArena Text: creative writing14121416Claude Sonnet 5
LMArena VisionNot measured1273Only Claude Sonnet 5 measured
LMArena Text: English14331450Claude Sonnet 5
LMArena Text: non-English14051431Claude Sonnet 5
LMArena Text: Chinese14271478Claude Sonnet 5
LMArena Text: German14131442Claude Sonnet 5
LMArena Text: Japanese13771422Claude Sonnet 5
LMArena Text: Korean13811412Claude Sonnet 5
LMArena Text: French14331463Claude Sonnet 5
LMArena Text: Spanish14481438Claude Opus 4.1
LMArena Text: Russian14221450Claude Sonnet 5
LMArena Text: Polish14131425Claude Sonnet 5
LMArena Text: multi-turn14441453Claude Sonnet 5
LMArena Text: longer queries14551462Claude Sonnet 5
LMArena Text: writing and language14181436Claude Sonnet 5
LMArena Text: entertainment and media13981411Claude Sonnet 5
LMArena Vision: EnglishNot measured1275Only Claude Sonnet 5 measured
LMArena Vision: ChineseNot measured1331Only Claude Sonnet 5 measured
LMArena Vision: reading textNot measured1288Only Claude Sonnet 5 measured
LMArena Vision: humorNot measured1261Only Claude Sonnet 5 measured
LMArena Vision: creative writingNot measured1246Only Claude Sonnet 5 measured
LMArena DocumentNot measured1466Only Claude Sonnet 5 measured
Neither model has a result on the other 12 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 4.1 and Claude Sonnet 5
BenchmarkClaude Opus 4.1Claude Sonnet 5Leader
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 Sonnet 5$0.0070Fits in one request

Claude Sonnet 5 costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.1$0.975Fits in one request
Claude Sonnet 5$0.130Fits in one request

Claude Sonnet 5 costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.1$3.75Exceeds the context window
Claude Sonnet 5$0.500Fits in one request

Claude Sonnet 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.

Specifications of Claude Opus 4.1 and Claude Sonnet 5
SpecificationAnthropic Claude Opus 4.1Anthropic Claude Sonnet 5
MakerAnthropicAnthropic
WeightsNo public weights listedNo public weights listed
ReleasedAugust 5, 2025June 30, 2026
Context window200K1M
Input $/Mtok$15.00$2.00
Output $/Mtok$75.00$10.00
Coding indexNot benchmarked57.7
Independent measurements behind it16
Cost per solved taskNot computable$1.87
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.1 better than Claude Sonnet 5 for coding?

Only Claude Sonnet 5 has a coding score, 57.7 on the Vibe Coding Index; Claude Opus 4.1 has none, so the two cannot be ranked on coding. Pick Claude Opus 4.1 for work measured by MMLU Pro or LMArena Text: Spanish, where it leads.

Which is cheaper, Claude Opus 4.1 or Claude Sonnet 5?

Claude Opus 4.1 costs $15.00 per million input tokens and $75.00 per million output tokens; Claude Sonnet 5 costs $2.00 and $10.00. Cost per solved task is known for Claude Sonnet 5 only.

Which has the bigger context window, Claude Opus 4.1 or Claude Sonnet 5?

Claude Sonnet 5, with 1M tokens against 200K.

How many benchmarks is the Claude Opus 4.1 vs Claude Sonnet 5 comparison based on?

60 benchmarks have a result for both models as of October 22, 2026. Claude Opus 4.1's coding index rests on 1 independent benchmark and Claude Sonnet 5's on 6. Where only one model has a result, the page says so instead of naming a winner.

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