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Claude Opus 4.5 vs Claude Sonnet 5

Claude Sonnet 5 leads Claude Opus 4.5 on coding, 57.7 to 44.0 on the Vibe Coding Index, and Claude Sonnet 5 costs 2.5x less per output token ($10.00 vs $25.00 per million). Updated October 22, 2026; 76 benchmarks have a result for both.

Replace Claude Opus 4.5 Replace Claude Sonnet 5
Claude Opus 4.5Anthropic
Coding
44.0
Overall
55.7
Output $/M
$25.00
28
Claude Sonnet 5Anthropic
Coding
57.7
Overall
63.2
Output $/M
$10.00
48
vs boards won of 76 shared

Claude Opus 4.5 or Claude Sonnet 5: which to pick

Pick Claude Sonnet 5 for coding: it scores 57.7 on the Vibe Coding Index against 44.0 for Claude Opus 4.5.

Pick Claude Opus 4.5 for a lower cost per solved task ($1.37 against $1.87) and work measured by LiveCodeBench (Vals AI) or LMArena Text: coding, where it leads.

Model AClaude Opus 4.5Anthropic44.0/1003 independent benchmarks$1.37 per solved taskModel BClaude Sonnet 5Anthropic57.7/1006 independent benchmarks$1.87 per solved task
Shared results
76
Claude Opus 4.5 only
32
Claude Sonnet 5 only
45
Like-for-like categories
8 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 4.5 44.0 from 3 benchmarks, Claude Sonnet 5 57.7 from 6 benchmarks.
Widest category
Math, 18.0 points apart on average over 6 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): Claude Opus 4.5 20.6% against Claude Sonnet 5 81.3%, 60.7 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.5 $25.00 against Claude Sonnet 5 $10.00 per million output tokens, 2.5x apart.
Context window
Claude Opus 4.5 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 4.5BarsClaude Sonnet 5Ties
Coding37
Intelligence02
Agentic work05
Reasoning38
Math06
Knowledge65
Web design08
General167
All shared boards2848
CodingLike-for-likeSix of these boards feed the Vibe Coding Index37
Coding benchmarks for Claude Opus 4.5 and Claude Sonnet 5
BenchmarkClaude Opus 4.5Claude Sonnet 5Leader
SWE-bench Verified79.2%Not measuredOnly Claude Opus 4.5 measured
SWE-bench (full test set)52.6%Not measuredOnly Claude Opus 4.5 measured
SWE-bench Multilingual70.7%Not measuredOnly Claude Opus 4.5 measured
LiveBench codingNot measured74.7%Only Claude Sonnet 5 measured
LMArena WebDev14941540Claude Sonnet 5
AA Coding IndexNot measured71.5Only Claude Sonnet 5 measured
LiveCodeBench (Vals AI)83.7%82.4%Claude Opus 4.5
SWE-bench Verified (Vals AI)76.4%79.6%Claude Sonnet 5
Terminal-Bench 4 (Vals AI)Not measured10.6%Only Claude Sonnet 5 measured
Vibe Code Bench (Vals AI)20.6%81.3%Claude Sonnet 5
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
LiveCodeBench (Artificial Analysis run)87.1%Not measuredOnly Claude Opus 4.5 measured
SciCodeNot measured54.3%Only Claude Sonnet 5 measured
Terminal-Bench Hard (Artificial Analysis run)47.0%Not measuredOnly Claude Opus 4.5 measured
Terminal-Bench63.1%Not measuredOnly Claude Opus 4.5 measured
FrontierCodeNot measured42.7%Only Claude Sonnet 5 measured
GSO-Bench26.5%37.3%Claude Sonnet 5
WeirdML63.7%68.8%Claude Sonnet 5
Cybench82.0%Not measuredOnly Claude Opus 4.5 measured
ALE-BenchNot measured1463.1Only Claude Sonnet 5 measured
LMArena Text: coding15031483Claude Opus 4.5
LMArena Text: software and IT14831474Claude Opus 4.5
LMArena WebDev: React14781541Claude Sonnet 5
LMArena WebDev: HTML15101527Claude Sonnet 5
LMArena WebDev: from an imageNot measured1540Only Claude Sonnet 5 measured
SciCodeNot measured10.7%Only Claude Sonnet 5 measured
Neither model has a result on the other 7 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Claude Opus 4.5 and Claude Sonnet 5
BenchmarkClaude Opus 4.5Claude Sonnet 5Leader
AA Intelligence Index29.138.2Claude Sonnet 5
Epoch Capabilities Index150.1156.9Claude Sonnet 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index05
Agentic work benchmarks for Claude Opus 4.5 and Claude Sonnet 5
BenchmarkClaude Opus 4.5Claude Sonnet 5Leader
AA Agentic IndexNot measured43.6Only Claude Sonnet 5 measured
Design Arena: agents building web apps11591245Claude Sonnet 5
Design Arena: agents building full-stack apps11561249Claude Sonnet 5
Design Arena: agents building mobile apps11891215Claude Sonnet 5
Design Arena: agents building Android apps11761227Claude Sonnet 5
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
τ²-Bench Telecom89.5%Not measuredOnly Claude Opus 4.5 measured
APEX-AgentsNot measured54.5%Only Claude Sonnet 5 measured
METR time horizons75.0%Not measuredOnly Claude Opus 4.5 measured
Remote Labor Index3.8%Not measuredOnly Claude Opus 4.5 measured
GDPval45.5%Not measuredOnly Claude Opus 4.5 measured
BALROG43.5%Not measuredOnly Claude Opus 4.5 measured
DeepResearch Bench54.8%Not measuredOnly Claude Opus 4.5 measured
OSWorld66.3%Not measuredOnly Claude Opus 4.5 measured
Vending-Bench 2$4,967$6,378Claude Sonnet 5
Berkeley Function Calling Leaderboard (BFCL)77.5%Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 12 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index38
Reasoning benchmarks for Claude Opus 4.5 and Claude Sonnet 5
BenchmarkClaude Opus 4.5Claude Sonnet 5Leader
GPQA Diamond85.9%88.9%Claude Sonnet 5
LiveBench reasoningNot measured88.7%Only Claude Sonnet 5 measured
MMMU Pro (Vals AI)83.0%83.0%Claude Sonnet 5
GPQA Diamond (Artificial Analysis run)86.6%91.1%Claude Sonnet 5
Humanity's Last Exam (Artificial Analysis run)30.1%41.3%Claude Sonnet 5
GPQA Diamond (Epoch AI run)86.0%90.5%Claude Sonnet 5
ARC-AGI80.0%Not measuredOnly Claude Opus 4.5 measured
ARC-AGI-237.6%Not measuredOnly Claude Opus 4.5 measured
SimpleBench62.0%60.6%Claude Opus 4.5
Chess puzzles14.0%45.0%Claude Sonnet 5
Mystery game puzzles22.0%35.0%Claude Sonnet 5
EBR-bench14.3%Not measuredOnly Claude Opus 4.5 measured
VPCT40.0%Not measuredOnly Claude Opus 4.5 measured
LMArena Text: hard prompts14761461Claude Opus 4.5
LMArena Text: expert14871489Claude Sonnet 5
LMArena Text: hard prompts in English14821464Claude Opus 4.5
LMArena Vision: diagramsNot measured1293Only Claude Sonnet 5 measured
LMArena Vision: homeworkNot measured1311Only Claude Sonnet 5 measured
Kagi LLM Benchmark80.2%Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index06
Math benchmarks for Claude Opus 4.5 and Claude Sonnet 5
BenchmarkClaude Opus 4.5Claude Sonnet 5Leader
AIME95.4%Not measuredOnly Claude Opus 4.5 measured
MGSM (Vals AI)95.2%Not measuredOnly Claude Opus 4.5 measured
AA Math Index91.3Not measuredOnly Claude Opus 4.5 measured
AIME 2025 (Artificial Analysis run)91.3%Not measuredOnly Claude Opus 4.5 measured
OTIS Mock AIME86.1%94.7%Claude Sonnet 5
FrontierMath, tiers 1 to 334.4%65.6%Claude Sonnet 5
FrontierMath, tier 44.9%29.3%Claude Sonnet 5
ProofBench36.0%77.0%Claude Sonnet 5
LMArena Text: math14631467Claude Sonnet 5
LMArena Text: mathematical work14681481Claude Sonnet 5
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index65
Knowledge benchmarks for Claude Opus 4.5 and Claude Sonnet 5
BenchmarkClaude Opus 4.5Claude Sonnet 5Leader
MMLU Pro87.3%87.5%Claude Sonnet 5
LegalBench (Vals AI)84.6%83.9%Claude Opus 4.5
CaseLaw (Vals AI)62.6%Not measuredOnly Claude Opus 4.5 measured
CorpFin (Vals AI)65.1%67.0%Claude Sonnet 5
TaxEval (Vals AI)74.9%75.6%Claude Sonnet 5
MortgageTax (Vals AI)68.7%70.0%Claude Sonnet 5
MedQA (Vals AI)95.9%Not measuredOnly Claude Opus 4.5 measured
MedCode (Vals AI)49.2%47.5%Claude Opus 4.5
MMLU Pro (Artificial Analysis run)89.5%Not measuredOnly Claude Opus 4.5 measured
SimpleQA Verified45.7%33.7%Claude Opus 4.5
GeoBench75.0%Not measuredOnly Claude Opus 4.5 measured
LMArena Text: science14541460Claude Sonnet 5
LMArena Text: medicine and healthcare14441442Claude Opus 4.5
LMArena Text: legal and government14591454Claude Opus 4.5
LMArena Text: business and finance14481436Claude Opus 4.5
FACTS Benchmark Suite43.9%Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 2 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index08
Web design benchmarks for Claude Opus 4.5 and Claude Sonnet 5
BenchmarkClaude Opus 4.5Claude Sonnet 5Leader
Design Arena: websites12471274Claude Sonnet 5
Design Arena: UI components12351277Claude Sonnet 5
Design Arena: game dev12281277Claude Sonnet 5
Design Arena: data viz12431251Claude Sonnet 5
Design Arena: 3D12131261Claude Sonnet 5
Design Arena: all code categories12421275Claude Sonnet 5
Design Arena: SVG11801192Claude Sonnet 5
Design Arena: ASCII art11901207Claude Sonnet 5
LiveBench designNot measured82.0%Only Claude Sonnet 5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index167
General benchmarks for Claude Opus 4.5 and Claude Sonnet 5
BenchmarkClaude Opus 4.5Claude 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)52.1%48.9%Claude Opus 4.5
MedScribe (Vals AI)85.3%76.0%Claude Opus 4.5
Vals Multimodal IndexNot measured68.8%Only Claude Sonnet 5 measured
IFBench58.0%Not measuredOnly Claude Opus 4.5 measured
Long context reasoning (AA-LCR)77.3%82.0%Claude Sonnet 5
DTBench89.9%92.5%Claude Sonnet 5
LMCA44.5%50.0%Claude Sonnet 5
CL-bench21.1%Not measuredOnly Claude Opus 4.5 measured
Surface Evolver BenchNot measured60.0%Only Claude Sonnet 5 measured
Furniture assembly28.3%Not measuredOnly Claude Opus 4.5 measured
LMArena Text14511442Claude Opus 4.5
LMArena Text: instruction following14781452Claude Opus 4.5
LMArena Text: creative writing14451416Claude Opus 4.5
LMArena VisionNot measured1273Only Claude Sonnet 5 measured
LMArena Text: English14611450Claude Opus 4.5
LMArena Text: non-English14381431Claude Opus 4.5
LMArena Text: Chinese14701478Claude Sonnet 5
LMArena Text: German14491442Claude Opus 4.5
LMArena Text: Japanese14171422Claude Sonnet 5
LMArena Text: Korean14241412Claude Opus 4.5
LMArena Text: French14711463Claude Opus 4.5
LMArena Text: Spanish14571438Claude Opus 4.5
LMArena Text: Russian14471450Claude Sonnet 5
LMArena Text: Polish14391425Claude Opus 4.5
LMArena Text: multi-turn14661453Claude Opus 4.5
LMArena Text: longer queries14791462Claude Opus 4.5
LMArena Text: writing and language14521436Claude Opus 4.5
LMArena Text: entertainment and media14341411Claude Opus 4.5
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 Document14621466Claude Sonnet 5
Neither model has a result on the other 10 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 4.5 and Claude Sonnet 5
BenchmarkClaude Opus 4.5Claude 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 4.5$0.018Fits 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 4.5$0.325Fits 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 4.5$1.25Exceeds 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 4.5 and Claude Sonnet 5
SpecificationAnthropic Claude Opus 4.5Anthropic Claude Sonnet 5
MakerAnthropicAnthropic
WeightsNo public weights listedNo public weights listed
ReleasedNovember 24, 2025June 30, 2026
Context window200K1M
Input $/Mtok$5.00$2.00
Output $/Mtok$25.00$10.00
Coding index44.057.7
Independent measurements behind it36
Cost per solved task$1.37$1.87
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.5 better than Claude Sonnet 5 for coding?

Pick Claude Sonnet 5 for coding: it scores 57.7 on the Vibe Coding Index against 44.0 for Claude Opus 4.5. Pick Claude Opus 4.5 for a lower cost per solved task ($1.37 against $1.87) and work measured by LiveCodeBench (Vals AI) or LMArena Text: coding, where it leads.

Which is cheaper, Claude Opus 4.5 or Claude Sonnet 5?

Claude Opus 4.5 costs $5.00 per million input tokens and $25.00 per million output tokens; Claude Sonnet 5 costs $2.00 and $10.00. Per solved SWE-bench Verified task, Claude Opus 4.5 costs $1.37 and Claude Sonnet 5 $1.87.

Which has the bigger context window, Claude Opus 4.5 or Claude Sonnet 5?

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

How many benchmarks is the Claude Opus 4.5 vs Claude Sonnet 5 comparison based on?

76 benchmarks have a result for both models as of October 22, 2026. Claude Opus 4.5's coding index rests on 3 independent benchmarks 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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<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/claude-opus-4-5-vs-claude-sonnet-5">LLMBenchmark.ai, Claude Opus 4.5 vs Claude Sonnet 5</a></p>