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Claude Opus 5 vs Claude Sonnet 4.5

Claude Opus 5 leads Claude Sonnet 4.5 on coding, 83.0 to 39.5 on the Vibe Coding Index, and Claude Sonnet 4.5 costs 1.7x less per output token ($15.00 vs $25.00 per million). Updated October 22, 2026; 76 benchmarks have a result for both.

Replace Claude Opus 5 Replace Claude Sonnet 4.5
Claude Opus 5Anthropic
Coding
83.0
Overall
81.6
Output $/M
$25.00
76
Claude Sonnet 4.5Anthropic
Coding
39.5
Overall
49.5
Output $/M
$15.00
0
vs boards won of 76 shared

Claude Opus 5 or Claude Sonnet 4.5: which to pick

Pick Claude Opus 5 for coding: it scores 83.0 on the Vibe Coding Index against 39.5 for Claude Sonnet 4.5.

Pick Claude Sonnet 4.5 for output tokens 1.7x cheaper ($15.00 vs $25.00 per million) and a lower cost per solved task ($1.16 against $1.33).

Model AClaude Opus 5Anthropic83.0/1006 independent benchmarks$1.33 per solved taskModel BClaude Sonnet 4.5Anthropic39.5/1003 independent benchmarks$1.16 per solved task
Shared results
76
Claude Opus 5 only
55
Claude Sonnet 4.5 only
19
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 5 83.0 from 6 benchmarks, Claude Sonnet 4.5 39.5 from 3 benchmarks.
Widest category
Math, 43.5 points apart on average over 6 shared benchmarks.
Widest single gap
ProofBench: Claude Opus 5 99.0% against Claude Sonnet 4.5 19.0%, 80.0 points apart on a 0 to 100 scale.
Output price
Claude Opus 5 $25.00 against Claude Sonnet 4.5 $15.00 per million output tokens, 1.7x apart.
Context window
Both take 1M tokens.

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 5BarsClaude Sonnet 4.5Ties
Coding100
Intelligence20
Agentic work50
Reasoning120
Math60
Knowledge110
Web design80
General220
All shared boards760
CodingLike-for-likeSix of these boards feed the Vibe Coding Index100
Coding benchmarks for Claude Opus 5 and Claude Sonnet 4.5
BenchmarkClaude Opus 5Claude Sonnet 4.5Leader
SWE-bench VerifiedNot measured74.8%Only Claude Sonnet 4.5 measured
SWE-bench MultilingualNot measured67.0%Only Claude Sonnet 4.5 measured
LiveBench coding90.8%Not measuredOnly Claude Opus 5 measured
LMArena WebDev16891394Claude Opus 5
AA Coding Index78.052.1Claude Opus 5
LiveCodeBench (Vals AI)89.0%73.0%Claude Opus 5
SWE-bench Verified (Vals AI)97.0%70.0%Claude Opus 5
Terminal-Bench 4 (Vals AI)53.5%Not measuredOnly Claude Opus 5 measured
Vibe Code Bench (Vals AI)88.4%22.6%Claude Opus 5
Code migration (Vals AI)57.5%Not measuredOnly Claude Opus 5 measured
ProgramBench (Vals AI)3.0%Not measuredOnly Claude Opus 5 measured
IOI (Vals AI)84.3%Not measuredOnly Claude Opus 5 measured
Terminal-Bench 2.1 (Vals AI)84.6%Not measuredOnly Claude Opus 5 measured
Vibe Code Bench 1-100 (Vals AI)28.5%Not measuredOnly Claude Opus 5 measured
SkillsBench (Vals AI)60.4%Not measuredOnly Claude Opus 5 measured
CyberBench (Vals AI)65.4%Not measuredOnly Claude Opus 5 measured
SciCode56.4%Not measuredOnly Claude Opus 5 measured
Terminal-BenchNot measured46.5%Only Claude Sonnet 4.5 measured
FrontierCode53.4%Not measuredOnly Claude Opus 5 measured
FrontierSWE52.0%Not measuredOnly Claude Opus 5 measured
GSO-BenchNot measured14.7%Only Claude Sonnet 4.5 measured
WeirdML91.8%47.7%Claude Opus 5
CybenchNot measured60.0%Only Claude Sonnet 4.5 measured
ALE-Bench2164.6Not measuredOnly Claude Opus 5 measured
LMArena Text: coding15331488Claude Opus 5
LMArena Text: software and IT15271473Claude Opus 5
LMArena WebDev: React17111386Claude Opus 5
LMArena WebDev: HTML16801399Claude Opus 5
LMArena WebDev: from an image1662Not measuredOnly Claude Opus 5 measured
SciCode13.8%Not measuredOnly Claude Opus 5 measured
Neither model has a result on the other 9 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 5 and Claude Sonnet 4.5
BenchmarkClaude Opus 5Claude Sonnet 4.5Leader
AA Intelligence Index50.820.7Claude Opus 5
Epoch Capabilities Index163.9146.7Claude Opus 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index50
Agentic work benchmarks for Claude Opus 5 and Claude Sonnet 4.5
BenchmarkClaude Opus 5Claude Sonnet 4.5Leader
AA Agentic Index56.515.8Claude Opus 5
Design Arena: agents building web apps12661060Claude Opus 5
Design Arena: agents building full-stack apps13061050Claude Opus 5
Design Arena: agents building mobile apps13481137Claude Opus 5
Design Arena: agents building Android apps1257Not measuredOnly Claude Opus 5 measured
Design Arena: agents building Godot games1279Not measuredOnly Claude Opus 5 measured
Design Arena: agents building games1261Not measuredOnly Claude Opus 5 measured
Design Arena: PowerPoint slides1240Not measuredOnly Claude Opus 5 measured
LiveBench research88.9%Not measuredOnly Claude Opus 5 measured
LiveBench browser84.0%Not measuredOnly Claude Opus 5 measured
LiveBench long agentic62.1%Not measuredOnly Claude Opus 5 measured
SREBench (Vals AI)12.2%Not measuredOnly Claude Opus 5 measured
Finance Agent (Vals AI)58.6%Not measuredOnly Claude Opus 5 measured
Tax Agent Bench (Vals AI)45.5%Not measuredOnly Claude Opus 5 measured
Legal Research Bench (Vals AI)55.3%Not measuredOnly Claude Opus 5 measured
Excel Modeling Benchmark (Vals AI)73.6%Not measuredOnly Claude Opus 5 measured
BioMysteryBench (Vals AI)79.3%Not measuredOnly Claude Opus 5 measured
Terminal-Bench-Science (Vals AI)27.1%Not measuredOnly Claude Opus 5 measured
Vals Science Index47.9%Not measuredOnly Claude Opus 5 measured
Time Horizon Index (Vals AI)18.8%Not measuredOnly Claude Opus 5 measured
CUA-bench (Vals AI)9.0%Not measuredOnly Claude Opus 5 measured
APEX-Agents65.8%Not measuredOnly Claude Opus 5 measured
METR time horizonsNot measured67.4%Only Claude Sonnet 4.5 measured
Remote Labor IndexNot measured2.1%Only Claude Sonnet 4.5 measured
GDPvalNot measured42.5%Only Claude Sonnet 4.5 measured
OSWorld 2.031.4%Not measuredOnly Claude Opus 5 measured
BALROG63.4%Not measuredOnly Claude Opus 5 measured
DeepResearch BenchNot measured52.6%Only Claude Sonnet 4.5 measured
PostTrainBench35.0%Not measuredOnly Claude Opus 5 measured
OSWorldNot measured62.9%Only Claude Sonnet 4.5 measured
Vending-Bench 2$11,182$3,839Claude Opus 5
LMArena Search1242Not measuredOnly Claude Opus 5 measured
Berkeley Function Calling Leaderboard (BFCL)Not measured73.2%Only Claude Sonnet 4.5 measured
Neither model has a result on the other 8 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index120
Reasoning benchmarks for Claude Opus 5 and Claude Sonnet 4.5
BenchmarkClaude Opus 5Claude Sonnet 4.5Leader
GPQA Diamond93.4%81.6%Claude Opus 5
LiveBench reasoning91.2%Not measuredOnly Claude Opus 5 measured
MysteryMechanism (Vals AI)37.4%Not measuredOnly Claude Opus 5 measured
MMMU Pro (Vals AI)89.9%79.3%Claude Opus 5
GPQA Diamond (Artificial Analysis run)93.7%Not measuredOnly Claude Opus 5 measured
Humanity's Last Exam (Artificial Analysis run)54.9%Not measuredOnly Claude Opus 5 measured
GPQA Diamond (Epoch AI run)93.9%82.3%Claude Opus 5
ARC-AGI97.5%63.7%Claude Opus 5
ARC-AGI-290.4%13.6%Claude Opus 5
SimpleBench80.6%54.3%Claude Opus 5
Chess puzzles43.0%10.0%Claude Opus 5
Mystery game puzzles59.0%17.0%Claude Opus 5
EBR-bench45.7%2.4%Claude Opus 5
VPCTNot measured39.8%Only Claude Sonnet 4.5 measured
LMArena Text: hard prompts15271462Claude Opus 5
LMArena Text: expert15541483Claude Opus 5
LMArena Text: hard prompts in English15231471Claude Opus 5
LMArena Vision: diagrams1348Not measuredOnly Claude Opus 5 measured
LMArena Vision: homework1338Not measuredOnly Claude Opus 5 measured
Kagi LLM BenchmarkNot measured57.9%Only Claude Sonnet 4.5 measured
Neither model has a result on the other 2 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Opus 5 and Claude Sonnet 4.5
BenchmarkClaude Opus 5Claude Sonnet 4.5Leader
AIMENot measured88.2%Only Claude Sonnet 4.5 measured
MGSM (Vals AI)Not measured94.3%Only Claude Sonnet 4.5 measured
OTIS Mock AIME98.9%77.8%Claude Opus 5
FrontierMath, tiers 1 to 385.6%23.9%Claude Opus 5
FrontierMath, tier 473.2%2.4%Claude Opus 5
ProofBench99.0%19.0%Claude Opus 5
MATH level 5Not measured97.7%Only Claude Sonnet 4.5 measured
LMArena Text: math15331449Claude Opus 5
LMArena Text: mathematical work15441462Claude Opus 5
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index110
Knowledge benchmarks for Claude Opus 5 and Claude Sonnet 4.5
BenchmarkClaude Opus 5Claude Sonnet 4.5Leader
MMLU Pro91.6%87.4%Claude Opus 5
LegalBench (Vals AI)87.0%84.1%Claude Opus 5
CaseLaw (Vals AI)Not measured62.2%Only Claude Sonnet 4.5 measured
CorpFin (Vals AI)73.2%62.0%Claude Opus 5
TaxEval (Vals AI)75.1%73.3%Claude Opus 5
MortgageTax (Vals AI)72.1%64.0%Claude Opus 5
MedQA (Vals AI)Not measured94.7%Only Claude Sonnet 4.5 measured
MedCode (Vals AI)63.6%44.1%Claude Opus 5
SimpleQA Verified59.9%30.7%Claude Opus 5
LMArena Text: science15311448Claude Opus 5
LMArena Text: medicine and healthcare15251444Claude Opus 5
LMArena Text: legal and government15301451Claude Opus 5
LMArena Text: business and finance15011440Claude Opus 5
FACTS Benchmark SuiteNot measured40.6%Only Claude Sonnet 4.5 measured
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for Claude Opus 5 and Claude Sonnet 4.5
BenchmarkClaude Opus 5Claude Sonnet 4.5Leader
Design Arena: websites13091189Claude Opus 5
Design Arena: UI components13461170Claude Opus 5
Design Arena: game dev13371166Claude Opus 5
Design Arena: data viz13291167Claude Opus 5
Design Arena: 3D13341157Claude Opus 5
Design Arena: all code categories13231182Claude Opus 5
Design Arena: SVG13111115Claude Opus 5
Design Arena: ASCII art13521205Claude Opus 5
LiveBench design83.0%Not measuredOnly Claude Opus 5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index220
General benchmarks for Claude Opus 5 and Claude Sonnet 4.5
BenchmarkClaude Opus 5Claude Sonnet 4.5Leader
LiveBench data analysis74.6%Not measuredOnly Claude Opus 5 measured
Public Benefits Bench (Vals AI)76.9%Not measuredOnly Claude Opus 5 measured
SAGE (Vals AI)49.4%36.1%Claude Opus 5
MedScribe (Vals AI)91.0%84.5%Claude Opus 5
Vals Multimodal Index73.9%Not measuredOnly Claude Opus 5 measured
Long context reasoning (AA-LCR)82.0%Not measuredOnly Claude Opus 5 measured
DTBench97.9%83.2%Claude Opus 5
LMCA64.5%38.8%Claude Opus 5
Furniture assembly60.8%Not measuredOnly Claude Opus 5 measured
LMArena Text15091438Claude Opus 5
LMArena Text: instruction following15181459Claude Opus 5
LMArena Text: creative writing14931442Claude Opus 5
LMArena Vision1320Not measuredOnly Claude Opus 5 measured
LMArena Text: English15081450Claude Opus 5
LMArena Text: non-English15021425Claude Opus 5
LMArena Text: Chinese15731460Claude Opus 5
LMArena Text: German15271427Claude Opus 5
LMArena Text: Japanese15201390Claude Opus 5
LMArena Text: Korean15171402Claude Opus 5
LMArena Text: French15191459Claude Opus 5
LMArena Text: Spanish15231458Claude Opus 5
LMArena Text: Russian15071437Claude Opus 5
LMArena Text: Polish15221423Claude Opus 5
LMArena Text: multi-turn15001465Claude Opus 5
LMArena Text: longer queries15171475Claude Opus 5
LMArena Text: writing and language14991442Claude Opus 5
LMArena Text: entertainment and media14811428Claude Opus 5
LMArena Vision: English1315Not measuredOnly Claude Opus 5 measured
LMArena Vision: Chinese1400Not measuredOnly Claude Opus 5 measured
LMArena Vision: reading text1329Not measuredOnly Claude Opus 5 measured
LMArena Vision: humor1293Not measuredOnly Claude Opus 5 measured
LMArena Vision: creative writing1313Not measuredOnly Claude Opus 5 measured
LMArena Document15161450Claude Opus 5
Neither model has a result on the other 13 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 5 and Claude Sonnet 4.5
BenchmarkClaude Opus 5Claude Sonnet 4.5Leader
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 5$0.018Fits in one request
Claude Sonnet 4.5$0.011Fits in one request

Claude Sonnet 4.5 costs less

Repository review

50K input + 3K output tokens

Claude Opus 5$0.325Fits in one request
Claude Sonnet 4.5$0.195Fits in one request

Claude Sonnet 4.5 costs less

Agent loop

200K input + 10K output tokens

Claude Opus 5$1.25Fits in one request
Claude Sonnet 4.5$0.750Fits in one request

Claude Sonnet 4.5 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 5 and Claude Sonnet 4.5
SpecificationAnthropic Claude Opus 5Anthropic Claude Sonnet 4.5
MakerAnthropicAnthropic
WeightsNo public weights listedNo public weights listed
ReleasedJuly 24, 2026September 29, 2025
Context window1M1M
Input $/Mtok$5.00$3.00
Output $/Mtok$25.00$15.00
Coding index83.039.5
Independent measurements behind it63
Cost per solved task$1.33$1.16
SourceOpenRouter listingOpenRouter listing

Questions

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

Pick Claude Opus 5 for coding: it scores 83.0 on the Vibe Coding Index against 39.5 for Claude Sonnet 4.5. Pick Claude Sonnet 4.5 for output tokens 1.7x cheaper ($15.00 vs $25.00 per million) and a lower cost per solved task ($1.16 against $1.33).

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

Claude Opus 5 costs $5.00 per million input tokens and $25.00 per million output tokens; Claude Sonnet 4.5 costs $3.00 and $15.00. Per solved SWE-bench Verified task, Claude Opus 5 costs $1.33 and Claude Sonnet 4.5 $1.16.

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

Neither: both take 1M tokens.

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

76 benchmarks have a result for both models as of October 22, 2026. Claude Opus 5's coding index rests on 6 independent benchmarks and Claude Sonnet 4.5's on 3. 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-5-vs-claude-sonnet-4-5">LLMBenchmark.ai, Claude Opus 5 vs Claude Sonnet 4.5</a></p>