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Claude Opus 5 vs Claude Opus 5.5

Claude Opus 5.5 leads Claude Opus 5 on coding, 88.8 to 83.0 on the Vibe Coding Index, and Claude Opus 5.5 costs 1.3x less per output token ($20.00 vs $25.00 per million). Updated October 22, 2026; 100 benchmarks have a result for both.

Replace Claude Opus 5 Replace Claude Opus 5.5
Claude Opus 5Anthropic
Coding
83.0
Overall
81.6
Output $/M
$25.00
23
Claude Opus 5.5Anthropic
Coding
88.8
Overall
87.1
Output $/M
$20.00
76
vs boards won of 100 shared, 1 tied

Claude Opus 5 or Claude Opus 5.5: which to pick

Pick Claude Opus 5.5 for coding: it scores 88.8 on the Vibe Coding Index against 83.0 for Claude Opus 5, though on 5 benchmarks against 6.

Pick Claude Opus 5 for work measured by ALE-Bench or Design Arena: agents building mobile apps, where it leads.

Model AClaude Opus 5Anthropic83.0/1006 independent benchmarks$1.33 per solved taskModel BClaude Opus 5.5Anthropic88.8/1005 independent benchmarksNo cost per solved task
Shared results
100
Claude Opus 5 only
31
Claude Opus 5.5 only
9
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 Opus 5.5 88.8 from 5 benchmarks.
Widest category
Agentic work, 11.3 points apart on average over 18 shared benchmarks.
Widest single gap
Time Horizon Index (Vals AI): Claude Opus 5 18.8% against Claude Opus 5.5 91.3%, 72.5 points apart on a 0 to 100 scale.
Output price
Claude Opus 5 $25.00 against Claude Opus 5.5 $20.00 per million output tokens, 1.3x 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 Opus 5.5Ties
Coding119
Intelligence02
Agentic work7101 tie
Reasoning311
Math24
Knowledge51
Web design08
General521
All shared boards23761 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index119
Coding benchmarks for Claude Opus 5 and Claude Opus 5.5
BenchmarkClaude Opus 5Claude Opus 5.5Leader
LiveBench coding90.8%96.3%Claude Opus 5.5
LMArena WebDev16891807Claude Opus 5.5
AA Coding Index78.0Not measuredOnly Claude Opus 5 measured
LiveCodeBench (Vals AI)89.0%Not measuredOnly Claude Opus 5 measured
SWE-bench Verified (Vals AI)97.0%Not measuredOnly Claude Opus 5 measured
Terminal-Bench 4 (Vals AI)53.5%65.2%Claude Opus 5.5
Vibe Code Bench (Vals AI)88.4%90.3%Claude Opus 5.5
Code migration (Vals AI)57.5%66.7%Claude Opus 5.5
ProgramBench (Vals AI)3.0%18.5%Claude Opus 5.5
IOI (Vals AI)84.3%95.1%Claude Opus 5.5
Terminal-Bench 2.1 (Vals AI)84.6%87.6%Claude Opus 5.5
SWE-bench Multimodal (Vals AI)Not measured70.2%Only Claude Opus 5.5 measured
Vibe Code Bench 1-100 (Vals AI)28.5%30.4%Claude Opus 5.5
SkillsBench (Vals AI)60.4%Not measuredOnly Claude Opus 5 measured
CyberBench (Vals AI)65.4%74.6%Claude Opus 5.5
SciCode56.4%66.9%Claude Opus 5.5
FrontierCode53.4%54.6%Claude Opus 5.5
FrontierSWE52.0%62.3%Claude Opus 5.5
WeirdML91.8%Not measuredOnly Claude Opus 5 measured
MirrorCodeNot measured77.4%Only Claude Opus 5.5 measured
ALE-Bench2164.62147.4Claude Opus 5
LMArena Text: coding15331545Claude Opus 5.5
LMArena Text: software and IT15271538Claude Opus 5.5
LMArena WebDev: React17111855Claude Opus 5.5
LMArena WebDev: HTML16801753Claude Opus 5.5
LMArena WebDev: from an image16621753Claude Opus 5.5
SciCode13.8%18.5%Claude Opus 5.5
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 5 and Claude Opus 5.5
BenchmarkClaude Opus 5Claude Opus 5.5Leader
AA Intelligence Index50.857.6Claude Opus 5.5
Epoch Capabilities Index163.9168.8Claude Opus 5.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index710
Agentic work benchmarks for Claude Opus 5 and Claude Opus 5.5
BenchmarkClaude Opus 5Claude Opus 5.5Leader
AA Agentic Index56.5Not measuredOnly Claude Opus 5 measured
Design Arena: agents building web apps12661316Claude Opus 5.5
Design Arena: agents building full-stack apps1306Not measuredOnly Claude Opus 5 measured
Design Arena: agents building mobile apps13481308Claude 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
Design Arena: spreadsheetsNot measured1368Only Claude Opus 5.5 measured
LiveBench research88.9%85.0%Claude Opus 5
LiveBench browser84.0%80.0%Claude Opus 5
LiveBench long agentic62.1%85.0%Claude Opus 5.5
SREBench (Vals AI)12.2%33.6%Claude Opus 5.5
Finance Agent (Vals AI)58.6%58.6%Claude Opus 5
Tax Agent Bench (Vals AI)45.5%45.6%Claude Opus 5.5
Legal Research Bench (Vals AI)55.3%50.5%Claude Opus 5
Harvey's Legal Agent Benchmark (Vals AI)Not measured9.2%Only Claude Opus 5.5 measured
Excel Modeling Benchmark (Vals AI)73.6%75.9%Claude Opus 5.5
BioMysteryBench (Vals AI)79.3%79.3%Tie
Terminal-Bench-Science (Vals AI)27.1%47.1%Claude Opus 5.5
Vals Science Index47.9%58.7%Claude Opus 5.5
Time Horizon Index (Vals AI)18.8%91.3%Claude Opus 5.5
CUA-bench (Vals AI)9.0%14.0%Claude Opus 5.5
Robo-bench (Vals AI)Not measured14.6%Only Claude Opus 5.5 measured
APEX-Agents65.8%73.5%Claude Opus 5.5
Remote Labor IndexNot measured21.3%Only Claude Opus 5.5 measured
OSWorld 2.031.4%Not measuredOnly Claude Opus 5 measured
BALROG63.4%Not measuredOnly Claude Opus 5 measured
PostTrainBench35.0%Not measuredOnly Claude Opus 5 measured
SpireClimbNot measured3.3%Only Claude Opus 5.5 measured
Vending-Bench 2$11,182$9,235Claude Opus 5
LMArena Search12421213Claude Opus 5
Neither model has a result on the other 9 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index311
Reasoning benchmarks for Claude Opus 5 and Claude Opus 5.5
BenchmarkClaude Opus 5Claude Opus 5.5Leader
GPQA Diamond93.4%Not measuredOnly Claude Opus 5 measured
LiveBench reasoning91.2%92.2%Claude Opus 5.5
MysteryMechanism (Vals AI)37.4%49.5%Claude Opus 5.5
MMMU Pro (Vals AI)89.9%Not measuredOnly Claude Opus 5 measured
GPQA Diamond (Artificial Analysis run)93.7%Not measuredOnly Claude Opus 5 measured
Humanity's Last Exam (Artificial Analysis run)54.9%61.4%Claude Opus 5.5
GPQA Diamond (Epoch AI run)93.9%90.6%Claude Opus 5
ARC-AGI97.5%98.5%Claude Opus 5.5
ARC-AGI-290.4%93.3%Claude Opus 5.5
SimpleBench80.6%Not measuredOnly Claude Opus 5 measured
Chess puzzles43.0%67.0%Claude Opus 5.5
Mystery game puzzles59.0%71.0%Claude Opus 5.5
EBR-bench45.7%71.4%Claude Opus 5.5
LMArena Text: hard prompts15271536Claude Opus 5.5
LMArena Text: expert15541549Claude Opus 5
LMArena Text: hard prompts in English15231535Claude Opus 5.5
LMArena Vision: diagrams13481345Claude Opus 5
LMArena Vision: homework13381362Claude Opus 5.5
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index24
Math benchmarks for Claude Opus 5 and Claude Opus 5.5
BenchmarkClaude Opus 5Claude Opus 5.5Leader
OTIS Mock AIME98.9%100.0%Claude Opus 5.5
FrontierMath, tiers 1 to 385.6%91.2%Claude Opus 5.5
FrontierMath, tier 473.2%95.0%Claude Opus 5.5
ProofBench99.0%100.0%Claude Opus 5.5
LMArena Text: math15331518Claude Opus 5
LMArena Text: mathematical work15441516Claude Opus 5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index51
Knowledge benchmarks for Claude Opus 5 and Claude Opus 5.5
BenchmarkClaude Opus 5Claude Opus 5.5Leader
MMLU Pro91.6%Not measuredOnly Claude Opus 5 measured
LegalBench (Vals AI)87.0%Not measuredOnly Claude Opus 5 measured
CorpFin (Vals AI)73.2%Not measuredOnly Claude Opus 5 measured
TaxEval (Vals AI)75.1%Not measuredOnly Claude Opus 5 measured
MortgageTax (Vals AI)72.1%Not measuredOnly Claude Opus 5 measured
MedCode (Vals AI)63.6%49.8%Claude Opus 5
SimpleQA Verified59.9%72.2%Claude Opus 5.5
LMArena Text: science15311524Claude Opus 5
LMArena Text: medicine and healthcare15251509Claude Opus 5
LMArena Text: legal and government15301518Claude Opus 5
LMArena Text: business and finance15011494Claude Opus 5
FACTS Benchmark SuiteNot measured65.3%Only Claude Opus 5.5 measured
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index08
Web design benchmarks for Claude Opus 5 and Claude Opus 5.5
BenchmarkClaude Opus 5Claude Opus 5.5Leader
Design Arena: websites13091335Claude Opus 5.5
Design Arena: UI components13461385Claude Opus 5.5
Design Arena: game dev13371461Claude Opus 5.5
Design Arena: data viz13291397Claude Opus 5.5
Design Arena: 3D13341476Claude Opus 5.5
Design Arena: all code categories13231390Claude Opus 5.5
Design Arena: SVG13111329Claude Opus 5.5
Design Arena: ASCII art1352Not measuredOnly Claude Opus 5 measured
LiveBench design83.0%86.9%Claude Opus 5.5
GeneralLike-for-likePublic boards, shown as published, kept out of the index521
General benchmarks for Claude Opus 5 and Claude Opus 5.5
BenchmarkClaude Opus 5Claude Opus 5.5Leader
Vals IndexNot measured70.2%Only Claude Opus 5.5 measured
LiveBench data analysis74.6%80.3%Claude Opus 5.5
Public Benefits Bench (Vals AI)76.9%70.6%Claude Opus 5
SAGE (Vals AI)49.4%45.8%Claude Opus 5
MedScribe (Vals AI)91.0%91.4%Claude Opus 5.5
Vals Multimodal Index73.9%Not measuredOnly Claude Opus 5 measured
Long context reasoning (AA-LCR)82.0%84.7%Claude Opus 5.5
DTBench97.9%98.9%Claude Opus 5.5
LMCA64.5%68.2%Claude Opus 5.5
Furniture assembly60.8%83.3%Claude Opus 5.5
LMArena Text15091516Claude Opus 5.5
LMArena Text: instruction following15181537Claude Opus 5.5
LMArena Text: creative writing14931535Claude Opus 5.5
LMArena Vision13201321Claude Opus 5.5
LMArena Text: English15081519Claude Opus 5.5
LMArena Text: non-English15021507Claude Opus 5.5
LMArena Text: Chinese15731582Claude Opus 5.5
LMArena Text: German1527Not measuredOnly Claude Opus 5 measured
LMArena Text: Japanese15201534Claude Opus 5.5
LMArena Text: Korean1517Not measuredOnly Claude Opus 5 measured
LMArena Text: French15191493Claude Opus 5
LMArena Text: Spanish15231508Claude Opus 5
LMArena Text: Russian15071517Claude Opus 5.5
LMArena Text: Polish1522Not measuredOnly Claude Opus 5 measured
LMArena Text: multi-turn15001501Claude Opus 5.5
LMArena Text: longer queries15171532Claude Opus 5.5
LMArena Text: writing and language14991532Claude Opus 5.5
LMArena Text: entertainment and media14811515Claude Opus 5.5
LMArena Vision: English13151317Claude Opus 5.5
LMArena Vision: Chinese1400Not measuredOnly Claude Opus 5 measured
LMArena Vision: reading text13291326Claude Opus 5
LMArena Vision: humor1293Not measuredOnly Claude Opus 5 measured
LMArena Vision: creative writing13131320Claude Opus 5.5
LMArena Document1516Not measuredOnly Claude Opus 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 5 and Claude Opus 5.5
BenchmarkClaude Opus 5Claude Opus 5.5Leader
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 Opus 5.5$0.014Fits in one request

Claude Opus 5.5 costs less

Repository review

50K input + 3K output tokens

Claude Opus 5$0.325Fits 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 5$1.25Fits in one request
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.

Specifications of Claude Opus 5 and Claude Opus 5.5
SpecificationAnthropic Claude Opus 5Anthropic Claude Opus 5.5
MakerAnthropicAnthropic
WeightsNo public weights listedNo public weights listed
ReleasedJuly 24, 2026September 22, 2026
Context window1M1M
Input $/Mtok$5.00$4.00
Output $/Mtok$25.00$20.00
Coding index83.088.8
Independent measurements behind it65
Cost per solved task$1.33Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 5 better than Claude Opus 5.5 for coding?

Pick Claude Opus 5.5 for coding: it scores 88.8 on the Vibe Coding Index against 83.0 for Claude Opus 5, though on 5 benchmarks against 6. Pick Claude Opus 5 for work measured by ALE-Bench or Design Arena: agents building mobile apps, where it leads.

Which is cheaper, Claude Opus 5 or Claude Opus 5.5?

Claude Opus 5 costs $5.00 per million input tokens and $25.00 per million output tokens; Claude Opus 5.5 costs $4.00 and $20.00. Cost per solved task is known for Claude Opus 5 only.

Which has the bigger context window, Claude Opus 5 or Claude Opus 5.5?

Neither: both take 1M tokens.

How many benchmarks is the Claude Opus 5 vs Claude Opus 5.5 comparison based on?

100 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 Opus 5.5's on 5. 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-opus-5-5">LLMBenchmark.ai, Claude Opus 5 vs Claude Opus 5.5</a></p>