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Claude Opus 4.5 vs o4 Mini

Claude Opus 4.5 leads o4 Mini on the Artificial Analysis Intelligence Index, 29.1 to 16.7, and o4 Mini costs 5.7x less per output token ($4.40 vs $25.00 per million). Updated October 22, 2026; 84 benchmarks have a result for both.

Replace Claude Opus 4.5 Replace o4 Mini
Claude Opus 4.5Anthropic
Coding
44.0
Overall
55.7
Output $/M
$25.00
78
o4 MiniOpenAI
Coding
No data
Overall
43.0
Output $/M
$4.40
5
vs boards won of 84 shared, 1 tied

Claude Opus 4.5 or o4 Mini: which to pick

Only Claude Opus 4.5 has a coding score, 44.0 on the Vibe Coding Index; o4 Mini has none, so the two cannot be ranked on coding.

Pick o4 Mini for output tokens 5.7x cheaper ($4.40 vs $25.00 per million) and work measured by Chess puzzles or VPCT, where it leads.

Model AClaude Opus 4.5Anthropic44.0/1003 independent benchmarks$1.37 per solved taskModel Bo4 MiniOpenAINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
84
Claude Opus 4.5 only
28
o4 Mini only
18
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, o4 Mini not benchmarked.
Widest category
Web design, 33.7 points apart on average over 6 shared benchmarks.
Widest single gap
Design Arena: 3D: Claude Opus 4.5 1213 against o4 Mini 854, 44.9 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.5 $25.00 against o4 Mini $4.40 per million output tokens, 5.7x apart.
Context window
Both take 200K 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 4.5Barso4 MiniTies
Coding80
Intelligence20
Agentic work30
Reasoning132
Math711 tie
Knowledge161
Web design60
General231
All shared boards7851 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index80
Coding benchmarks for Claude Opus 4.5 and o4 Mini
BenchmarkClaude Opus 4.5o4 MiniLeader
Aider polyglotNot measured72.0%Only o4 Mini measured
SWE-bench Verified79.2%64.6%Claude Opus 4.5
SWE-bench (full test set)52.6%Not measuredOnly Claude Opus 4.5 measured
SWE-bench MultimodalNot measured33.9%Only o4 Mini measured
SWE-bench Multilingual70.7%Not measuredOnly Claude Opus 4.5 measured
LMArena WebDev1494Not measuredOnly Claude Opus 4.5 measured
LiveCodeBench (Vals AI)83.7%82.2%Claude Opus 4.5
SWE-bench Verified (Vals AI)76.4%Not measuredOnly Claude Opus 4.5 measured
Vibe Code Bench (Vals AI)20.6%Not measuredOnly Claude Opus 4.5 measured
LiveCodeBench (Artificial Analysis run)87.1%85.9%Claude Opus 4.5
Terminal-Bench Hard (Artificial Analysis run)47.0%15.2%Claude Opus 4.5
Terminal-Bench63.1%Not measuredOnly Claude Opus 4.5 measured
GSO-Bench26.5%3.6%Claude Opus 4.5
WeirdML63.7%52.6%Claude Opus 4.5
Cybench82.0%Not measuredOnly Claude Opus 4.5 measured
LMArena Text: coding15031368Claude Opus 4.5
LMArena Text: software and IT14831367Claude Opus 4.5
LMArena WebDev: React1478Not measuredOnly Claude Opus 4.5 measured
LMArena WebDev: HTML1510Not measuredOnly Claude Opus 4.5 measured
SciCodeNot measured10.8%Only o4 Mini measured
Neither model has a result on the other 23 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 4.5 and o4 Mini
BenchmarkClaude Opus 4.5o4 MiniLeader
AA Intelligence Index29.116.7Claude Opus 4.5
Epoch Capabilities Index150.1145.5Claude Opus 4.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index30
Agentic work benchmarks for Claude Opus 4.5 and o4 Mini
BenchmarkClaude Opus 4.5o4 MiniLeader
Design Arena: agents building web apps1159Not measuredOnly Claude Opus 4.5 measured
Design Arena: agents building full-stack apps1156Not measuredOnly Claude Opus 4.5 measured
Design Arena: agents building mobile apps1188Not measuredOnly Claude Opus 4.5 measured
Design Arena: agents building Android apps1176Not measuredOnly Claude Opus 4.5 measured
τ²-Bench Telecom89.5%55.6%Claude Opus 4.5
METR time horizons75.0%63.9%Claude Opus 4.5
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$4,967Not measuredOnly Claude Opus 4.5 measured
Berkeley Function Calling Leaderboard (BFCL)77.5%53.2%Claude Opus 4.5
MCP Atlas69.8%Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 28 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index132
Reasoning benchmarks for Claude Opus 4.5 and o4 Mini
BenchmarkClaude Opus 4.5o4 MiniLeader
GPQA Diamond85.9%74.5%Claude Opus 4.5
MMMU Pro (Vals AI)83.0%79.7%Claude Opus 4.5
GPQA Diamond (Artificial Analysis run)86.6%78.4%Claude Opus 4.5
Humanity's Last Exam (Artificial Analysis run)30.1%16.5%Claude Opus 4.5
GPQA Diamond (Epoch AI run)86.0%79.6%Claude Opus 4.5
ARC-AGI80.0%58.7%Claude Opus 4.5
ARC-AGI-237.6%6.1%Claude Opus 4.5
SimpleBench62.0%38.7%Claude Opus 4.5
Chess puzzles14.0%22.0%o4 Mini
Mystery game puzzles22.0%5.0%Claude Opus 4.5
EBR-bench14.3%Not measuredOnly Claude Opus 4.5 measured
VPCT40.0%57.5%o4 Mini
LMArena Text: hard prompts14761351Claude Opus 4.5
LMArena Text: expert14871343Claude Opus 4.5
LMArena Text: hard prompts in English14821366Claude Opus 4.5
LMArena Vision: diagramsNot measured1197Only o4 Mini measured
LMArena Vision: homeworkNot measured1234Only o4 Mini measured
Kagi LLM Benchmark80.2%67.6%Claude Opus 4.5
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index71
Math benchmarks for Claude Opus 4.5 and o4 Mini
BenchmarkClaude Opus 4.5o4 MiniLeader
AIME95.4%83.7%Claude Opus 4.5
MATH 500 (Vals AI)Not measured94.2%Only o4 Mini measured
MGSM (Vals AI)95.2%93.4%Claude Opus 4.5
AA Math Index91.390.7Claude Opus 4.5
AIME 2025 (Artificial Analysis run)91.3%90.7%Claude Opus 4.5
OTIS Mock AIME86.1%81.7%Claude Opus 4.5
FrontierMath, tiers 1 to 334.4%36.1%o4 Mini
FrontierMath, tier 44.9%4.9%Tie
ProofBench36.0%Not measuredOnly Claude Opus 4.5 measured
MATH level 5Not measured97.8%Only o4 Mini measured
LMArena Text: math14631389Claude Opus 4.5
LMArena Text: mathematical work14681379Claude Opus 4.5
MathArenaNot measured14.8%Only o4 Mini measured
Neither model has a result on the other 1 board here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index161
Knowledge benchmarks for Claude Opus 4.5 and o4 Mini
BenchmarkClaude Opus 4.5o4 MiniLeader
MMLU Pro87.3%80.6%Claude Opus 4.5
LegalBench (Vals AI)84.6%79.2%Claude Opus 4.5
CaseLaw (Vals AI)62.6%Not measuredOnly Claude Opus 4.5 measured
CorpFin (Vals AI)65.1%59.0%Claude Opus 4.5
TaxEval (Vals AI)74.9%74.8%Claude Opus 4.5
MortgageTax (Vals AI)68.7%64.8%Claude Opus 4.5
MedQA (Vals AI)95.9%96.0%o4 Mini
MedCode (Vals AI)49.2%33.8%Claude Opus 4.5
MMLU Pro (Artificial Analysis run)89.5%83.2%Claude Opus 4.5
SimpleQA Verified45.7%19.6%Claude Opus 4.5
GeoBench75.0%64.0%Claude Opus 4.5
LMArena Text: science14541354Claude Opus 4.5
LMArena Text: medicine and healthcare14441361Claude Opus 4.5
LMArena Text: legal and government14591350Claude Opus 4.5
LMArena Text: business and finance14481325Claude Opus 4.5
FACTS Benchmark Suite43.9%28.1%Claude Opus 4.5
PRBench Finance46.2%39.2%Claude Opus 4.5
PRBench Legal44.2%38.1%Claude Opus 4.5
Neither model has a result on the other 2 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index60
Web design benchmarks for Claude Opus 4.5 and o4 Mini
BenchmarkClaude Opus 4.5o4 MiniLeader
Design Arena: websites1247985Claude Opus 4.5
Design Arena: UI components1236981Claude Opus 4.5
Design Arena: game dev12281003Claude Opus 4.5
Design Arena: data viz1243991Claude Opus 4.5
Design Arena: 3D1213854Claude Opus 4.5
Design Arena: all code categories1241976Claude Opus 4.5
Design Arena: SVG1180Not measuredOnly Claude Opus 4.5 measured
Design Arena: ASCII art1190Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index231
General benchmarks for Claude Opus 4.5 and o4 Mini
BenchmarkClaude Opus 4.5o4 MiniLeader
SAGE (Vals AI)52.1%41.1%Claude Opus 4.5
MedScribe (Vals AI)85.3%69.1%Claude Opus 4.5
IFBench58.0%68.7%o4 Mini
Long context reasoning (AA-LCR)77.3%61.0%Claude Opus 4.5
DTBench89.9%77.6%Claude Opus 4.5
LMCA44.5%26.5%Claude Opus 4.5
Fiction.LiveBenchNot measured77.8%Only o4 Mini measured
Creative writing (Lech Mazur)Not measured75.0%Only o4 Mini measured
CL-bench21.1%Not measuredOnly Claude Opus 4.5 measured
Furniture assembly28.3%Not measuredOnly Claude Opus 4.5 measured
LMArena Text14511353Claude Opus 4.5
LMArena Text: instruction following14781320Claude Opus 4.5
LMArena Text: creative writing14451294Claude Opus 4.5
LMArena VisionNot measured1194Only o4 Mini measured
LMArena Text: English14611367Claude Opus 4.5
LMArena Text: non-English14381337Claude Opus 4.5
LMArena Text: Chinese14701354Claude Opus 4.5
LMArena Text: German14491336Claude Opus 4.5
LMArena Text: Japanese14171308Claude Opus 4.5
LMArena Text: Korean14241312Claude Opus 4.5
LMArena Text: French14711364Claude Opus 4.5
LMArena Text: Spanish14571346Claude Opus 4.5
LMArena Text: Russian14471334Claude Opus 4.5
LMArena Text: Polish14391358Claude Opus 4.5
LMArena Text: multi-turn14661350Claude Opus 4.5
LMArena Text: longer queries14791315Claude Opus 4.5
LMArena Text: writing and language14521316Claude Opus 4.5
LMArena Text: entertainment and media14341308Claude Opus 4.5
LMArena Vision: EnglishNot measured1200Only o4 Mini measured
LMArena Vision: ChineseNot measured1218Only o4 Mini measured
LMArena Vision: reading textNot measured1197Only o4 Mini measured
LMArena Vision: humorNot measured1199Only o4 Mini measured
LMArena Vision: captioningNot measured1204Only o4 Mini measured
LMArena Vision: recognizing thingsNot measured1218Only o4 Mini measured
LMArena Vision: creative writingNot measured1166Only o4 Mini measured
LMArena Document1462Not measuredOnly Claude Opus 4.5 measured
MultiChallenge59.0%44.9%Claude Opus 4.5
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
Image generation benchmarks for Claude Opus 4.5 and o4 Mini
BenchmarkClaude Opus 4.5o4 MiniLeader
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
o4 Mini$0.0033Fits in one request

o4 Mini costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.5$0.325Fits in one request
o4 Mini$0.068Fits in one request

o4 Mini costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.5$1.25Exceeds the context window
o4 Mini$0.264Exceeds the context window

o4 Mini 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 o4 Mini
SpecificationAnthropic Claude Opus 4.5OpenAI o4 Mini
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedNovember 24, 2025April 16, 2025
Context window200K200K
Input $/Mtok$5.00$1.10
Output $/Mtok$25.00$4.40
Coding index44.0Not benchmarked
Independent measurements behind it30
Cost per solved task$1.37Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.5 better than o4 Mini for coding?

Only Claude Opus 4.5 has a coding score, 44.0 on the Vibe Coding Index; o4 Mini has none, so the two cannot be ranked on coding. Pick o4 Mini for output tokens 5.7x cheaper ($4.40 vs $25.00 per million) and work measured by Chess puzzles or VPCT, where it leads.

Which is cheaper, Claude Opus 4.5 or o4 Mini?

Claude Opus 4.5 costs $5.00 per million input tokens and $25.00 per million output tokens; o4 Mini costs $1.10 and $4.40. Cost per solved task is known for Claude Opus 4.5 only.

Which has the bigger context window, Claude Opus 4.5 or o4 Mini?

Neither: both take 200K tokens.

How many benchmarks is the Claude Opus 4.5 vs o4 Mini comparison based on?

84 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 o4 Mini's on 0. Where only one model has a result, the page says so instead of naming a winner.

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