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Claude Opus 4.5 vs GPT-5 Mini

Claude Opus 4.5 leads GPT-5 Mini on coding, 44.0 to 34.2 on the Vibe Coding Index, and GPT-5 Mini costs 12.5x less per output token ($2.00 vs $25.00 per million). Updated October 21, 2026; 86 benchmarks have a result for both.

Replace Claude Opus 4.5 Replace GPT-5 Mini
Claude Opus 4.5Anthropic
Coding
44.0
Overall
55.7
Output $/M
$25.00
76
GPT-5 MiniOpenAI
Coding
34.2
Overall
43.7
Output $/M
$2.00
10
vs boards won of 86 shared

Claude Opus 4.5 or GPT-5 Mini: which to pick

Pick Claude Opus 4.5 for coding: it scores 44.0 on the Vibe Coding Index against 34.2 for GPT-5 Mini.

Pick GPT-5 Mini for output tokens 12.5x cheaper ($2.00 vs $25.00 per million) and a lower cost per solved task ($0.08 against $1.37).

Model AClaude Opus 4.5Anthropic44.0/1003 independent benchmarks$1.37 per solved taskModel BGPT-5 MiniOpenAI34.2/1002 independent benchmarks$0.08 per solved task
Shared results
86
Claude Opus 4.5 only
22
GPT-5 Mini only
15
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, GPT-5 Mini 34.2 from 2 benchmarks.
Widest category
Agentic work, 23.8 points apart on average over 3 shared benchmarks.
Widest single gap
ARC-AGI-2: Claude Opus 4.5 37.6% against GPT-5 Mini 4.4%, 33.2 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.5 $25.00 against GPT-5 Mini $2.00 per million output tokens, 12.5x apart.
Context window
Claude Opus 4.5 takes 200K tokens, GPT-5 Mini 400K.

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 4.5BarsGPT-5 MiniTies
Coding101
Intelligence20
Agentic work30
Reasoning122
Math73
Knowledge123
Web design80
General221
All shared boards7610
CodingLike-for-likeSix of these boards feed the Vibe Coding Index101
Coding benchmarks for Claude Opus 4.5 and GPT-5 Mini
BenchmarkClaude Opus 4.5GPT-5 MiniLeader
SWE-bench Verified79.2%59.8%Claude Opus 4.5
SWE-bench (full test set)52.6%Not measuredOnly Claude Opus 4.5 measured
SWE-bench Multilingual70.7%39.7%Claude Opus 4.5
LMArena WebDev1494Not measuredOnly Claude Opus 4.5 measured
LiveCodeBench (Vals AI)83.7%86.6%GPT-5 Mini
SWE-bench Verified (Vals AI)76.4%60.8%Claude Opus 4.5
Vibe Code Bench (Vals AI)20.6%14.2%Claude Opus 4.5
LiveCodeBench (Artificial Analysis run)87.1%83.8%Claude Opus 4.5
SciCodeNot measured39.0%Only GPT-5 Mini measured
Terminal-Bench Hard (Artificial Analysis run)47.0%33.3%Claude Opus 4.5
Terminal-Bench63.1%34.8%Claude Opus 4.5
GSO-Bench26.5%Not measuredOnly Claude Opus 4.5 measured
WeirdML63.7%52.7%Claude Opus 4.5
Cybench82.0%Not measuredOnly Claude Opus 4.5 measured
LMArena Text: coding15031406Claude Opus 4.5
LMArena Text: software and IT14831394Claude Opus 4.5
LMArena WebDev: React1478Not measuredOnly Claude Opus 4.5 measured
LMArena WebDev: HTML1510Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 21 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 4.5 and GPT-5 Mini
BenchmarkClaude Opus 4.5GPT-5 MiniLeader
AA Intelligence Index29.120.6Claude Opus 4.5
Epoch Capabilities Index150.1145.3Claude 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 GPT-5 Mini
BenchmarkClaude Opus 4.5GPT-5 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 apps1189Not measuredOnly Claude Opus 4.5 measured
Design Arena: agents building Android apps1175Not measuredOnly Claude Opus 4.5 measured
τ²-Bench Telecom89.5%71.1%Claude Opus 4.5
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-$31Claude Opus 4.5
Berkeley Function Calling Leaderboard (BFCL)77.5%55.5%Claude Opus 4.5
Neither model has a result on the other 28 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index122
Reasoning benchmarks for Claude Opus 4.5 and GPT-5 Mini
BenchmarkClaude Opus 4.5GPT-5 MiniLeader
GPQA Diamond85.9%80.3%Claude Opus 4.5
MMMU Pro (Vals AI)83.0%78.9%Claude Opus 4.5
GPQA Diamond (Artificial Analysis run)86.6%82.8%Claude Opus 4.5
Humanity's Last Exam (Artificial Analysis run)30.1%21.5%Claude Opus 4.5
GPQA Diamond (Epoch AI run)86.0%75.0%Claude Opus 4.5
ARC-AGI80.0%54.3%Claude Opus 4.5
ARC-AGI-237.6%4.4%Claude Opus 4.5
SimpleBench62.0%Not measuredOnly Claude Opus 4.5 measured
Chess puzzles14.0%24.0%GPT-5 Mini
Mystery game puzzles22.0%10.0%Claude Opus 4.5
EBR-bench14.3%Not measuredOnly Claude Opus 4.5 measured
VPCT40.0%40.2%GPT-5 Mini
LMArena Text: hard prompts14761380Claude Opus 4.5
LMArena Text: expert14871379Claude Opus 4.5
LMArena Text: hard prompts in English14821383Claude Opus 4.5
LMArena Vision: diagramsNot measured1202Only GPT-5 Mini measured
LMArena Vision: homeworkNot measured1210Only GPT-5 Mini measured
Kagi LLM Benchmark80.2%70.3%Claude Opus 4.5
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index73
Math benchmarks for Claude Opus 4.5 and GPT-5 Mini
BenchmarkClaude Opus 4.5GPT-5 MiniLeader
AIME95.4%91.5%Claude Opus 4.5
MATH 500 (Vals AI)Not measured94.8%Only GPT-5 Mini measured
MGSM (Vals AI)95.2%92.6%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%86.7%GPT-5 Mini
FrontierMath, tiers 1 to 334.4%46.7%GPT-5 Mini
FrontierMath, tier 44.9%12.2%GPT-5 Mini
ProofBench36.0%9.0%Claude Opus 4.5
MATH level 5Not measured97.8%Only GPT-5 Mini measured
LMArena Text: math14631378Claude Opus 4.5
LMArena Text: mathematical work14681380Claude Opus 4.5
Neither model has a result on the other 1 board here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index123
Knowledge benchmarks for Claude Opus 4.5 and GPT-5 Mini
BenchmarkClaude Opus 4.5GPT-5 MiniLeader
MMLU Pro87.3%82.2%Claude Opus 4.5
LegalBench (Vals AI)84.6%81.8%Claude Opus 4.5
CaseLaw (Vals AI)62.6%68.5%GPT-5 Mini
CorpFin (Vals AI)65.1%60.2%Claude Opus 4.5
TaxEval (Vals AI)74.9%75.2%GPT-5 Mini
MortgageTax (Vals AI)68.7%66.9%Claude Opus 4.5
MedQA (Vals AI)95.9%96.1%GPT-5 Mini
MedCode (Vals AI)49.2%43.0%Claude Opus 4.5
MMLU Pro (Artificial Analysis run)89.5%83.7%Claude Opus 4.5
SimpleQA Verified45.7%21.6%Claude Opus 4.5
GeoBench75.0%Not measuredOnly Claude Opus 4.5 measured
LMArena Text: science14541371Claude Opus 4.5
LMArena Text: medicine and healthcare14441380Claude Opus 4.5
LMArena Text: legal and government14591375Claude Opus 4.5
LMArena Text: business and finance14481358Claude Opus 4.5
FACTS Benchmark Suite43.9%38.6%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 index80
Web design benchmarks for Claude Opus 4.5 and GPT-5 Mini
BenchmarkClaude Opus 4.5GPT-5 MiniLeader
Design Arena: websites12471125Claude Opus 4.5
Design Arena: UI components12381106Claude Opus 4.5
Design Arena: game dev12291130Claude Opus 4.5
Design Arena: data viz12431130Claude Opus 4.5
Design Arena: 3D12141037Claude Opus 4.5
Design Arena: all code categories12421115Claude Opus 4.5
Design Arena: SVG11811091Claude Opus 4.5
Design Arena: ASCII art11901125Claude Opus 4.5
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index221
General benchmarks for Claude Opus 4.5 and GPT-5 Mini
BenchmarkClaude Opus 4.5GPT-5 MiniLeader
SAGE (Vals AI)52.1%43.0%Claude Opus 4.5
MedScribe (Vals AI)85.3%80.6%Claude Opus 4.5
IFBench58.0%75.4%GPT-5 Mini
Long context reasoning (AA-LCR)77.3%72.3%Claude Opus 4.5
DTBench89.9%80.5%Claude Opus 4.5
LMCA44.5%34.2%Claude Opus 4.5
Fiction.LiveBenchNot measured69.4%Only GPT-5 Mini measured
Creative writing (Lech Mazur)Not measured83.1%Only GPT-5 Mini measured
CL-bench21.1%Not measuredOnly Claude Opus 4.5 measured
Furniture assembly28.3%Not measuredOnly Claude Opus 4.5 measured
LMArena Text14511373Claude Opus 4.5
LMArena Text: instruction following14781357Claude Opus 4.5
LMArena Text: creative writing14451325Claude Opus 4.5
LMArena VisionNot measured1202Only GPT-5 Mini measured
LMArena Text: English14611379Claude Opus 4.5
LMArena Text: non-English14381363Claude Opus 4.5
LMArena Text: Chinese14701386Claude Opus 4.5
LMArena Text: German14491366Claude Opus 4.5
LMArena Text: Japanese14171341Claude Opus 4.5
LMArena Text: Korean14241308Claude Opus 4.5
LMArena Text: French14711386Claude Opus 4.5
LMArena Text: Spanish14571354Claude Opus 4.5
LMArena Text: Russian14471362Claude Opus 4.5
LMArena Text: Polish14391378Claude Opus 4.5
LMArena Text: multi-turn14661363Claude Opus 4.5
LMArena Text: longer queries14791355Claude Opus 4.5
LMArena Text: writing and language14521344Claude Opus 4.5
LMArena Text: entertainment and media14341340Claude Opus 4.5
LMArena Vision: EnglishNot measured1216Only GPT-5 Mini measured
LMArena Vision: ChineseNot measured1214Only GPT-5 Mini measured
LMArena Vision: reading textNot measured1199Only GPT-5 Mini measured
LMArena Vision: humorNot measured1205Only GPT-5 Mini measured
LMArena Vision: captioningNot measured1217Only GPT-5 Mini measured
LMArena Vision: recognizing thingsNot measured1226Only GPT-5 Mini measured
LMArena Vision: creative writingNot measured1181Only GPT-5 Mini measured
LMArena Document1462Not measuredOnly Claude Opus 4.5 measured
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 GPT-5 Mini
BenchmarkClaude Opus 4.5GPT-5 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
GPT-5 Mini$0.0013Fits in one request

GPT-5 Mini costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.5$0.325Fits in one request
GPT-5 Mini$0.018Fits in one request

GPT-5 Mini costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.5$1.25Exceeds the context window
GPT-5 Mini$0.070Fits in one request

GPT-5 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 GPT-5 Mini
SpecificationAnthropic Claude Opus 4.5OpenAI GPT-5 Mini
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedNovember 24, 2025August 7, 2025
Context window200K400K
Input $/Mtok$5.00$0.25
Output $/Mtok$25.00$2.00
Coding index44.034.2
Independent measurements behind it32
Cost per solved task$1.37$0.08
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.5 better than GPT-5 Mini for coding?

Pick Claude Opus 4.5 for coding: it scores 44.0 on the Vibe Coding Index against 34.2 for GPT-5 Mini. Pick GPT-5 Mini for output tokens 12.5x cheaper ($2.00 vs $25.00 per million) and a lower cost per solved task ($0.08 against $1.37).

Which is cheaper, Claude Opus 4.5 or GPT-5 Mini?

Claude Opus 4.5 costs $5.00 per million input tokens and $25.00 per million output tokens; GPT-5 Mini costs $0.25 and $2.00. Per solved SWE-bench Verified task, Claude Opus 4.5 costs $1.37 and GPT-5 Mini $0.08.

Which has the bigger context window, Claude Opus 4.5 or GPT-5 Mini?

GPT-5 Mini, with 400K tokens against 200K.

How many benchmarks is the Claude Opus 4.5 vs GPT-5 Mini comparison based on?

86 benchmarks have a result for both models as of October 21, 2026. Claude Opus 4.5's coding index rests on 3 independent benchmarks and GPT-5 Mini's on 2. Where only one model has a result, the page says so instead of naming a winner.

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