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Claude Opus 5 vs GPT-5.4 Mini

Claude Opus 5 leads GPT-5.4 Mini on coding, 83.0 to 35.8 on the Vibe Coding Index, and GPT-5.4 Mini costs 5.6x less per output token ($4.50 vs $25.00 per million). Updated October 21, 2026; 81 benchmarks have a result for both.

Replace Claude Opus 5 Replace GPT-5.4 Mini
Claude Opus 5Anthropic
Coding
83.0
Overall
81.6
Output $/M
$25.00
80
GPT-5.4 MiniOpenAI
Coding
35.8
Overall
44.0
Output $/M
$4.50
1
vs boards won of 81 shared

Claude Opus 5 or GPT-5.4 Mini: which to pick

Pick Claude Opus 5 for coding: it scores 83.0 on the Vibe Coding Index against 35.8 for GPT-5.4 Mini.

Pick GPT-5.4 Mini for output tokens 5.6x cheaper ($4.50 vs $25.00 per million) and a lower cost per solved task ($0.70 against $1.33).

Model AClaude Opus 5Anthropic83.0/1006 independent benchmarks$1.33 per solved taskModel BGPT-5.4 MiniOpenAI35.8/1005 independent benchmarks$0.70 per solved task
Shared results
81
Claude Opus 5 only
50
GPT-5.4 Mini only
8
Like-for-like categories
7 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, GPT-5.4 Mini 35.8 from 5 benchmarks.
Widest category
Math, 37.4 points apart on average over 6 shared benchmarks.
Widest single gap
ProofBench: Claude Opus 5 99.0% against GPT-5.4 Mini 21.0%, 78.0 points apart on a 0 to 100 scale.
Output price
Claude Opus 5 $25.00 against GPT-5.4 Mini $4.50 per million output tokens, 5.6x apart.
Context window
Claude Opus 5 takes 1M tokens, GPT-5.4 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 5BarsGPT-5.4 MiniTies
Coding170
Intelligence20
Agentic work50
Reasoning140
Math60
Knowledge90
General271
All shared boards801
CodingLike-for-likeSix of these boards feed the Vibe Coding Index170
Coding benchmarks for Claude Opus 5 and GPT-5.4 Mini
BenchmarkClaude Opus 5GPT-5.4 MiniLeader
LiveBench coding90.8%Not measuredOnly Claude Opus 5 measured
LMArena WebDev16891397Claude Opus 5
AA Coding Index78.056.1Claude Opus 5
LiveCodeBench (Vals AI)89.0%81.5%Claude Opus 5
SWE-bench Verified (Vals AI)97.0%73.0%Claude Opus 5
Terminal-Bench 4 (Vals AI)53.5%2.5%Claude Opus 5
Vibe Code Bench (Vals AI)88.4%48.0%Claude Opus 5
Code migration (Vals AI)57.5%12.9%Claude Opus 5
ProgramBench (Vals AI)3.0%0.0%Claude Opus 5
IOI (Vals AI)84.3%Not measuredOnly Claude Opus 5 measured
Terminal-Bench 2.1 (Vals AI)84.6%54.7%Claude Opus 5
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%52.1%Claude Opus 5
Terminal-Bench Hard (Artificial Analysis run)Not measured52.3%Only GPT-5.4 Mini measured
FrontierCode53.4%27.0%Claude Opus 5
FrontierSWE52.0%Not measuredOnly Claude Opus 5 measured
WeirdML91.8%60.3%Claude Opus 5
ALE-Bench2164.61188.6Claude Opus 5
LMArena Text: coding15331438Claude Opus 5
LMArena Text: software and IT15271436Claude Opus 5
LMArena WebDev: React17111386Claude Opus 5
LMArena WebDev: HTML16801419Claude 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 13 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 5 and GPT-5.4 Mini
BenchmarkClaude Opus 5GPT-5.4 MiniLeader
AA Intelligence Index50.824.1Claude Opus 5
Epoch Capabilities Index163.9148.7Claude Opus 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index50
Agentic work benchmarks for Claude Opus 5 and GPT-5.4 Mini
BenchmarkClaude Opus 5GPT-5.4 MiniLeader
AA Agentic Index56.517.9Claude Opus 5
Design Arena: agents building web apps1266Not measuredOnly Claude Opus 5 measured
Design Arena: agents building full-stack apps1306Not measuredOnly Claude Opus 5 measured
Design Arena: agents building mobile apps1348Not measuredOnly Claude Opus 5 measured
Design Arena: agents building Android apps1254Not 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 slides1265Not 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%45.4%Claude Opus 5
Tax Agent Bench (Vals AI)45.5%8.8%Claude Opus 5
Legal Research Bench (Vals AI)55.3%12.5%Claude Opus 5
Excel Modeling Benchmark (Vals AI)73.6%45.4%Claude Opus 5
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
τ²-Bench TelecomNot measured83.3%Only GPT-5.4 Mini measured
APEX-Agents65.8%Not measuredOnly Claude Opus 5 measured
OSWorld 2.031.4%Not measuredOnly Claude Opus 5 measured
BALROG63.4%Not measuredOnly Claude Opus 5 measured
DeepResearch BenchNot measured36.3%Only GPT-5.4 Mini measured
PostTrainBench35.0%Not measuredOnly Claude Opus 5 measured
Vending-Bench 2$11,182Not measuredOnly Claude Opus 5 measured
LMArena Search1242Not measuredOnly Claude Opus 5 measured
Neither model has a result on the other 12 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index140
Reasoning benchmarks for Claude Opus 5 and GPT-5.4 Mini
BenchmarkClaude Opus 5GPT-5.4 MiniLeader
GPQA Diamond93.4%83.1%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%87.5%Claude Opus 5
Humanity's Last Exam (Artificial Analysis run)54.9%28.1%Claude Opus 5
GPQA Diamond (Epoch AI run)93.9%86.9%Claude Opus 5
ARC-AGI97.5%63.7%Claude Opus 5
ARC-AGI-290.4%18.9%Claude Opus 5
SimpleBench80.6%Not measuredOnly Claude Opus 5 measured
Chess puzzles43.0%23.0%Claude Opus 5
Mystery game puzzles59.0%11.0%Claude Opus 5
EBR-bench45.7%Not measuredOnly Claude Opus 5 measured
LMArena Text: hard prompts15271424Claude Opus 5
LMArena Text: expert15541435Claude Opus 5
LMArena Text: hard prompts in English15231420Claude Opus 5
LMArena Vision: diagrams13481266Claude Opus 5
LMArena Vision: homework13381285Claude Opus 5
Kagi LLM BenchmarkNot measured37.9%Only GPT-5.4 Mini measured
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Opus 5 and GPT-5.4 Mini
BenchmarkClaude Opus 5GPT-5.4 MiniLeader
AIMENot measured95.6%Only GPT-5.4 Mini measured
OTIS Mock AIME98.9%88.9%Claude Opus 5
FrontierMath, tiers 1 to 385.6%51.2%Claude Opus 5
FrontierMath, tier 473.2%9.8%Claude Opus 5
ProofBench99.0%21.0%Claude Opus 5
LMArena Text: math15331418Claude Opus 5
LMArena Text: mathematical work15441429Claude Opus 5
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index90
Knowledge benchmarks for Claude Opus 5 and GPT-5.4 Mini
BenchmarkClaude Opus 5GPT-5.4 MiniLeader
MMLU Pro91.6%84.5%Claude Opus 5
LegalBench (Vals AI)87.0%Not measuredOnly Claude Opus 5 measured
CaseLaw (Vals AI)Not measured51.7%Only GPT-5.4 Mini measured
CorpFin (Vals AI)73.2%60.9%Claude Opus 5
TaxEval (Vals AI)75.1%71.2%Claude Opus 5
MortgageTax (Vals AI)72.1%63.5%Claude Opus 5
MedCode (Vals AI)63.6%Not measuredOnly Claude Opus 5 measured
SimpleQA Verified59.9%29.4%Claude Opus 5
LMArena Text: science15311417Claude Opus 5
LMArena Text: medicine and healthcare15251395Claude Opus 5
LMArena Text: legal and government15301414Claude Opus 5
LMArena Text: business and finance15011418Claude Opus 5
Neither model has a result on the other 6 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index9 boards, none shared
Web design benchmarks for Claude Opus 5 and GPT-5.4 Mini
BenchmarkClaude Opus 5GPT-5.4 MiniLeader
Design Arena: websites1309Not measuredOnly Claude Opus 5 measured
Design Arena: UI components1349Not measuredOnly Claude Opus 5 measured
Design Arena: game dev1338Not measuredOnly Claude Opus 5 measured
Design Arena: data viz1329Not measuredOnly Claude Opus 5 measured
Design Arena: 3D1335Not measuredOnly Claude Opus 5 measured
Design Arena: all code categories1324Not measuredOnly Claude Opus 5 measured
Design Arena: SVG1311Not measuredOnly Claude Opus 5 measured
Design Arena: ASCII art1352Not measuredOnly Claude Opus 5 measured
LiveBench design83.0%Not measuredOnly Claude Opus 5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index271
General benchmarks for Claude Opus 5 and GPT-5.4 Mini
BenchmarkClaude Opus 5GPT-5.4 MiniLeader
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%50.8%GPT-5.4 Mini
MedScribe (Vals AI)91.0%Not measuredOnly Claude Opus 5 measured
Vals Multimodal Index73.9%54.2%Claude Opus 5
IFBenchNot measured73.3%Only GPT-5.4 Mini measured
Long context reasoning (AA-LCR)82.0%77.0%Claude Opus 5
DTBench97.9%80.0%Claude Opus 5
LMCA64.5%40.8%Claude Opus 5
Furniture assembly60.8%Not measuredOnly Claude Opus 5 measured
LMArena Text15091412Claude Opus 5
LMArena Text: instruction following15181405Claude Opus 5
LMArena Text: creative writing14931370Claude Opus 5
LMArena Vision13201245Claude Opus 5
LMArena Text: English15081412Claude Opus 5
LMArena Text: non-English15021405Claude Opus 5
LMArena Text: Chinese15731446Claude Opus 5
LMArena Text: German15271408Claude Opus 5
LMArena Text: Japanese15201375Claude Opus 5
LMArena Text: Korean15171370Claude Opus 5
LMArena Text: French15191441Claude Opus 5
LMArena Text: Spanish15231405Claude Opus 5
LMArena Text: Russian15071417Claude Opus 5
LMArena Text: Polish15221415Claude Opus 5
LMArena Text: multi-turn15001429Claude Opus 5
LMArena Text: longer queries15171408Claude Opus 5
LMArena Text: writing and language14991393Claude Opus 5
LMArena Text: entertainment and media14811373Claude Opus 5
LMArena Vision: English13151244Claude Opus 5
LMArena Vision: Chinese14001286Claude Opus 5
LMArena Vision: reading text13291253Claude Opus 5
LMArena Vision: humor12931235Claude Opus 5
LMArena Vision: recognizing thingsNot measured1218Only GPT-5.4 Mini measured
LMArena Vision: creative writing13131222Claude Opus 5
LMArena Document1516Not measuredOnly Claude Opus 5 measured
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 5 and GPT-5.4 Mini
BenchmarkClaude Opus 5GPT-5.4 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 5$0.018Fits in one request
GPT-5.4 Mini$0.0030Fits in one request

GPT-5.4 Mini costs less

Repository review

50K input + 3K output tokens

Claude Opus 5$0.325Fits in one request
GPT-5.4 Mini$0.051Fits in one request

GPT-5.4 Mini costs less

Agent loop

200K input + 10K output tokens

Claude Opus 5$1.25Fits in one request
GPT-5.4 Mini$0.195Fits in one request

GPT-5.4 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 5 and GPT-5.4 Mini
SpecificationAnthropic Claude Opus 5OpenAI GPT-5.4 Mini
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedJuly 24, 2026March 17, 2026
Context window1M400K
Input $/Mtok$5.00$0.75
Output $/Mtok$25.00$4.50
Coding index83.035.8
Independent measurements behind it65
Cost per solved task$1.33$0.70
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 5 better than GPT-5.4 Mini for coding?

Pick Claude Opus 5 for coding: it scores 83.0 on the Vibe Coding Index against 35.8 for GPT-5.4 Mini. Pick GPT-5.4 Mini for output tokens 5.6x cheaper ($4.50 vs $25.00 per million) and a lower cost per solved task ($0.70 against $1.33).

Which is cheaper, Claude Opus 5 or GPT-5.4 Mini?

Claude Opus 5 costs $5.00 per million input tokens and $25.00 per million output tokens; GPT-5.4 Mini costs $0.75 and $4.50. Per solved SWE-bench Verified task, Claude Opus 5 costs $1.33 and GPT-5.4 Mini $0.70.

Which has the bigger context window, Claude Opus 5 or GPT-5.4 Mini?

Claude Opus 5, with 1M tokens against 400K.

How many benchmarks is the Claude Opus 5 vs GPT-5.4 Mini comparison based on?

81 benchmarks have a result for both models as of October 21, 2026. Claude Opus 5's coding index rests on 6 independent benchmarks and GPT-5.4 Mini's on 5. Where only one model has a result, the page says so instead of naming a winner.

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