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Claude Opus 4.5 vs GPT-5.4 Nano

GPT-5.4 Nano leads Claude Opus 4.5 on coding, 44.8 to 44.0 on the Vibe Coding Index, and GPT-5.4 Nano costs 20.0x less per output token ($1.25 vs $25.00 per million). Updated October 22, 2026; 65 benchmarks have a result for both.

Replace Claude Opus 4.5 Replace GPT-5.4 Nano
Claude Opus 4.5Anthropic
Coding
44.0
Overall
55.7
Output $/M
$25.00
58
GPT-5.4 NanoOpenAI
Coding
44.8
Overall
45.7
Output $/M
$1.25
7
vs boards won of 65 shared

Claude Opus 4.5 or GPT-5.4 Nano: which to pick

Claude Opus 4.5 and GPT-5.4 Nano are level for coding, 44.0 against 44.8 on the Vibe Coding Index, so price and context decide.

Pick Claude Opus 4.5 for work measured by SWE-bench Verified (Vals AI) or Terminal-Bench Hard (Artificial Analysis run), where it leads. Pick GPT-5.4 Nano for output tokens 20.0x cheaper ($1.25 vs $25.00 per million) and a lower cost per solved task ($0.14 against $1.37).

Model AClaude Opus 4.5Anthropic44.0/1003 independent benchmarks$1.37 per solved taskModel BGPT-5.4 NanoOpenAI44.8/1002 independent benchmarks$0.14 per solved task
Shared results
65
Claude Opus 4.5 only
43
GPT-5.4 Nano only
20
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 4.5 44.0 from 3 benchmarks, GPT-5.4 Nano 44.8 from 2 benchmarks.
Widest category
Reasoning, 17.2 points apart on average over 13 shared benchmarks.
Widest single gap
Kagi LLM Benchmark: Claude Opus 4.5 80.2% against GPT-5.4 Nano 39.7%, 40.5 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.5 $25.00 against GPT-5.4 Nano $1.25 per million output tokens, 20.0x apart.
Context window
Claude Opus 4.5 takes 200K tokens, GPT-5.4 Nano 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-5.4 NanoTies
Coding52
Intelligence20
Agentic work10
Reasoning121
Math43
Knowledge120
General221
All shared boards587
CodingLike-for-likeSix of these boards feed the Vibe Coding Index52
Coding benchmarks for Claude Opus 4.5 and GPT-5.4 Nano
BenchmarkClaude Opus 4.5GPT-5.4 NanoLeader
SWE-bench Verified79.2%Not measuredOnly Claude Opus 4.5 measured
SWE-bench (full test set)52.6%Not measuredOnly Claude Opus 4.5 measured
SWE-bench Multilingual70.7%Not measuredOnly Claude Opus 4.5 measured
LMArena WebDev1494Not measuredOnly Claude Opus 4.5 measured
AA Coding IndexNot measured56.1Only GPT-5.4 Nano measured
LiveCodeBench (Vals AI)83.7%84.0%GPT-5.4 Nano
SWE-bench Verified (Vals AI)76.4%69.8%Claude Opus 4.5
Vibe Code Bench (Vals AI)20.6%26.1%GPT-5.4 Nano
Code migration (Vals AI)Not measured14.5%Only GPT-5.4 Nano measured
Terminal-Bench 2.1 (Vals AI)Not measured41.6%Only GPT-5.4 Nano measured
LiveCodeBench (Artificial Analysis run)87.1%Not measuredOnly Claude Opus 4.5 measured
SciCodeNot measured47.2%Only GPT-5.4 Nano measured
Terminal-Bench Hard (Artificial Analysis run)47.0%42.4%Claude Opus 4.5
Terminal-Bench63.1%Not measuredOnly Claude Opus 4.5 measured
GSO-Bench26.5%Not measuredOnly Claude Opus 4.5 measured
WeirdML63.7%49.2%Claude Opus 4.5
Cybench82.0%Not measuredOnly Claude Opus 4.5 measured
ALE-BenchNot measured1004.5Only GPT-5.4 Nano measured
LMArena Text: coding15031404Claude Opus 4.5
LMArena Text: software and IT14831402Claude 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 17 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 4.5 and GPT-5.4 Nano
BenchmarkClaude Opus 4.5GPT-5.4 NanoLeader
AA Intelligence Index29.120.7Claude Opus 4.5
Epoch Capabilities Index150.1146.0Claude Opus 4.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for Claude Opus 4.5 and GPT-5.4 Nano
BenchmarkClaude Opus 4.5GPT-5.4 NanoLeader
AA Agentic IndexNot measured16.0Only GPT-5.4 Nano measured
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 apps1176Not measuredOnly Claude Opus 4.5 measured
Finance Agent (Vals AI)Not measured38.2%Only GPT-5.4 Nano measured
Tax Agent Bench (Vals AI)Not measured5.0%Only GPT-5.4 Nano measured
Legal Research Bench (Vals AI)Not measured6.3%Only GPT-5.4 Nano measured
Excel Modeling Benchmark (Vals AI)Not measured44.8%Only GPT-5.4 Nano measured
τ²-Bench Telecom89.5%76.0%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$4,967Not measuredOnly Claude Opus 4.5 measured
Berkeley Function Calling Leaderboard (BFCL)77.5%Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 23 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index121
Reasoning benchmarks for Claude Opus 4.5 and GPT-5.4 Nano
BenchmarkClaude Opus 4.5GPT-5.4 NanoLeader
GPQA Diamond85.9%77.5%Claude Opus 4.5
MMMU Pro (Vals AI)83.0%73.6%Claude Opus 4.5
GPQA Diamond (Artificial Analysis run)86.6%81.7%Claude Opus 4.5
Humanity's Last Exam (Artificial Analysis run)30.1%28.3%Claude Opus 4.5
GPQA Diamond (Epoch AI run)86.0%78.5%Claude Opus 4.5
ARC-AGI80.0%51.5%Claude Opus 4.5
ARC-AGI-237.6%5.7%Claude Opus 4.5
SimpleBench62.0%Not measuredOnly Claude Opus 4.5 measured
Chess puzzles14.0%45.0%GPT-5.4 Nano
Mystery game puzzles22.0%9.0%Claude Opus 4.5
EBR-bench14.3%Not measuredOnly Claude Opus 4.5 measured
VPCT40.0%Not measuredOnly Claude Opus 4.5 measured
LMArena Text: hard prompts14761381Claude Opus 4.5
LMArena Text: expert14871396Claude Opus 4.5
LMArena Text: hard prompts in English14821387Claude Opus 4.5
LMArena Vision: diagramsNot measured1210Only GPT-5.4 Nano measured
LMArena Vision: homeworkNot measured1225Only GPT-5.4 Nano measured
Kagi LLM Benchmark80.2%39.7%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 index43
Math benchmarks for Claude Opus 4.5 and GPT-5.4 Nano
BenchmarkClaude Opus 4.5GPT-5.4 NanoLeader
AIME95.4%88.8%Claude Opus 4.5
MGSM (Vals AI)95.2%Not measuredOnly Claude Opus 4.5 measured
AA Math Index91.3Not measuredOnly Claude Opus 4.5 measured
AIME 2025 (Artificial Analysis run)91.3%Not measuredOnly Claude Opus 4.5 measured
OTIS Mock AIME86.1%87.8%GPT-5.4 Nano
FrontierMath, tiers 1 to 334.4%44.9%GPT-5.4 Nano
FrontierMath, tier 44.9%12.2%GPT-5.4 Nano
ProofBench36.0%5.0%Claude Opus 4.5
LMArena Text: math14631405Claude Opus 4.5
LMArena Text: mathematical work14681409Claude Opus 4.5
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index120
Knowledge benchmarks for Claude Opus 4.5 and GPT-5.4 Nano
BenchmarkClaude Opus 4.5GPT-5.4 NanoLeader
MMLU Pro87.3%77.2%Claude Opus 4.5
LegalBench (Vals AI)84.6%77.9%Claude Opus 4.5
CaseLaw (Vals AI)62.6%51.9%Claude Opus 4.5
CorpFin (Vals AI)65.1%61.2%Claude Opus 4.5
TaxEval (Vals AI)74.9%67.4%Claude Opus 4.5
MortgageTax (Vals AI)68.7%59.1%Claude Opus 4.5
MedQA (Vals AI)95.9%Not measuredOnly Claude Opus 4.5 measured
MedCode (Vals AI)49.2%41.0%Claude Opus 4.5
MMLU Pro (Artificial Analysis run)89.5%Not measuredOnly Claude Opus 4.5 measured
SimpleQA Verified45.7%11.7%Claude Opus 4.5
GeoBench75.0%Not measuredOnly Claude Opus 4.5 measured
LMArena Text: science14541374Claude Opus 4.5
LMArena Text: medicine and healthcare14441369Claude Opus 4.5
LMArena Text: legal and government14591368Claude Opus 4.5
LMArena Text: business and finance14481366Claude Opus 4.5
FACTS Benchmark Suite43.9%Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 2 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
Web design benchmarks for Claude Opus 4.5 and GPT-5.4 Nano
BenchmarkClaude Opus 4.5GPT-5.4 NanoLeader
Design Arena: websites1247Not measuredOnly Claude Opus 4.5 measured
Design Arena: UI components1235Not measuredOnly Claude Opus 4.5 measured
Design Arena: game dev1228Not measuredOnly Claude Opus 4.5 measured
Design Arena: data viz1243Not measuredOnly Claude Opus 4.5 measured
Design Arena: 3D1213Not measuredOnly Claude Opus 4.5 measured
Design Arena: all code categories1242Not measuredOnly Claude Opus 4.5 measured
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 index221
General benchmarks for Claude Opus 4.5 and GPT-5.4 Nano
BenchmarkClaude Opus 4.5GPT-5.4 NanoLeader
SAGE (Vals AI)52.1%38.1%Claude Opus 4.5
MedScribe (Vals AI)85.3%77.1%Claude Opus 4.5
Vals Multimodal IndexNot measured47.6%Only GPT-5.4 Nano measured
IFBench58.0%75.9%GPT-5.4 Nano
Long context reasoning (AA-LCR)77.3%76.7%Claude Opus 4.5
DTBench89.9%80.3%Claude Opus 4.5
LMCA44.5%36.9%Claude Opus 4.5
CL-bench21.1%Not measuredOnly Claude Opus 4.5 measured
Furniture assembly28.3%Not measuredOnly Claude Opus 4.5 measured
LMArena Text14511372Claude Opus 4.5
LMArena Text: instruction following14781362Claude Opus 4.5
LMArena Text: creative writing14451315Claude Opus 4.5
LMArena VisionNot measured1196Only GPT-5.4 Nano measured
LMArena Text: English14611381Claude Opus 4.5
LMArena Text: non-English14381359Claude Opus 4.5
LMArena Text: Chinese14701391Claude Opus 4.5
LMArena Text: German14491368Claude Opus 4.5
LMArena Text: Japanese14171343Claude Opus 4.5
LMArena Text: Korean14241321Claude Opus 4.5
LMArena Text: French14711395Claude Opus 4.5
LMArena Text: Spanish14571371Claude Opus 4.5
LMArena Text: Russian14471363Claude Opus 4.5
LMArena Text: Polish14391366Claude Opus 4.5
LMArena Text: multi-turn14661382Claude Opus 4.5
LMArena Text: longer queries14791365Claude Opus 4.5
LMArena Text: writing and language14521338Claude Opus 4.5
LMArena Text: entertainment and media14341325Claude Opus 4.5
LMArena Vision: EnglishNot measured1202Only GPT-5.4 Nano measured
LMArena Vision: ChineseNot measured1232Only GPT-5.4 Nano measured
LMArena Vision: reading textNot measured1204Only GPT-5.4 Nano measured
LMArena Vision: humorNot measured1161Only GPT-5.4 Nano measured
LMArena Vision: recognizing thingsNot measured1141Only GPT-5.4 Nano measured
LMArena Vision: creative writingNot measured1159Only GPT-5.4 Nano measured
LMArena Document1462Not measuredOnly Claude Opus 4.5 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 4.5 and GPT-5.4 Nano
BenchmarkClaude Opus 4.5GPT-5.4 NanoLeader
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-5.4 Nano$0.0008Fits in one request

GPT-5.4 Nano costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.5$0.325Fits in one request
GPT-5.4 Nano$0.014Fits in one request

GPT-5.4 Nano costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.5$1.25Exceeds the context window
GPT-5.4 Nano$0.052Fits in one request

GPT-5.4 Nano 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-5.4 Nano
SpecificationAnthropic Claude Opus 4.5OpenAI GPT-5.4 Nano
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedNovember 24, 2025March 17, 2026
Context window200K400K
Input $/Mtok$5.00$0.20
Output $/Mtok$25.00$1.25
Coding index44.044.8
Independent measurements behind it32
Cost per solved task$1.37$0.14
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.5 better than GPT-5.4 Nano for coding?

Claude Opus 4.5 and GPT-5.4 Nano are level for coding, 44.0 against 44.8 on the Vibe Coding Index, so price and context decide. Pick Claude Opus 4.5 for work measured by SWE-bench Verified (Vals AI) or Terminal-Bench Hard (Artificial Analysis run), where it leads. Pick GPT-5.4 Nano for output tokens 20.0x cheaper ($1.25 vs $25.00 per million) and a lower cost per solved task ($0.14 against $1.37).

Which is cheaper, Claude Opus 4.5 or GPT-5.4 Nano?

Claude Opus 4.5 costs $5.00 per million input tokens and $25.00 per million output tokens; GPT-5.4 Nano costs $0.20 and $1.25. Per solved SWE-bench Verified task, Claude Opus 4.5 costs $1.37 and GPT-5.4 Nano $0.14.

Which has the bigger context window, Claude Opus 4.5 or GPT-5.4 Nano?

GPT-5.4 Nano, with 400K tokens against 200K.

How many benchmarks is the Claude Opus 4.5 vs GPT-5.4 Nano comparison based on?

65 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 GPT-5.4 Nano's on 2. Where only one model has a result, the page says so instead of naming a winner.

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