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Claude Sonnet 4.5 vs GPT-5.4 Mini

Updated October 21, 2026. 61 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Sonnet 4.5 Replace GPT-5.4 Mini
Claude Sonnet 4.5Anthropic
Coding
59.1
Overall
20.7
Output $/M
$15.00
38
GPT-5.4 MiniOpenAI
Coding
28.2
Overall
24.1
Output $/M
$4.50
22
vs boards won of 61 shared, 1 tied

Decision reading

Pick Claude Sonnet 4.5 for coding: it scores 59.1 on the Vibe Coding Index against 28.2 for GPT-5.4 Mini.

Pick GPT-5.4 Mini when output tokens cost 3.3x less, or when a solved task costs $0.70 against $1.16.

Model AClaude Sonnet 4.5Anthropic59.1/1002 independent benchmarks$1.16 per solved taskModel BGPT-5.4 MiniOpenAI28.2/1001 independent benchmark$0.70 per solved task
Shared results
61
Claude Sonnet 4.5 only
31
GPT-5.4 Mini only
27
Like-for-like categories
7 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

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 Sonnet 4.5 59.1 from 2 benchmarks, GPT-5.4 Mini 28.2 from 1 benchmark.
Widest category
Math, 9.4 points apart on average over 7 shared benchmarks.
Widest single gap
FrontierMath, tiers 1 to 3: Claude Sonnet 4.5 23.9% against GPT-5.4 Mini 51.2%, 27.4 points apart on a 0 to 100 scale.
Output price
Claude Sonnet 4.5 $15.00 against GPT-5.4 Mini $4.50 per million output tokens, 3.3x apart.
Context window
Claude Sonnet 4.5 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 Sonnet 4.5BarsGPT-5.4 MiniTies
Coding28
Intelligence02
Agentic work11
Reasoning541 tie
Math25
Knowledge100
General182
All shared boards38221 tie
CodingLike-for-likeFour of these boards feed the Vibe Coding Index28
Coding benchmarks for Claude Sonnet 4.5 and GPT-5.4 Mini
BenchmarkClaude Sonnet 4.5GPT-5.4 MiniLeader
SWE-bench Verified74.8%Not measuredOnly Claude Sonnet 4.5 measured
SWE-bench Multilingual67.0%Not measuredOnly Claude Sonnet 4.5 measured
LMArena WebDev13941397GPT-5.4 Mini
AA Coding Index52.156.1GPT-5.4 Mini
LiveCodeBench (Vals AI)73.0%81.5%GPT-5.4 Mini
SWE-bench Verified (Vals AI)70.0%73.0%GPT-5.4 Mini
Terminal-Bench 4 (Vals AI)Not measured2.5%Only GPT-5.4 Mini measured
Vibe Code Bench (Vals AI)22.6%48.0%GPT-5.4 Mini
Code migration (Vals AI)Not measured12.9%Only GPT-5.4 Mini measured
ProgramBench (Vals AI)Not measured0.0%Only GPT-5.4 Mini measured
Terminal-Bench 2.1 (Vals AI)Not measured54.7%Only GPT-5.4 Mini measured
SciCodeNot measured52.1%Only GPT-5.4 Mini measured
Terminal-Bench Hard (Artificial Analysis run)Not measured52.3%Only GPT-5.4 Mini measured
Terminal-Bench46.5%Not measuredOnly Claude Sonnet 4.5 measured
FrontierCodeNot measured27.0%Only GPT-5.4 Mini measured
GSO-Bench14.7%Not measuredOnly Claude Sonnet 4.5 measured
WeirdML47.7%60.3%GPT-5.4 Mini
Cybench60.0%Not measuredOnly Claude Sonnet 4.5 measured
ALE-BenchNot measured1188.6Only GPT-5.4 Mini measured
LMArena Text: coding14881438Claude Sonnet 4.5
LMArena Text: software and IT14731436Claude Sonnet 4.5
LMArena WebDev: React13861386GPT-5.4 Mini
LMArena WebDev: HTML13991419GPT-5.4 Mini
Neither model has a result on the other 15 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Claude Sonnet 4.5 and GPT-5.4 Mini
BenchmarkClaude Sonnet 4.5GPT-5.4 MiniLeader
AA Intelligence Index20.724.1GPT-5.4 Mini
Epoch Capabilities Index146.7148.7GPT-5.4 Mini
Agentic workLike-for-likePublic boards, shown as published, kept out of the index11
Agentic work benchmarks for Claude Sonnet 4.5 and GPT-5.4 Mini
BenchmarkClaude Sonnet 4.5GPT-5.4 MiniLeader
AA Agentic Index15.817.9GPT-5.4 Mini
Design Arena: agents building web apps1060Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: agents building full-stack apps1050Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: agents building mobile apps1137Not measuredOnly Claude Sonnet 4.5 measured
Finance Agent (Vals AI)Not measured45.4%Only GPT-5.4 Mini measured
Tax Agent Bench (Vals AI)Not measured8.8%Only GPT-5.4 Mini measured
Legal Research Bench (Vals AI)Not measured12.5%Only GPT-5.4 Mini measured
Excel Modeling Benchmark (Vals AI)Not measured45.4%Only GPT-5.4 Mini measured
τ²-Bench TelecomNot measured83.3%Only GPT-5.4 Mini measured
METR time horizons67.4%Not measuredOnly Claude Sonnet 4.5 measured
Remote Labor Index2.1%Not measuredOnly Claude Sonnet 4.5 measured
GDPval42.5%Not measuredOnly Claude Sonnet 4.5 measured
DeepResearch Bench52.6%36.3%Claude Sonnet 4.5
OSWorld62.9%Not measuredOnly Claude Sonnet 4.5 measured
Vending-Bench 2$3,839Not measuredOnly Claude Sonnet 4.5 measured
Neither model has a result on the other 24 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index54
Reasoning benchmarks for Claude Sonnet 4.5 and GPT-5.4 Mini
BenchmarkClaude Sonnet 4.5GPT-5.4 MiniLeader
GPQA Diamond81.6%83.1%GPT-5.4 Mini
MMMU Pro (Vals AI)79.3%79.3%Claude Sonnet 4.5
GPQA Diamond (Artificial Analysis run)Not measured87.5%Only GPT-5.4 Mini measured
Humanity's Last Exam (Artificial Analysis run)Not measured28.1%Only GPT-5.4 Mini measured
GPQA Diamond (Epoch AI run)82.3%86.9%GPT-5.4 Mini
ARC-AGI63.7%63.7%Tie
ARC-AGI-213.6%18.9%GPT-5.4 Mini
SimpleBench54.3%Not measuredOnly Claude Sonnet 4.5 measured
Chess puzzles10.0%23.0%GPT-5.4 Mini
Mystery game puzzles17.0%11.0%Claude Sonnet 4.5
EBR-bench2.4%Not measuredOnly Claude Sonnet 4.5 measured
VPCT39.8%Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: hard prompts14621424Claude Sonnet 4.5
LMArena Text: expert14831435Claude Sonnet 4.5
LMArena Text: hard prompts in English14711420Claude Sonnet 4.5
LMArena Vision: diagramsNot measured1266Only GPT-5.4 Mini measured
LMArena Vision: homeworkNot measured1285Only GPT-5.4 Mini measured
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index25
Math benchmarks for Claude Sonnet 4.5 and GPT-5.4 Mini
BenchmarkClaude Sonnet 4.5GPT-5.4 MiniLeader
AIME88.2%95.6%GPT-5.4 Mini
MGSM (Vals AI)94.3%Not measuredOnly Claude Sonnet 4.5 measured
OTIS Mock AIME77.8%88.9%GPT-5.4 Mini
FrontierMath, tiers 1 to 323.9%51.2%GPT-5.4 Mini
FrontierMath, tier 42.4%9.8%GPT-5.4 Mini
ProofBench19.0%21.0%GPT-5.4 Mini
MATH level 597.7%Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: math14491418Claude Sonnet 4.5
LMArena Text: mathematical work14621429Claude Sonnet 4.5
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index100
Knowledge benchmarks for Claude Sonnet 4.5 and GPT-5.4 Mini
BenchmarkClaude Sonnet 4.5GPT-5.4 MiniLeader
MMLU Pro87.4%84.5%Claude Sonnet 4.5
LegalBench (Vals AI)84.1%Not measuredOnly Claude Sonnet 4.5 measured
CaseLaw (Vals AI)62.2%51.7%Claude Sonnet 4.5
CorpFin (Vals AI)62.0%60.9%Claude Sonnet 4.5
TaxEval (Vals AI)73.3%71.2%Claude Sonnet 4.5
MortgageTax (Vals AI)64.0%63.5%Claude Sonnet 4.5
MedQA (Vals AI)94.7%Not measuredOnly Claude Sonnet 4.5 measured
MedCode (Vals AI)44.1%Not measuredOnly Claude Sonnet 4.5 measured
SimpleQA Verified30.7%29.4%Claude Sonnet 4.5
LMArena Text: science14481417Claude Sonnet 4.5
LMArena Text: medicine and healthcare14441395Claude Sonnet 4.5
LMArena Text: legal and government14511414Claude Sonnet 4.5
LMArena Text: business and finance14401418Claude Sonnet 4.5
Neither model has a result on the other 4 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
Web design benchmarks for Claude Sonnet 4.5 and GPT-5.4 Mini
BenchmarkClaude Sonnet 4.5GPT-5.4 MiniLeader
Design Arena: websites1190Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: UI components1173Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: game dev1166Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: data viz1167Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: 3D1158Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: all code categories1183Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: SVG1114Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: ASCII art1204Not measuredOnly Claude Sonnet 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 index182
General benchmarks for Claude Sonnet 4.5 and GPT-5.4 Mini
BenchmarkClaude Sonnet 4.5GPT-5.4 MiniLeader
SAGE (Vals AI)36.1%50.8%GPT-5.4 Mini
MedScribe (Vals AI)84.5%Not measuredOnly Claude Sonnet 4.5 measured
Vals Multimodal IndexNot measured54.2%Only GPT-5.4 Mini measured
IFBenchNot measured73.3%Only GPT-5.4 Mini measured
Long context reasoning (AA-LCR)Not measured77.0%Only GPT-5.4 Mini measured
DTBench83.2%80.0%Claude Sonnet 4.5
LMCA38.8%40.8%GPT-5.4 Mini
LMArena Text14381412Claude Sonnet 4.5
LMArena Text: instruction following14591405Claude Sonnet 4.5
LMArena Text: creative writing14421370Claude Sonnet 4.5
LMArena VisionNot measured1245Only GPT-5.4 Mini measured
LMArena Text: English14501412Claude Sonnet 4.5
LMArena Text: non-English14251405Claude Sonnet 4.5
LMArena Text: Chinese14601446Claude Sonnet 4.5
LMArena Text: German14271408Claude Sonnet 4.5
LMArena Text: Japanese13901375Claude Sonnet 4.5
LMArena Text: Korean14021370Claude Sonnet 4.5
LMArena Text: French14591441Claude Sonnet 4.5
LMArena Text: Spanish14581405Claude Sonnet 4.5
LMArena Text: Russian14371417Claude Sonnet 4.5
LMArena Text: Polish14231415Claude Sonnet 4.5
LMArena Text: multi-turn14651429Claude Sonnet 4.5
LMArena Text: longer queries14751408Claude Sonnet 4.5
LMArena Text: writing and language14421393Claude Sonnet 4.5
LMArena Text: entertainment and media14281373Claude Sonnet 4.5
LMArena Vision: EnglishNot measured1244Only GPT-5.4 Mini measured
LMArena Vision: ChineseNot measured1286Only GPT-5.4 Mini measured
LMArena Vision: reading textNot measured1253Only GPT-5.4 Mini measured
LMArena Vision: humorNot measured1235Only GPT-5.4 Mini measured
LMArena Vision: recognizing thingsNot measured1218Only GPT-5.4 Mini measured
LMArena Vision: creative writingNot measured1222Only GPT-5.4 Mini measured
LMArena Document1450Not measuredOnly Claude Sonnet 4.5 measured
Neither model has a result on the other 14 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Sonnet 4.5 and GPT-5.4 Mini
BenchmarkClaude Sonnet 4.5GPT-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 Sonnet 4.5$0.011Fits 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 Sonnet 4.5$0.195Fits 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 Sonnet 4.5$0.750Fits 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 Sonnet 4.5 and GPT-5.4 Mini
SpecificationAnthropic Claude Sonnet 4.5OpenAI GPT-5.4 Mini
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 29, 2025March 17, 2026
Context window1M400K
Input $/Mtok$3.00$0.75
Output $/Mtok$15.00$4.50
Coding index59.128.2
Independent measurements behind it21
Cost per solved task$1.16$0.70
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Sonnet 4.5 better than GPT-5.4 Mini for coding?

Pick Claude Sonnet 4.5 for coding: it scores 59.1 on the Vibe Coding Index against 28.2 for GPT-5.4 Mini. Pick GPT-5.4 Mini when output tokens cost 3.3x less, or when a solved task costs $0.70 against $1.16.

Which is cheaper, Claude Sonnet 4.5 or GPT-5.4 Mini?

Claude Sonnet 4.5 costs $3.00 per million input tokens and $15.00 per million output tokens; GPT-5.4 Mini costs $0.75 and $4.50. Per solved SWE-bench Verified task, Claude Sonnet 4.5 costs $1.16 and GPT-5.4 Mini $0.70.

Which has the bigger context window, Claude Sonnet 4.5 or GPT-5.4 Mini?

Claude Sonnet 4.5, with 1M tokens against 400K.

How many benchmarks is the Claude Sonnet 4.5 vs GPT-5.4 Mini comparison based on?

61 benchmarks have a result for both models as of October 21, 2026. Claude Sonnet 4.5's coding index rests on 2 independent benchmarks and GPT-5.4 Mini's on 1. Where only one model has a result, the page says so instead of naming a winner.

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