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Claude Haiku 4.5 vs GPT-5.4

Updated October 21, 2026. 73 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Haiku 4.5 Replace GPT-5.4
Claude Haiku 4.5Anthropic
Coding
49.8
Overall
16.9
Output $/M
$5.00
3
GPT-5.4OpenAI
Coding
37.7
Overall
39.0
Output $/M
$15.00
70
vs boards won of 73 shared

Decision reading

Pick Claude Haiku 4.5 for coding: it scores 49.8 on the Vibe Coding Index against 37.7 for GPT-5.4.

Pick GPT-5.4 when the context window is larger, 1.05M against 200K tokens, or when what matters is LMArena WebDev or AA Coding Index, where it leads.

Model AClaude Haiku 4.5Anthropic49.8/1003 independent benchmarks$0.56 per solved taskModel BGPT-5.4OpenAI37.7/1001 independent benchmark$1.02 per solved task
Shared results
73
Claude Haiku 4.5 only
21
GPT-5.4 only
36
Like-for-like categories
8 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 Haiku 4.5 49.8 from 3 benchmarks, GPT-5.4 37.7 from 1 benchmark.
Widest category
Reasoning, 29.7 points apart on average over 9 shared benchmarks.
Widest single gap
ARC-AGI-2: Claude Haiku 4.5 4.0% against GPT-5.4 74.0%, 69.9 points apart on a 0 to 100 scale.
Output price
Claude Haiku 4.5 $5.00 against GPT-5.4 $15.00 per million output tokens, 3.0x apart.
Context window
Claude Haiku 4.5 takes 200K tokens, GPT-5.4 1.05M.

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 Haiku 4.5BarsGPT-5.4Ties
Coding013
Intelligence02
Agentic work11
Reasoning09
Math04
Knowledge013
Web design17
General121
All shared boards370
CodingLike-for-likeFour of these boards feed the Vibe Coding Index013
Coding benchmarks for Claude Haiku 4.5 and GPT-5.4
BenchmarkClaude Haiku 4.5GPT-5.4Leader
SWE-bench Verified66.6%Not measuredOnly Claude Haiku 4.5 measured
SWE-bench Multilingual64.7%Not measuredOnly Claude Haiku 4.5 measured
LiveBench coding48.1%Not measuredOnly Claude Haiku 4.5 measured
LMArena WebDev13301464GPT-5.4
AA Coding Index43.971.1GPT-5.4
LiveCodeBench (Vals AI)41.2%84.1%GPT-5.4
SWE-bench Verified (Vals AI)66.6%78.2%GPT-5.4
Vibe Code Bench (Vals AI)11.4%67.4%GPT-5.4
Code migration (Vals AI)7.5%35.0%GPT-5.4
ProgramBench (Vals AI)0.0%0.5%GPT-5.4
Terminal-Bench 2.1 (Vals AI)43.8%Not measuredOnly Claude Haiku 4.5 measured
SkillsBench (Vals AI)Not measured51.7%Only GPT-5.4 measured
Terminal-Bench Hard (Artificial Analysis run)Not measured57.6%Only GPT-5.4 measured
Terminal-Bench35.5%81.8%GPT-5.4
GSO-BenchNot measured31.4%Only GPT-5.4 measured
WeirdML45.4%77.7%GPT-5.4
MirrorCodeNot measured15.6%Only GPT-5.4 measured
ALE-BenchNot measured1607.0Only GPT-5.4 measured
LMArena Text: coding14541496GPT-5.4
LMArena Text: software and IT14391491GPT-5.4
LMArena WebDev: React13261454GPT-5.4
LMArena WebDev: HTML13181478GPT-5.4
LMArena WebDev: from an imageNot measured1436Only GPT-5.4 measured
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 Haiku 4.5 and GPT-5.4
BenchmarkClaude Haiku 4.5GPT-5.4Leader
AA Intelligence Index16.939.0GPT-5.4
Epoch Capabilities Index142.2157.3GPT-5.4
Agentic workLike-for-likePublic boards, shown as published, kept out of the index11
Agentic work benchmarks for Claude Haiku 4.5 and GPT-5.4
BenchmarkClaude Haiku 4.5GPT-5.4Leader
AA Agentic Index8.0Not measuredOnly Claude Haiku 4.5 measured
Design Arena: agents building web appsNot measured1059Only GPT-5.4 measured
Design Arena: agents building full-stack appsNot measured1017Only GPT-5.4 measured
Design Arena: agents building mobile appsNot measured1087Only GPT-5.4 measured
Design Arena: agents building Android appsNot measured1037Only GPT-5.4 measured
Design Arena: agents building Godot gamesNot measured1135Only GPT-5.4 measured
LiveBench research42.2%Not measuredOnly Claude Haiku 4.5 measured
LiveBench browser40.0%Not measuredOnly Claude Haiku 4.5 measured
LiveBench long agentic11.1%Not measuredOnly Claude Haiku 4.5 measured
Finance Agent (Vals AI)31.0%Not measuredOnly Claude Haiku 4.5 measured
Tax Agent Bench (Vals AI)5.9%Not measuredOnly Claude Haiku 4.5 measured
Legal Research Bench (Vals AI)10.6%Not measuredOnly Claude Haiku 4.5 measured
Excel Modeling Benchmark (Vals AI)22.7%Not measuredOnly Claude Haiku 4.5 measured
τ²-Bench TelecomNot measured87.1%Only GPT-5.4 measured
APEX-AgentsNot measured52.4%Only GPT-5.4 measured
METR time horizonsNot measured74.3%Only GPT-5.4 measured
BALROG31.2%Not measuredOnly Claude Haiku 4.5 measured
DeepResearch Bench45.5%35.1%Claude Haiku 4.5
PostTrainBenchNot measured19.0%Only GPT-5.4 measured
Vending-Bench 2$459$6,144GPT-5.4
Neither model has a result on the other 19 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index09
Reasoning benchmarks for Claude Haiku 4.5 and GPT-5.4
BenchmarkClaude Haiku 4.5GPT-5.4Leader
GPQA Diamond72.2%91.7%GPT-5.4
LiveBench reasoning61.7%Not measuredOnly Claude Haiku 4.5 measured
MMMU Pro (Vals AI)46.1%87.5%GPT-5.4
GPQA Diamond (Artificial Analysis run)Not measured92.0%Only GPT-5.4 measured
Humanity's Last Exam (Artificial Analysis run)Not measured43.7%Only GPT-5.4 measured
GPQA Diamond (Epoch AI run)71.2%93.3%GPT-5.4
ARC-AGI47.7%93.7%GPT-5.4
ARC-AGI-24.0%74.0%GPT-5.4
Chess puzzles8.0%48.0%GPT-5.4
Mystery game puzzlesNot measured37.0%Only GPT-5.4 measured
EBR-benchNot measured25.4%Only GPT-5.4 measured
LMArena Text: hard prompts14211485GPT-5.4
LMArena Text: expert14431507GPT-5.4
LMArena Text: hard prompts in English14351479GPT-5.4
LMArena Vision: diagramsNot measured1327Only GPT-5.4 measured
LMArena Vision: homeworkNot measured1336Only GPT-5.4 measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index04
Math benchmarks for Claude Haiku 4.5 and GPT-5.4
BenchmarkClaude Haiku 4.5GPT-5.4Leader
AIME82.7%96.7%GPT-5.4
MGSM (Vals AI)92.2%Not measuredOnly Claude Haiku 4.5 measured
OTIS Mock AIME66.7%97.8%GPT-5.4
FrontierMath, tiers 1 to 3Not measured78.6%Only GPT-5.4 measured
FrontierMath, tier 4Not measured49.0%Only GPT-5.4 measured
ProofBenchNot measured56.0%Only GPT-5.4 measured
MATH level 596.4%Not measuredOnly Claude Haiku 4.5 measured
LMArena Text: math13981488GPT-5.4
LMArena Text: mathematical work14301497GPT-5.4
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index013
Knowledge benchmarks for Claude Haiku 4.5 and GPT-5.4
BenchmarkClaude Haiku 4.5GPT-5.4Leader
MMLU Pro78.7%87.5%GPT-5.4
LegalBench (Vals AI)81.2%86.0%GPT-5.4
CaseLaw (Vals AI)56.5%63.8%GPT-5.4
CorpFin (Vals AI)60.6%65.3%GPT-5.4
TaxEval (Vals AI)67.5%74.0%GPT-5.4
MortgageTax (Vals AI)62.2%68.3%GPT-5.4
MedQA (Vals AI)79.6%96.1%GPT-5.4
MedCode (Vals AI)32.7%41.3%GPT-5.4
SimpleQA Verified13.2%45.1%GPT-5.4
LMArena Text: science14061479GPT-5.4
LMArena Text: medicine and healthcare13941458GPT-5.4
LMArena Text: legal and government14001486GPT-5.4
LMArena Text: business and finance14001474GPT-5.4
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index17
Web design benchmarks for Claude Haiku 4.5 and GPT-5.4
BenchmarkClaude Haiku 4.5GPT-5.4Leader
Design Arena: websites11221199GPT-5.4
Design Arena: UI components11001215GPT-5.4
Design Arena: game dev10971195GPT-5.4
Design Arena: data viz11241196GPT-5.4
Design Arena: 3D10721065Claude Haiku 4.5
Design Arena: all code categories11151180GPT-5.4
Design Arena: SVG10251141GPT-5.4
Design Arena: ASCII art11391188GPT-5.4
LiveBench design59.9%Not measuredOnly Claude Haiku 4.5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index121
General benchmarks for Claude Haiku 4.5 and GPT-5.4
BenchmarkClaude Haiku 4.5GPT-5.4Leader
LiveBench data analysis59.3%Not measuredOnly Claude Haiku 4.5 measured
Public Benefits Bench (Vals AI)54.3%Not measuredOnly Claude Haiku 4.5 measured
SAGE (Vals AI)31.8%43.3%GPT-5.4
MedScribe (Vals AI)85.2%77.5%Claude Haiku 4.5
Vals Multimodal Index42.9%Not measuredOnly Claude Haiku 4.5 measured
IFBenchNot measured73.9%Only GPT-5.4 measured
Long context reasoning (AA-LCR)Not measured82.0%Only GPT-5.4 measured
DTBench73.6%94.4%GPT-5.4
LMCA30.9%52.0%GPT-5.4
CL-benchNot measured27.9%Only GPT-5.4 measured
Furniture assemblyNot measured37.5%Only GPT-5.4 measured
ExploitBench13.7%Not measuredOnly Claude Haiku 4.5 measured
CL-bench LifeNot measured21.7%Only GPT-5.4 measured
LMArena Text13971469GPT-5.4
LMArena Text: instruction following14141469GPT-5.4
LMArena Text: creative writing13711439GPT-5.4
LMArena VisionNot measured1303Only GPT-5.4 measured
LMArena Text: English14141467GPT-5.4
LMArena Text: non-English13771465GPT-5.4
LMArena Text: Chinese14181520GPT-5.4
LMArena Text: German13741472GPT-5.4
LMArena Text: Japanese13381485GPT-5.4
LMArena Text: Korean13461449GPT-5.4
LMArena Text: French14111493GPT-5.4
LMArena Text: Spanish14211452GPT-5.4
LMArena Text: Russian13811480GPT-5.4
LMArena Text: Polish13431472GPT-5.4
LMArena Text: multi-turn14091482GPT-5.4
LMArena Text: longer queries14271473GPT-5.4
LMArena Text: writing and language13861458GPT-5.4
LMArena Text: entertainment and media13691438GPT-5.4
LMArena Vision: EnglishNot measured1301Only GPT-5.4 measured
LMArena Vision: ChineseNot measured1354Only GPT-5.4 measured
LMArena Vision: reading textNot measured1312Only GPT-5.4 measured
LMArena Vision: humorNot measured1284Only GPT-5.4 measured
LMArena Vision: recognizing thingsNot measured1251Only GPT-5.4 measured
LMArena Vision: creative writingNot measured1283Only GPT-5.4 measured
LMArena Document14201471GPT-5.4
Neither model has a result on the other 8 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Haiku 4.5 and GPT-5.4
BenchmarkClaude Haiku 4.5GPT-5.4Leader
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 Haiku 4.5$0.0035Fits in one request
GPT-5.4$0.010Fits in one request

Claude Haiku 4.5 costs less

Repository review

50K input + 3K output tokens

Claude Haiku 4.5$0.065Fits in one request
GPT-5.4$0.170Fits in one request

Claude Haiku 4.5 costs less

Agent loop

200K input + 10K output tokens

Claude Haiku 4.5$0.250Exceeds the context window
GPT-5.4$0.650Fits in one request

Claude Haiku 4.5 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 Haiku 4.5 and GPT-5.4
SpecificationAnthropic Claude Haiku 4.5OpenAI GPT-5.4
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedOctober 15, 2025March 5, 2026
Context window200K1.05M
Input $/Mtok$1.00$2.50
Output $/Mtok$5.00$15.00
Coding index49.837.7
Independent measurements behind it31
Cost per solved task$0.56$1.02
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Haiku 4.5 better than GPT-5.4 for coding?

Pick Claude Haiku 4.5 for coding: it scores 49.8 on the Vibe Coding Index against 37.7 for GPT-5.4. Pick GPT-5.4 when the context window is larger, 1.05M against 200K tokens, or when what matters is LMArena WebDev or AA Coding Index, where it leads.

Which is cheaper, Claude Haiku 4.5 or GPT-5.4?

Claude Haiku 4.5 costs $1.00 per million input tokens and $5.00 per million output tokens; GPT-5.4 costs $2.50 and $15.00. Per solved SWE-bench Verified task, Claude Haiku 4.5 costs $0.56 and GPT-5.4 $1.02.

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

GPT-5.4, with 1.05M tokens against 200K.

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

73 benchmarks have a result for both models as of October 21, 2026. Claude Haiku 4.5's coding index rests on 3 independent benchmarks and GPT-5.4's on 1. Where only one model has a result, the page says so instead of naming a winner.

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