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Claude Haiku 4.5 vs GPT-5 Nano

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 Haiku 4.5 Replace GPT-5 Nano
Claude Haiku 4.5Anthropic
Coding
49.8
Overall
16.9
Output $/M
$5.00
56
GPT-5 NanoOpenAI
Coding
34.8
Overall
13.0
Output $/M
$0.40
5
vs boards won of 61 shared

Decision reading

Pick Claude Haiku 4.5 for coding: it scores 49.8 on the Vibe Coding Index against 34.8 for GPT-5 Nano.

Pick GPT-5 Nano when output tokens cost 12.5x less, or when a solved task costs $0.109 against $0.56.

Model AClaude Haiku 4.5Anthropic49.8/1003 independent benchmarks$0.56 per solved taskModel BGPT-5 NanoOpenAI34.8/1001 independent benchmark$0.109 per solved task
Shared results
61
Claude Haiku 4.5 only
33
GPT-5 Nano only
24
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 Haiku 4.5 49.8 from 3 benchmarks, GPT-5 Nano 34.8 from 1 benchmark.
Widest category
Coding, 19.1 points apart on average over 6 shared benchmarks.
Widest single gap
SWE-bench Verified: Claude Haiku 4.5 66.6% against GPT-5 Nano 34.8%, 31.8 points apart on a 0 to 100 scale.
Output price
Claude Haiku 4.5 $5.00 against GPT-5 Nano $0.40 per million output tokens, 12.5x apart.
Context window
Claude Haiku 4.5 takes 200K tokens, GPT-5 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 Haiku 4.5BarsGPT-5 NanoTies
Coding51
Intelligence20
Reasoning72
Math51
Knowledge111
Web design60
General200
All shared boards565
CodingLike-for-likeFour of these boards feed the Vibe Coding Index51
Coding benchmarks for Claude Haiku 4.5 and GPT-5 Nano
BenchmarkClaude Haiku 4.5GPT-5 NanoLeader
SWE-bench Verified66.6%34.8%Claude Haiku 4.5
SWE-bench Multilingual64.7%Not measuredOnly Claude Haiku 4.5 measured
LiveBench coding48.1%Not measuredOnly Claude Haiku 4.5 measured
LMArena WebDev1330Not measuredOnly Claude Haiku 4.5 measured
AA Coding Index43.9Not measuredOnly Claude Haiku 4.5 measured
LiveCodeBench (Vals AI)41.2%70.2%GPT-5 Nano
SWE-bench Verified (Vals AI)66.6%Not measuredOnly Claude Haiku 4.5 measured
Vibe Code Bench (Vals AI)11.4%Not measuredOnly Claude Haiku 4.5 measured
Code migration (Vals AI)7.5%Not measuredOnly Claude Haiku 4.5 measured
ProgramBench (Vals AI)0.0%Not measuredOnly Claude Haiku 4.5 measured
Terminal-Bench 2.1 (Vals AI)43.8%Not measuredOnly Claude Haiku 4.5 measured
LiveCodeBench (Artificial Analysis run)Not measured78.9%Only GPT-5 Nano measured
Terminal-Bench Hard (Artificial Analysis run)Not measured17.4%Only GPT-5 Nano measured
Terminal-Bench35.5%21.8%Claude Haiku 4.5
WeirdML45.4%38.1%Claude Haiku 4.5
LMArena Text: coding14541351Claude Haiku 4.5
LMArena Text: software and IT14391345Claude Haiku 4.5
LMArena WebDev: React1326Not measuredOnly Claude Haiku 4.5 measured
LMArena WebDev: HTML1318Not measuredOnly Claude Haiku 4.5 measured
Neither model has a result on the other 19 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Haiku 4.5 and GPT-5 Nano
BenchmarkClaude Haiku 4.5GPT-5 NanoLeader
AA Intelligence Index16.913.0Claude Haiku 4.5
Epoch Capabilities Index142.2139.2Claude Haiku 4.5
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index12 boards, none shared
Agentic work benchmarks for Claude Haiku 4.5 and GPT-5 Nano
BenchmarkClaude Haiku 4.5GPT-5 NanoLeader
AA Agentic Index8.0Not measuredOnly Claude Haiku 4.5 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 measured36.5%Only GPT-5 Nano measured
BALROG31.2%Not measuredOnly Claude Haiku 4.5 measured
DeepResearch Bench45.5%Not measuredOnly Claude Haiku 4.5 measured
Vending-Bench 2$459Not measuredOnly Claude Haiku 4.5 measured
Neither model has a result on the other 27 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index72
Reasoning benchmarks for Claude Haiku 4.5 and GPT-5 Nano
BenchmarkClaude Haiku 4.5GPT-5 NanoLeader
GPQA Diamond72.2%63.4%Claude Haiku 4.5
LiveBench reasoning61.7%Not measuredOnly Claude Haiku 4.5 measured
MMMU Pro (Vals AI)46.1%70.9%GPT-5 Nano
GPQA Diamond (Artificial Analysis run)Not measured67.6%Only GPT-5 Nano measured
Humanity's Last Exam (Artificial Analysis run)Not measured9.5%Only GPT-5 Nano measured
GPQA Diamond (Epoch AI run)71.2%69.4%Claude Haiku 4.5
ARC-AGI47.7%20.7%Claude Haiku 4.5
ARC-AGI-24.0%2.6%Claude Haiku 4.5
Chess puzzles8.0%22.0%GPT-5 Nano
Mystery game puzzlesNot measured9.0%Only GPT-5 Nano measured
VPCTNot measured37.2%Only GPT-5 Nano measured
LMArena Text: hard prompts14211328Claude Haiku 4.5
LMArena Text: expert14431321Claude Haiku 4.5
LMArena Text: hard prompts in English14351338Claude Haiku 4.5
LMArena Vision: diagramsNot measured1141Only GPT-5 Nano measured
LMArena Vision: homeworkNot measured1157Only GPT-5 Nano measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index51
Math benchmarks for Claude Haiku 4.5 and GPT-5 Nano
BenchmarkClaude Haiku 4.5GPT-5 NanoLeader
AIME82.7%81.2%Claude Haiku 4.5
MATH 500 (Vals AI)Not measured93.8%Only GPT-5 Nano measured
MGSM (Vals AI)92.2%89.3%Claude Haiku 4.5
AA Math IndexNot measured83.7Only GPT-5 Nano measured
AIME 2025 (Artificial Analysis run)Not measured83.7%Only GPT-5 Nano measured
OTIS Mock AIME66.7%81.1%GPT-5 Nano
FrontierMath, tiers 1 to 3Not measured20.0%Only GPT-5 Nano measured
FrontierMath, tier 4Not measured2.4%Only GPT-5 Nano measured
ProofBenchNot measured12.0%Only GPT-5 Nano measured
MATH level 596.4%95.2%Claude Haiku 4.5
LMArena Text: math13981317Claude Haiku 4.5
LMArena Text: mathematical work14301326Claude Haiku 4.5
Neither model has a result on the other 1 board here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index111
Knowledge benchmarks for Claude Haiku 4.5 and GPT-5 Nano
BenchmarkClaude Haiku 4.5GPT-5 NanoLeader
MMLU Pro78.7%76.1%Claude Haiku 4.5
LegalBench (Vals AI)81.2%50.1%Claude Haiku 4.5
CaseLaw (Vals AI)56.5%52.6%Claude Haiku 4.5
CorpFin (Vals AI)60.6%Not measuredOnly Claude Haiku 4.5 measured
TaxEval (Vals AI)67.5%67.4%Claude Haiku 4.5
MortgageTax (Vals AI)62.2%53.6%Claude Haiku 4.5
MedQA (Vals AI)79.6%93.3%GPT-5 Nano
MedCode (Vals AI)32.7%30.4%Claude Haiku 4.5
MMLU Pro (Artificial Analysis run)Not measured78.0%Only GPT-5 Nano measured
SimpleQA Verified13.2%11.7%Claude Haiku 4.5
LMArena Text: science14061318Claude Haiku 4.5
LMArena Text: medicine and healthcare13941335Claude Haiku 4.5
LMArena Text: legal and government14001298Claude Haiku 4.5
LMArena Text: business and finance14001311Claude Haiku 4.5
Neither model has a result on the other 3 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index60
Web design benchmarks for Claude Haiku 4.5 and GPT-5 Nano
BenchmarkClaude Haiku 4.5GPT-5 NanoLeader
Design Arena: websites11221101Claude Haiku 4.5
Design Arena: UI components11001066Claude Haiku 4.5
Design Arena: game dev10971045Claude Haiku 4.5
Design Arena: data viz11241056Claude Haiku 4.5
Design Arena: 3D1072966Claude Haiku 4.5
Design Arena: all code categories11151084Claude Haiku 4.5
Design Arena: SVG1025Not measuredOnly Claude Haiku 4.5 measured
Design Arena: ASCII art1139Not measuredOnly Claude Haiku 4.5 measured
LiveBench design59.9%Not measuredOnly Claude Haiku 4.5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index200
General benchmarks for Claude Haiku 4.5 and GPT-5 Nano
BenchmarkClaude Haiku 4.5GPT-5 NanoLeader
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%30.4%Claude Haiku 4.5
MedScribe (Vals AI)85.2%72.9%Claude Haiku 4.5
Vals Multimodal Index42.9%Not measuredOnly Claude Haiku 4.5 measured
IFBenchNot measured67.6%Only GPT-5 Nano measured
Long context reasoning (AA-LCR)Not measured45.0%Only GPT-5 Nano measured
DTBench73.6%62.7%Claude Haiku 4.5
LMCA30.9%7.9%Claude Haiku 4.5
Fiction.LiveBenchNot measured44.4%Only GPT-5 Nano measured
ExploitBench13.7%Not measuredOnly Claude Haiku 4.5 measured
LMArena Text13971320Claude Haiku 4.5
LMArena Text: instruction following14141306Claude Haiku 4.5
LMArena Text: creative writing13711249Claude Haiku 4.5
LMArena VisionNot measured1159Only GPT-5 Nano measured
LMArena Text: English14141321Claude Haiku 4.5
LMArena Text: non-English13771313Claude Haiku 4.5
LMArena Text: Chinese14181356Claude Haiku 4.5
LMArena Text: German13741327Claude Haiku 4.5
LMArena Text: Japanese13381227Claude Haiku 4.5
LMArena Text: Korean13461269Claude Haiku 4.5
LMArena Text: French1411Not measuredOnly Claude Haiku 4.5 measured
LMArena Text: Spanish14211360Claude Haiku 4.5
LMArena Text: Russian13811296Claude Haiku 4.5
LMArena Text: Polish13431314Claude Haiku 4.5
LMArena Text: multi-turn14091311Claude Haiku 4.5
LMArena Text: longer queries14271312Claude Haiku 4.5
LMArena Text: writing and language13861283Claude Haiku 4.5
LMArena Text: entertainment and media13691268Claude Haiku 4.5
LMArena Vision: EnglishNot measured1170Only GPT-5 Nano measured
LMArena Vision: ChineseNot measured1176Only GPT-5 Nano measured
LMArena Vision: reading textNot measured1152Only GPT-5 Nano measured
LMArena Vision: humorNot measured1110Only GPT-5 Nano measured
LMArena Document1420Not measuredOnly Claude Haiku 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 Haiku 4.5 and GPT-5 Nano
BenchmarkClaude Haiku 4.5GPT-5 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 Haiku 4.5$0.0035Fits in one request
GPT-5 Nano$0.0003Fits in one request

GPT-5 Nano costs less

Repository review

50K input + 3K output tokens

Claude Haiku 4.5$0.065Fits in one request
GPT-5 Nano$0.0037Fits in one request

GPT-5 Nano costs less

Agent loop

200K input + 10K output tokens

Claude Haiku 4.5$0.250Exceeds the context window
GPT-5 Nano$0.014Fits in one request

GPT-5 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 Haiku 4.5 and GPT-5 Nano
SpecificationAnthropic Claude Haiku 4.5OpenAI GPT-5 Nano
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedOctober 15, 2025August 7, 2025
Context window200K400K
Input $/Mtok$1.00$0.05
Output $/Mtok$5.00$0.40
Coding index49.834.8
Independent measurements behind it31
Cost per solved task$0.56$0.109
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Haiku 4.5 better than GPT-5 Nano for coding?

Pick Claude Haiku 4.5 for coding: it scores 49.8 on the Vibe Coding Index against 34.8 for GPT-5 Nano. Pick GPT-5 Nano when output tokens cost 12.5x less, or when a solved task costs $0.109 against $0.56.

Which is cheaper, Claude Haiku 4.5 or GPT-5 Nano?

Claude Haiku 4.5 costs $1.00 per million input tokens and $5.00 per million output tokens; GPT-5 Nano costs $0.05 and $0.40. Per solved SWE-bench Verified task, Claude Haiku 4.5 costs $0.56 and GPT-5 Nano $0.109.

Which has the bigger context window, Claude Haiku 4.5 or GPT-5 Nano?

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

How many benchmarks is the Claude Haiku 4.5 vs GPT-5 Nano comparison based on?

61 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 Nano's on 1. Where only one model has a result, the page says so instead of naming a winner.

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