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Claude Haiku 4.5 vs GPT-5 Mini

Claude Haiku 4.5 leads GPT-5 Mini on coding, 35.6 to 34.2 on the Vibe Coding Index, and GPT-5 Mini costs 2.5x less per output token ($2.00 vs $5.00 per million). Updated October 22, 2026; 70 benchmarks have a result for both.

Replace Claude Haiku 4.5 Replace GPT-5 Mini
Claude Haiku 4.5Anthropic
Coding
35.6
Overall
41.0
Output $/M
$5.00
36
GPT-5 MiniOpenAI
Coding
34.2
Overall
43.7
Output $/M
$2.00
33
vs boards won of 70 shared, 1 tied

Claude Haiku 4.5 or GPT-5 Mini: which to pick

Claude Haiku 4.5 and GPT-5 Mini are level for coding, 35.6 against 34.2 on the Vibe Coding Index, so price and context decide.

Pick GPT-5 Mini for output tokens 2.5x cheaper ($2.00 vs $5.00 per million) and a lower cost per solved task ($0.08 against $0.56). Pick Claude Haiku 4.5 for work measured by SWE-bench Verified or SWE-bench Multilingual, where it leads.

Model AClaude Haiku 4.5Anthropic35.6/1004 independent benchmarks$0.56 per solved taskModel BGPT-5 MiniOpenAI34.2/1002 independent benchmarks$0.08 per solved task
Shared results
70
Claude Haiku 4.5 only
25
GPT-5 Mini only
31
Like-for-like categories
8 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 Haiku 4.5 35.6 from 4 benchmarks, GPT-5 Mini 34.2 from 2 benchmarks.
Widest category
Coding, 12.1 points apart on average over 9 shared benchmarks.
Widest single gap
LiveCodeBench (Vals AI): Claude Haiku 4.5 41.2% against GPT-5 Mini 86.6%, 45.4 points apart on a 0 to 100 scale.
Output price
Claude Haiku 4.5 $5.00 against GPT-5 Mini $2.00 per million output tokens, 2.5x apart.
Context window
Claude Haiku 4.5 takes 200K tokens, GPT-5 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 Haiku 4.5BarsGPT-5 MiniTies
Coding63
Intelligence02
Agentic work20
Reasoning36
Math24
Knowledge58
Web design251 tie
General165
All shared boards36331 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index63
Coding benchmarks for Claude Haiku 4.5 and GPT-5 Mini
BenchmarkClaude Haiku 4.5GPT-5 MiniLeader
SWE-bench Verified66.6%59.8%Claude Haiku 4.5
SWE-bench Multilingual64.7%39.7%Claude Haiku 4.5
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%86.6%GPT-5 Mini
SWE-bench Verified (Vals AI)66.6%60.8%Claude Haiku 4.5
Vibe Code Bench (Vals AI)11.4%14.2%GPT-5 Mini
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 measured83.8%Only GPT-5 Mini measured
SciCodeNot measured39.0%Only GPT-5 Mini measured
Terminal-Bench Hard (Artificial Analysis run)Not measured33.3%Only GPT-5 Mini measured
Terminal-Bench35.5%34.8%Claude Haiku 4.5
WeirdML45.4%52.7%GPT-5 Mini
LMArena Text: coding14541406Claude Haiku 4.5
LMArena Text: software and IT14391394Claude 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 index02
Intelligence benchmarks for Claude Haiku 4.5 and GPT-5 Mini
BenchmarkClaude Haiku 4.5GPT-5 MiniLeader
AA Intelligence Index16.920.6GPT-5 Mini
Epoch Capabilities Index142.2145.3GPT-5 Mini
Agentic workLike-for-likePublic boards, shown as published, kept out of the index20
Agentic work benchmarks for Claude Haiku 4.5 and GPT-5 Mini
BenchmarkClaude Haiku 4.5GPT-5 MiniLeader
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 measured71.1%Only GPT-5 Mini measured
BALROG31.2%Not measuredOnly Claude Haiku 4.5 measured
DeepResearch Bench45.5%Not measuredOnly Claude Haiku 4.5 measured
Vending-Bench 2$459-$31Claude Haiku 4.5
Berkeley Function Calling Leaderboard (BFCL)68.7%55.5%Claude Haiku 4.5
Neither model has a result on the other 28 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index36
Reasoning benchmarks for Claude Haiku 4.5 and GPT-5 Mini
BenchmarkClaude Haiku 4.5GPT-5 MiniLeader
GPQA Diamond72.2%80.3%GPT-5 Mini
LiveBench reasoning61.7%Not measuredOnly Claude Haiku 4.5 measured
MMMU Pro (Vals AI)46.1%78.9%GPT-5 Mini
GPQA Diamond (Artificial Analysis run)Not measured82.8%Only GPT-5 Mini measured
Humanity's Last Exam (Artificial Analysis run)Not measured21.5%Only GPT-5 Mini measured
GPQA Diamond (Epoch AI run)71.2%75.0%GPT-5 Mini
ARC-AGI47.7%54.3%GPT-5 Mini
ARC-AGI-24.0%4.4%GPT-5 Mini
Chess puzzles8.0%24.0%GPT-5 Mini
Mystery game puzzlesNot measured10.0%Only GPT-5 Mini measured
VPCTNot measured40.2%Only GPT-5 Mini measured
LMArena Text: hard prompts14211380Claude Haiku 4.5
LMArena Text: expert14431379Claude Haiku 4.5
LMArena Text: hard prompts in English14351383Claude Haiku 4.5
LMArena Vision: diagramsNot measured1202Only GPT-5 Mini measured
LMArena Vision: homeworkNot measured1210Only GPT-5 Mini measured
Kagi LLM BenchmarkNot measured70.3%Only GPT-5 Mini measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index24
Math benchmarks for Claude Haiku 4.5 and GPT-5 Mini
BenchmarkClaude Haiku 4.5GPT-5 MiniLeader
AIME82.7%91.5%GPT-5 Mini
MATH 500 (Vals AI)Not measured94.8%Only GPT-5 Mini measured
MGSM (Vals AI)92.2%92.6%GPT-5 Mini
AA Math IndexNot measured90.7Only GPT-5 Mini measured
AIME 2025 (Artificial Analysis run)Not measured90.7%Only GPT-5 Mini measured
OTIS Mock AIME66.7%86.7%GPT-5 Mini
FrontierMath, tiers 1 to 3Not measured46.7%Only GPT-5 Mini measured
FrontierMath, tier 4Not measured12.2%Only GPT-5 Mini measured
ProofBenchNot measured9.0%Only GPT-5 Mini measured
MATH level 596.4%97.8%GPT-5 Mini
LMArena Text: math13981378Claude Haiku 4.5
LMArena Text: mathematical work14301380Claude 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 index58
Knowledge benchmarks for Claude Haiku 4.5 and GPT-5 Mini
BenchmarkClaude Haiku 4.5GPT-5 MiniLeader
MMLU Pro78.7%82.2%GPT-5 Mini
LegalBench (Vals AI)81.2%81.8%GPT-5 Mini
CaseLaw (Vals AI)56.5%68.5%GPT-5 Mini
CorpFin (Vals AI)60.6%60.2%Claude Haiku 4.5
TaxEval (Vals AI)67.5%75.2%GPT-5 Mini
MortgageTax (Vals AI)62.2%66.9%GPT-5 Mini
MedQA (Vals AI)79.6%96.1%GPT-5 Mini
MedCode (Vals AI)32.7%43.0%GPT-5 Mini
MMLU Pro (Artificial Analysis run)Not measured83.7%Only GPT-5 Mini measured
SimpleQA Verified13.2%21.6%GPT-5 Mini
LMArena Text: science14061371Claude Haiku 4.5
LMArena Text: medicine and healthcare13941380Claude Haiku 4.5
LMArena Text: legal and government14001375Claude Haiku 4.5
LMArena Text: business and finance14001358Claude Haiku 4.5
FACTS Benchmark SuiteNot measured38.6%Only GPT-5 Mini measured
Neither model has a result on the other 3 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index25
Web design benchmarks for Claude Haiku 4.5 and GPT-5 Mini
BenchmarkClaude Haiku 4.5GPT-5 MiniLeader
Design Arena: websites11221125GPT-5 Mini
Design Arena: UI components10971103GPT-5 Mini
Design Arena: game dev10971129GPT-5 Mini
Design Arena: data viz11241131GPT-5 Mini
Design Arena: 3D10711036Claude Haiku 4.5
Design Arena: all code categories11141114Tie
Design Arena: SVG10251091GPT-5 Mini
Design Arena: ASCII art11401125Claude Haiku 4.5
LiveBench design59.9%Not measuredOnly Claude Haiku 4.5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index165
General benchmarks for Claude Haiku 4.5 and GPT-5 Mini
BenchmarkClaude Haiku 4.5GPT-5 MiniLeader
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%43.0%GPT-5 Mini
MedScribe (Vals AI)85.2%80.6%Claude Haiku 4.5
Vals Multimodal Index42.9%Not measuredOnly Claude Haiku 4.5 measured
IFBenchNot measured75.4%Only GPT-5 Mini measured
Long context reasoning (AA-LCR)Not measured72.3%Only GPT-5 Mini measured
DTBench73.6%80.5%GPT-5 Mini
LMCA30.9%34.2%GPT-5 Mini
Fiction.LiveBenchNot measured69.4%Only GPT-5 Mini measured
Creative writing (Lech Mazur)Not measured83.1%Only GPT-5 Mini measured
ExploitBench13.7%Not measuredOnly Claude Haiku 4.5 measured
LMArena Text13971373Claude Haiku 4.5
LMArena Text: instruction following14141357Claude Haiku 4.5
LMArena Text: creative writing13711325Claude Haiku 4.5
LMArena VisionNot measured1202Only GPT-5 Mini measured
LMArena Text: English14141379Claude Haiku 4.5
LMArena Text: non-English13771363Claude Haiku 4.5
LMArena Text: Chinese14181386Claude Haiku 4.5
LMArena Text: German13741366Claude Haiku 4.5
LMArena Text: Japanese13381341GPT-5 Mini
LMArena Text: Korean13461308Claude Haiku 4.5
LMArena Text: French14111386Claude Haiku 4.5
LMArena Text: Spanish14211354Claude Haiku 4.5
LMArena Text: Russian13811362Claude Haiku 4.5
LMArena Text: Polish13431378GPT-5 Mini
LMArena Text: multi-turn14091363Claude Haiku 4.5
LMArena Text: longer queries14271355Claude Haiku 4.5
LMArena Text: writing and language13861344Claude Haiku 4.5
LMArena Text: entertainment and media13691340Claude Haiku 4.5
LMArena Vision: EnglishNot measured1216Only GPT-5 Mini measured
LMArena Vision: ChineseNot measured1214Only GPT-5 Mini measured
LMArena Vision: reading textNot measured1199Only GPT-5 Mini measured
LMArena Vision: humorNot measured1205Only GPT-5 Mini measured
LMArena Vision: captioningNot measured1217Only GPT-5 Mini measured
LMArena Vision: recognizing thingsNot measured1226Only GPT-5 Mini measured
LMArena Vision: creative writingNot measured1181Only GPT-5 Mini measured
LMArena Document1420Not measuredOnly Claude Haiku 4.5 measured
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 Mini
BenchmarkClaude Haiku 4.5GPT-5 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 Haiku 4.5$0.0035Fits in one request
GPT-5 Mini$0.0013Fits in one request

GPT-5 Mini costs less

Repository review

50K input + 3K output tokens

Claude Haiku 4.5$0.065Fits in one request
GPT-5 Mini$0.018Fits in one request

GPT-5 Mini costs less

Agent loop

200K input + 10K output tokens

Claude Haiku 4.5$0.250Exceeds the context window
GPT-5 Mini$0.070Fits in one request

GPT-5 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 Haiku 4.5 and GPT-5 Mini
SpecificationAnthropic Claude Haiku 4.5OpenAI GPT-5 Mini
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedOctober 15, 2025August 7, 2025
Context window200K400K
Input $/Mtok$1.00$0.25
Output $/Mtok$5.00$2.00
Coding index35.634.2
Independent measurements behind it42
Cost per solved task$0.56$0.08
SourceOpenRouter listingOpenRouter listing

Questions

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

Claude Haiku 4.5 and GPT-5 Mini are level for coding, 35.6 against 34.2 on the Vibe Coding Index, so price and context decide. Pick GPT-5 Mini for output tokens 2.5x cheaper ($2.00 vs $5.00 per million) and a lower cost per solved task ($0.08 against $0.56). Pick Claude Haiku 4.5 for work measured by SWE-bench Verified or SWE-bench Multilingual, where it leads.

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

Claude Haiku 4.5 costs $1.00 per million input tokens and $5.00 per million output tokens; GPT-5 Mini costs $0.25 and $2.00. Per solved SWE-bench Verified task, Claude Haiku 4.5 costs $0.56 and GPT-5 Mini $0.08.

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

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

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

70 benchmarks have a result for both models as of October 22, 2026. Claude Haiku 4.5's coding index rests on 4 independent benchmarks and GPT-5 Mini's on 2. Where only one model has a result, the page says so instead of naming a winner.

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