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Claude Haiku 4.5 vs Qwen3.5-Flash

Updated October 21, 2026. 52 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 Qwen3.5-Flash
Claude Haiku 4.5Anthropic
Coding
49.8
Overall
16.9
Output $/M
$5.00
26
Qwen3.5-FlashQwen
Coding
6.2
Overall
No data
Output $/M
$0.26
26
vs boards won of 52 shared

Decision reading

Pick Claude Haiku 4.5 for coding: it scores 49.8 on the Vibe Coding Index against 6.2 for Qwen3.5-Flash.

Pick Qwen3.5-Flash when output tokens cost 19.2x less, or when a solved task costs $0.40 against $0.56.

Model AClaude Haiku 4.5Anthropic49.8/1003 independent benchmarks$0.56 per solved taskModel BQwen3.5-FlashQwen6.2/1001 independent benchmark$0.40 per solved task
Shared results
52
Claude Haiku 4.5 only
42
Qwen3.5-Flash only
3
Like-for-like categories
6 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, Qwen3.5-Flash 6.2 from 1 benchmark.
Widest category
Coding, 12.6 points apart on average over 7 shared benchmarks.
Widest single gap
LiveCodeBench (Vals AI): Claude Haiku 4.5 41.2% against Qwen3.5-Flash 83.3%, 42.1 points apart on a 0 to 100 scale.
Output price
Claude Haiku 4.5 $5.00 against Qwen3.5-Flash $0.26 per million output tokens, 19.2x apart.
Context window
Claude Haiku 4.5 takes 200K tokens, Qwen3.5-Flash 1M.

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 4.5BarsQwen3.5-FlashTies
Coding61
Intelligence01
Reasoning34
Math13
Knowledge39
General138
All shared boards2626
CodingLike-for-likeFour of these boards feed the Vibe Coding Index61
Coding benchmarks for Claude Haiku 4.5 and Qwen3.5-Flash
BenchmarkClaude Haiku 4.5Qwen3.5-FlashLeader
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 WebDev13301244Claude Haiku 4.5
AA Coding Index43.9Not measuredOnly Claude Haiku 4.5 measured
LiveCodeBench (Vals AI)41.2%83.3%Qwen3.5-Flash
SWE-bench Verified (Vals AI)66.6%64.4%Claude Haiku 4.5
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
Terminal-Bench35.5%Not measuredOnly Claude Haiku 4.5 measured
WeirdML45.4%Not measuredOnly Claude Haiku 4.5 measured
ALE-BenchNot measured265.9Only Qwen3.5-Flash measured
LMArena Text: coding14541412Claude Haiku 4.5
LMArena Text: software and IT14391416Claude Haiku 4.5
LMArena WebDev: React13261229Claude Haiku 4.5
LMArena WebDev: HTML13181291Claude Haiku 4.5
Neither model has a result on the other 20 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for Claude Haiku 4.5 and Qwen3.5-Flash
BenchmarkClaude Haiku 4.5Qwen3.5-FlashLeader
AA Intelligence Index16.9Not measuredOnly Claude Haiku 4.5 measured
Epoch Capabilities Index142.2143.5Qwen3.5-Flash
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index11 boards, none shared
Agentic work benchmarks for Claude Haiku 4.5 and Qwen3.5-Flash
BenchmarkClaude Haiku 4.5Qwen3.5-FlashLeader
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
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 28 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index34
Reasoning benchmarks for Claude Haiku 4.5 and Qwen3.5-Flash
BenchmarkClaude Haiku 4.5Qwen3.5-FlashLeader
GPQA Diamond72.2%82.8%Qwen3.5-Flash
LiveBench reasoning61.7%Not measuredOnly Claude Haiku 4.5 measured
MMMU Pro (Vals AI)46.1%81.9%Qwen3.5-Flash
GPQA Diamond (Epoch AI run)71.2%82.3%Qwen3.5-Flash
ARC-AGI47.7%Not measuredOnly Claude Haiku 4.5 measured
ARC-AGI-24.0%Not measuredOnly Claude Haiku 4.5 measured
Chess puzzles8.0%14.0%Qwen3.5-Flash
Mystery game puzzlesNot measured20.0%Only Qwen3.5-Flash measured
LMArena Text: hard prompts14211403Claude Haiku 4.5
LMArena Text: expert14431407Claude Haiku 4.5
LMArena Text: hard prompts in English14351409Claude Haiku 4.5
Neither model has a result on the other 10 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index13
Math benchmarks for Claude Haiku 4.5 and Qwen3.5-Flash
BenchmarkClaude Haiku 4.5Qwen3.5-FlashLeader
AIME82.7%92.5%Qwen3.5-Flash
MGSM (Vals AI)92.2%Not measuredOnly Claude Haiku 4.5 measured
OTIS Mock AIME66.7%84.4%Qwen3.5-Flash
FrontierMath, tiers 1 to 3Not measured18.2%Only Qwen3.5-Flash measured
MATH level 596.4%Not measuredOnly Claude Haiku 4.5 measured
LMArena Text: math13981407Qwen3.5-Flash
LMArena Text: mathematical work14301413Claude Haiku 4.5
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index39
Knowledge benchmarks for Claude Haiku 4.5 and Qwen3.5-Flash
BenchmarkClaude Haiku 4.5Qwen3.5-FlashLeader
MMLU Pro78.7%84.1%Qwen3.5-Flash
LegalBench (Vals AI)81.2%84.3%Qwen3.5-Flash
CaseLaw (Vals AI)56.5%56.0%Claude Haiku 4.5
CorpFin (Vals AI)60.6%63.6%Qwen3.5-Flash
TaxEval (Vals AI)67.5%72.2%Qwen3.5-Flash
MortgageTax (Vals AI)62.2%67.4%Qwen3.5-Flash
MedQA (Vals AI)79.6%Not measuredOnly Claude Haiku 4.5 measured
MedCode (Vals AI)32.7%33.0%Qwen3.5-Flash
SimpleQA Verified13.2%20.3%Qwen3.5-Flash
LMArena Text: science14061415Qwen3.5-Flash
LMArena Text: medicine and healthcare13941407Qwen3.5-Flash
LMArena Text: legal and government14001398Claude Haiku 4.5
LMArena Text: business and finance14001394Claude Haiku 4.5
Neither model has a result on the other 4 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index9 boards, none shared
Web design benchmarks for Claude Haiku 4.5 and Qwen3.5-Flash
BenchmarkClaude Haiku 4.5Qwen3.5-FlashLeader
Design Arena: websites1122Not measuredOnly Claude Haiku 4.5 measured
Design Arena: UI components1100Not measuredOnly Claude Haiku 4.5 measured
Design Arena: game dev1097Not measuredOnly Claude Haiku 4.5 measured
Design Arena: data viz1124Not measuredOnly Claude Haiku 4.5 measured
Design Arena: 3D1072Not measuredOnly Claude Haiku 4.5 measured
Design Arena: all code categories1115Not measuredOnly Claude Haiku 4.5 measured
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 index138
General benchmarks for Claude Haiku 4.5 and Qwen3.5-Flash
BenchmarkClaude Haiku 4.5Qwen3.5-FlashLeader
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%42.5%Qwen3.5-Flash
MedScribe (Vals AI)85.2%70.6%Claude Haiku 4.5
Vals Multimodal Index42.9%Not measuredOnly Claude Haiku 4.5 measured
DTBench73.6%82.9%Qwen3.5-Flash
LMCA30.9%29.1%Claude Haiku 4.5
ExploitBench13.7%Not measuredOnly Claude Haiku 4.5 measured
LMArena Text13971397Claude Haiku 4.5
LMArena Text: instruction following14141374Claude Haiku 4.5
LMArena Text: creative writing13711343Claude Haiku 4.5
LMArena Text: English14141404Claude Haiku 4.5
LMArena Text: non-English13771385Qwen3.5-Flash
LMArena Text: Chinese14181445Qwen3.5-Flash
LMArena Text: German13741390Qwen3.5-Flash
LMArena Text: Japanese13381369Qwen3.5-Flash
LMArena Text: Korean13461344Claude Haiku 4.5
LMArena Text: French14111413Qwen3.5-Flash
LMArena Text: Spanish14211400Claude Haiku 4.5
LMArena Text: Russian13811380Claude Haiku 4.5
LMArena Text: Polish13431376Qwen3.5-Flash
LMArena Text: multi-turn14091393Claude Haiku 4.5
LMArena Text: longer queries14271392Claude Haiku 4.5
LMArena Text: writing and language13861369Claude Haiku 4.5
LMArena Text: entertainment and media13691347Claude Haiku 4.5
LMArena Document1420Not measuredOnly Claude Haiku 4.5 measured
Neither model has a result on the other 20 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 Qwen3.5-Flash
BenchmarkClaude Haiku 4.5Qwen3.5-FlashLeader
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
Qwen3.5-Flash$0.0002Fits in one request

Qwen3.5-Flash costs less

Repository review

50K input + 3K output tokens

Claude Haiku 4.5$0.065Fits in one request
Qwen3.5-Flash$0.0040Fits in one request

Qwen3.5-Flash costs less

Agent loop

200K input + 10K output tokens

Claude Haiku 4.5$0.250Exceeds the context window
Qwen3.5-Flash$0.016Fits in one request

Qwen3.5-Flash 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 Qwen3.5-Flash
SpecificationAnthropic Claude Haiku 4.5Qwen3.5-Flash
MakerAnthropicQwen
WeightsNo public weights listedNo public weights listed
ReleasedOctober 15, 2025February 25, 2026
Context window200K1M
Input $/Mtok$1.00$0.065
Output $/Mtok$5.00$0.26
Coding index49.86.2
Independent measurements behind it31
Cost per solved task$0.56$0.40
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Haiku 4.5 better than Qwen3.5-Flash for coding?

Pick Claude Haiku 4.5 for coding: it scores 49.8 on the Vibe Coding Index against 6.2 for Qwen3.5-Flash. Pick Qwen3.5-Flash when output tokens cost 19.2x less, or when a solved task costs $0.40 against $0.56.

Which is cheaper, Claude Haiku 4.5 or Qwen3.5-Flash?

Claude Haiku 4.5 costs $1.00 per million input tokens and $5.00 per million output tokens; Qwen3.5-Flash costs $0.065 and $0.26. Per solved SWE-bench Verified task, Claude Haiku 4.5 costs $0.56 and Qwen3.5-Flash $0.40.

Which has the bigger context window, Claude Haiku 4.5 or Qwen3.5-Flash?

Qwen3.5-Flash, with 1M tokens against 200K.

How many benchmarks is the Claude Haiku 4.5 vs Qwen3.5-Flash comparison based on?

52 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 Qwen3.5-Flash's on 1. Where only one model has a result, the page says so instead of naming a winner.

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