Claude Haiku 4.5 vs Qwen3.5 Plus 2026-04-20

Qwen3.5 Plus 2026-04-20 leads Claude Haiku 4.5 on coding, 39.5 to 35.6 on the Vibe Coding Index, and Qwen3.5 Plus 2026-04-20 costs 2.8x less per output token ($1.80 vs $5.00 per million). Updated October 22, 2026; 21 benchmarks have a result for both.

Replace Claude Haiku 4.5 Replace Qwen3.5 Plus 2026-04-20

Claude Haiku 4.5Anthropic

Coding: 35.6
Overall: 41.0
Output $/M: $5.00

Qwen3.5 Plus 2026-04-20Qwen

Coding: 39.5
Overall: No data
Output $/M: $1.80

vs boards won of 21 shared, 1 tied

Claude Haiku 4.5 or Qwen3.5 Plus 2026-04-20: which to pick

Pick Qwen3.5 Plus 2026-04-20 for coding: it scores 39.5 on the Vibe Coding Index against 35.6 for Claude Haiku 4.5, though on 2 benchmarks against 4.

Pick Claude Haiku 4.5 for a lower cost per solved task ($0.56 against $1.35) and work measured by Vending-Bench 2 or MMMU Pro (Vals AI), where it leads.

Model AClaude Haiku 4.5Anthropic35.6/1004 independent benchmarks$0.56 per solved task Model BQwen3.5 Plus 2026-04-20Qwen39.5/1002 independent benchmarks$1.35 per solved task

21774

Shared results: 21
Claude Haiku 4.5 only: 77
Qwen3.5 Plus 2026-04-20 only: 4
Like-for-like categories: 7 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.

Coding
Vibe Coding Index, six public coding benchmarks
Qwen3.5 Plus 2026-04-20
Qwen3.5 Plus 2026-04-20 scores 39.5 against 35.6.
4 and 2 benchmarks behind the scores
Intelligence
AA Intelligence Index
No call
Only Claude Haiku 4.5 has a AA Intelligence Index result, 16.9.
Directional only
Agentic work
AA Agentic Index
No call
Only Claude Haiku 4.5 has a AA Agentic Index result, 8.0.
Directional only
Reasoning
GPQA Diamond
Qwen3.5 Plus 2026-04-20
Qwen3.5 Plus 2026-04-20 leads, 87.4% against 72.2%.
Same board, both measured
Math
AIME
Qwen3.5 Plus 2026-04-20
Qwen3.5 Plus 2026-04-20 leads, 86.0% against 82.7%.
Same board, both measured
Knowledge
MMLU Pro
Qwen3.5 Plus 2026-04-20
Qwen3.5 Plus 2026-04-20 leads, 87.2% against 78.7%.
Same board, both measured
Web design
Design Arena: websites
No call
Only Claude Haiku 4.5 has a Design Arena: websites result, 1122.
Directional only
Long documents
Listed context window
Qwen3.5 Plus 2026-04-20
Qwen3.5 Plus 2026-04-20 takes 1M tokens against 200K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Qwen3.5 Plus 2026-04-20
Claude Haiku 4.5 $0.0035, Qwen3.5 Plus 2026-04-20 $0.0012 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
Claude Haiku 4.5
Claude Haiku 4.5 $0.56, Qwen3.5 Plus 2026-04-20 $1.35.
Published attempt cost and pass rate

At a glance

Coding index: Claude Haiku 4.5 35.6 from 4 benchmarks, Qwen3.5 Plus 2026-04-20 39.5 from 2 benchmarks.
Widest category: Coding, 17.7 points apart on average over 3 shared benchmarks.
Widest single gap: LiveCodeBench (Vals AI): Claude Haiku 4.5 41.2% against Qwen3.5 Plus 2026-04-20 85.3%, 44.2 points apart on a 0 to 100 scale.
Output price: Claude Haiku 4.5 $5.00 against Qwen3.5 Plus 2026-04-20 $1.80 per million output tokens, 2.8x apart.
Context window: Claude Haiku 4.5 takes 200K tokens, Qwen3.5 Plus 2026-04-20 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
Category	Claude Haiku 4.5	Qwen3.5 Plus 2026-04-20	Ties
Coding	0	3
Intelligence	0	1
Agentic work	1	0
Reasoning	1	2	1 tie
Math	0	2
Knowledge	1	6
General	1	2
All shared boards	4	16	1 tie

CodingLike-for-likeSix of these boards feed the Vibe Coding Index03

Coding benchmarks for Claude Haiku 4.5 and Qwen3.5 Plus 2026-04-20
Benchmark	Claude Haiku 4.5	Qwen3.5 Plus 2026-04-20	Leader
SWE-bench Verified	66.6%	Not measured	Only Claude Haiku 4.5 measured
SWE-bench Multilingual	64.7%	Not measured	Only Claude Haiku 4.5 measured
LiveBench coding	48.1%	Not measured	Only Claude Haiku 4.5 measured
LMArena WebDev	1330	Not measured	Only Claude Haiku 4.5 measured
AA Coding Index	43.9	Not measured	Only Claude Haiku 4.5 measured
LiveCodeBench (Vals AI)	41.2%	85.3%	Qwen3.5 Plus 2026-04-20
SWE-bench Verified (Vals AI)	66.6%	71.2%	Qwen3.5 Plus 2026-04-20
Vibe Code Bench (Vals AI)	11.4%	15.7%	Qwen3.5 Plus 2026-04-20
Code migration (Vals AI)	7.5%	Not measured	Only Claude Haiku 4.5 measured
ProgramBench (Vals AI)	0.0%	Not measured	Only Claude Haiku 4.5 measured
Terminal-Bench 2.1 (Vals AI)	43.8%	Not measured	Only Claude Haiku 4.5 measured
Terminal-Bench	35.5%	Not measured	Only Claude Haiku 4.5 measured
WeirdML	45.4%	Not measured	Only Claude Haiku 4.5 measured
ALE-Bench	Not measured	608.9	Only Qwen3.5 Plus 2026-04-20 measured
LMArena Text: coding	1454	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: software and IT	1439	Not measured	Only Claude Haiku 4.5 measured
LMArena WebDev: React	1326	Not measured	Only Claude Haiku 4.5 measured
LMArena WebDev: HTML	1318	Not measured	Only Claude Haiku 4.5 measured
Neither model has a result on the other 25 boards here

IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01

Intelligence benchmarks for Claude Haiku 4.5 and Qwen3.5 Plus 2026-04-20
Benchmark	Claude Haiku 4.5	Qwen3.5 Plus 2026-04-20	Leader
AA Intelligence Index	16.9	Not measured	Only Claude Haiku 4.5 measured
Epoch Capabilities Index	142.2	146.2	Qwen3.5 Plus 2026-04-20

Agentic workLike-for-likePublic boards, shown as published, kept out of the index10

Agentic work benchmarks for Claude Haiku 4.5 and Qwen3.5 Plus 2026-04-20
Benchmark	Claude Haiku 4.5	Qwen3.5 Plus 2026-04-20	Leader
AA Agentic Index	8.0	Not measured	Only Claude Haiku 4.5 measured
LiveBench research	42.2%	Not measured	Only Claude Haiku 4.5 measured
LiveBench browser	40.0%	Not measured	Only Claude Haiku 4.5 measured
LiveBench long agentic	11.1%	Not measured	Only Claude Haiku 4.5 measured
Finance Agent (Vals AI)	31.0%	Not measured	Only Claude Haiku 4.5 measured
Tax Agent Bench (Vals AI)	5.9%	Not measured	Only Claude Haiku 4.5 measured
Legal Research Bench (Vals AI)	10.6%	Not measured	Only Claude Haiku 4.5 measured
Excel Modeling Benchmark (Vals AI)	22.7%	Not measured	Only Claude Haiku 4.5 measured
BALROG	31.2%	Not measured	Only Claude Haiku 4.5 measured
DeepResearch Bench	45.5%	Not measured	Only Claude Haiku 4.5 measured
Vending-Bench 2	$459	$1	Claude Haiku 4.5
Berkeley Function Calling Leaderboard (BFCL)	68.7%	Not measured	Only Claude Haiku 4.5 measured
MCP Atlas	40.2%	Not measured	Only Claude Haiku 4.5 measured
Neither model has a result on the other 29 boards here

ReasoningLike-for-likePublic boards, shown as published, kept out of the index12

Reasoning benchmarks for Claude Haiku 4.5 and Qwen3.5 Plus 2026-04-20
Benchmark	Claude Haiku 4.5	Qwen3.5 Plus 2026-04-20	Leader
GPQA Diamond	72.2%	87.4%	Qwen3.5 Plus 2026-04-20
LiveBench reasoning	61.7%	Not measured	Only Claude Haiku 4.5 measured
MMMU Pro (Vals AI)	46.1%	22.8%	Claude Haiku 4.5
GPQA Diamond (Epoch AI run)	71.2%	84.8%	Qwen3.5 Plus 2026-04-20
ARC-AGI	47.7%	Not measured	Only Claude Haiku 4.5 measured
ARC-AGI-2	4.0%	Not measured	Only Claude Haiku 4.5 measured
Chess puzzles	8.0%	8.0%	Tie
Mystery game puzzles	Not measured	17.0%	Only Qwen3.5 Plus 2026-04-20 measured
LMArena Text: hard prompts	1421	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: expert	1443	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: hard prompts in English	1435	Not measured	Only Claude Haiku 4.5 measured
Neither model has a result on the other 12 boards here

MathLike-for-likePublic boards, shown as published, kept out of the index02

Math benchmarks for Claude Haiku 4.5 and Qwen3.5 Plus 2026-04-20
Benchmark	Claude Haiku 4.5	Qwen3.5 Plus 2026-04-20	Leader
AIME	82.7%	86.0%	Qwen3.5 Plus 2026-04-20
MGSM (Vals AI)	92.2%	Not measured	Only Claude Haiku 4.5 measured
OTIS Mock AIME	66.7%	86.7%	Qwen3.5 Plus 2026-04-20
MATH level 5	96.4%	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: math	1398	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: mathematical work	1430	Not measured	Only Claude Haiku 4.5 measured
Neither model has a result on the other 8 boards here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index16

Knowledge benchmarks for Claude Haiku 4.5 and Qwen3.5 Plus 2026-04-20
Benchmark	Claude Haiku 4.5	Qwen3.5 Plus 2026-04-20	Leader
MMLU Pro	78.7%	87.2%	Qwen3.5 Plus 2026-04-20
LegalBench (Vals AI)	81.2%	85.1%	Qwen3.5 Plus 2026-04-20
CaseLaw (Vals AI)	56.5%	59.7%	Qwen3.5 Plus 2026-04-20
CorpFin (Vals AI)	60.6%	65.3%	Qwen3.5 Plus 2026-04-20
TaxEval (Vals AI)	67.5%	Not measured	Only Claude Haiku 4.5 measured
MortgageTax (Vals AI)	62.2%	60.8%	Claude Haiku 4.5
MedQA (Vals AI)	79.6%	95.2%	Qwen3.5 Plus 2026-04-20
MedCode (Vals AI)	32.7%	Not measured	Only Claude Haiku 4.5 measured
SimpleQA Verified	13.2%	25.4%	Qwen3.5 Plus 2026-04-20
LMArena Text: science	1406	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: medicine and healthcare	1394	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: legal and government	1400	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: business and finance	1400	Not measured	Only Claude Haiku 4.5 measured
Neither model has a result on the other 7 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 Plus 2026-04-20
Benchmark	Claude Haiku 4.5	Qwen3.5 Plus 2026-04-20	Leader
Design Arena: websites	1122	Not measured	Only Claude Haiku 4.5 measured
Design Arena: UI components	1097	Not measured	Only Claude Haiku 4.5 measured
Design Arena: game dev	1096	Not measured	Only Claude Haiku 4.5 measured
Design Arena: data viz	1124	Not measured	Only Claude Haiku 4.5 measured
Design Arena: 3D	1071	Not measured	Only Claude Haiku 4.5 measured
Design Arena: all code categories	1114	Not measured	Only Claude Haiku 4.5 measured
Design Arena: SVG	1025	Not measured	Only Claude Haiku 4.5 measured
Design Arena: ASCII art	1140	Not measured	Only Claude Haiku 4.5 measured
LiveBench design	59.9%	Not measured	Only Claude Haiku 4.5 measured

GeneralLike-for-likePublic boards, shown as published, kept out of the index12

General benchmarks for Claude Haiku 4.5 and Qwen3.5 Plus 2026-04-20
Benchmark	Claude Haiku 4.5	Qwen3.5 Plus 2026-04-20	Leader
LiveBench data analysis	59.3%	Not measured	Only Claude Haiku 4.5 measured
Public Benefits Bench (Vals AI)	54.3%	Not measured	Only Claude Haiku 4.5 measured
SAGE (Vals AI)	31.8%	30.4%	Claude Haiku 4.5
MedScribe (Vals AI)	85.2%	Not measured	Only Claude Haiku 4.5 measured
Vals Multimodal Index	42.9%	Not measured	Only Claude Haiku 4.5 measured
DTBench	73.6%	80.5%	Qwen3.5 Plus 2026-04-20
LMCA	30.9%	36.4%	Qwen3.5 Plus 2026-04-20
CL-bench	Not measured	19.8%	Only Qwen3.5 Plus 2026-04-20 measured
ExploitBench	13.7%	Not measured	Only Claude Haiku 4.5 measured
CL-bench Life	Not measured	12.4%	Only Qwen3.5 Plus 2026-04-20 measured
LMArena Text	1397	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: instruction following	1414	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: creative writing	1371	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: English	1414	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: non-English	1377	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: Chinese	1418	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: German	1374	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: Japanese	1338	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: Korean	1346	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: French	1411	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: Spanish	1421	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: Russian	1381	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: Polish	1343	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: multi-turn	1409	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: longer queries	1427	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: writing and language	1386	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: entertainment and media	1369	Not measured	Only Claude Haiku 4.5 measured
LMArena Document	1420	Not measured	Only Claude Haiku 4.5 measured
MultiChallenge	50.5%	Not measured	Only Claude Haiku 4.5 measured
EQ-Bench 4	1064	Not measured	Only Claude Haiku 4.5 measured
Neither model has a result on the other 18 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 Plus 2026-04-20
Benchmark	Claude Haiku 4.5	Qwen3.5 Plus 2026-04-20	Leader
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 Plus 2026-04-20$0.0012Fits in one request

Qwen3.5 Plus 2026-04-20 costs less

Repository review

50K input + 3K output tokens

Claude Haiku 4.5$0.065Fits in one request

Qwen3.5 Plus 2026-04-20$0.020Fits in one request

Qwen3.5 Plus 2026-04-20 costs less

Agent loop

200K input + 10K output tokens

Claude Haiku 4.5$0.250Exceeds the context window

Qwen3.5 Plus 2026-04-20$0.078Fits in one request

Qwen3.5 Plus 2026-04-20 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 Plus 2026-04-20
Specification	Anthropic Claude Haiku 4.5	Qwen3.5 Plus 2026-04-20
Maker	Anthropic	Qwen
Weights	No public weights listed	No public weights listed
Released	October 15, 2025	April 27, 2026
Context window	200K	1M
Input $/Mtok	$1.00	$0.30
Output $/Mtok	$5.00	$1.80
Coding index	35.6	39.5
Independent measurements behind it	4	2
Cost per solved task	$0.56	$1.35
Source	OpenRouter listing	OpenRouter listing

Questions

Is Claude Haiku 4.5 better than Qwen3.5 Plus 2026-04-20 for coding?

Pick Qwen3.5 Plus 2026-04-20 for coding: it scores 39.5 on the Vibe Coding Index against 35.6 for Claude Haiku 4.5, though on 2 benchmarks against 4. Pick Claude Haiku 4.5 for a lower cost per solved task ($0.56 against $1.35) and work measured by Vending-Bench 2 or MMMU Pro (Vals AI), where it leads.

Which is cheaper, Claude Haiku 4.5 or Qwen3.5 Plus 2026-04-20?

Claude Haiku 4.5 costs $1.00 per million input tokens and $5.00 per million output tokens; Qwen3.5 Plus 2026-04-20 costs $0.30 and $1.80. Per solved SWE-bench Verified task, Claude Haiku 4.5 costs $0.56 and Qwen3.5 Plus 2026-04-20 $1.35.

Which has the bigger context window, Claude Haiku 4.5 or Qwen3.5 Plus 2026-04-20?

Qwen3.5 Plus 2026-04-20, with 1M tokens against 200K.

How many benchmarks is the Claude Haiku 4.5 vs Qwen3.5 Plus 2026-04-20 comparison based on?

21 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 Qwen3.5 Plus 2026-04-20's on 2. Where only one model has a result, the page says so instead of naming a winner.

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Claude Haiku 4.5 or Qwen3.5 Plus 2026-04-20: which to pick

Which one for your work

Coding

Intelligence

Agentic work

Reasoning

Math

Knowledge

Web design

Long documents

Everyday cost

Cost per solved task

At a glance

Benchmark by benchmark

What each workload costs

Chat turn

Repository review

Agent loop

Specification differences

Questions

Compare next