Claude Opus 4.5 vs Qwen3.5-Flash

Claude Opus 4.5 leads Qwen3.5-Flash on coding, 44.0 to 41.1 on the Vibe Coding Index, and Qwen3.5-Flash costs 96.2x less per output token ($0.26 vs $25.00 per million). Updated October 22, 2026; 54 benchmarks have a result for both.

Replace Claude Opus 4.5 Replace Qwen3.5-Flash

Claude Opus 4.5Anthropic

Coding: 44.0
Overall: 55.7
Output $/M: $25.00

Qwen3.5-FlashQwen

Coding: 41.1
Overall: 50.1
Output $/M: $0.26

vs boards won of 54 shared, 1 tied

Claude Opus 4.5 or Qwen3.5-Flash: which to pick

Pick Claude Opus 4.5 for coding: it scores 44.0 on the Vibe Coding Index against 41.1 for Qwen3.5-Flash.

Pick Qwen3.5-Flash for output tokens 96.2x cheaper ($0.26 vs $25.00 per million) and a lower cost per solved task ($0.40 against $1.37).

Model AClaude Opus 4.5Anthropic44.0/1003 independent benchmarks$1.37 per solved task Model BQwen3.5-FlashQwen41.1/1002 independent benchmarks$0.40 per solved task

54581

Shared results: 54
Claude Opus 4.5 only: 58
Qwen3.5-Flash only: 1
Like-for-like categories: 6 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
Claude Opus 4.5
Claude Opus 4.5 scores 44.0 against 41.1.
3 and 2 benchmarks behind the scores
Intelligence
AA Intelligence Index
No call
Only Claude Opus 4.5 has a AA Intelligence Index result, 29.1.
Directional only
Reasoning
GPQA Diamond
Claude Opus 4.5
Claude Opus 4.5 leads, 85.9% against 82.8%.
Same board, both measured
Math
AIME
Claude Opus 4.5
Claude Opus 4.5 leads, 95.4% against 92.5%.
Same board, both measured
Knowledge
MMLU Pro
Claude Opus 4.5
Claude Opus 4.5 leads, 87.3% against 84.1%.
Same board, both measured
Web design
Design Arena: websites
No call
Only Claude Opus 4.5 has a Design Arena: websites result, 1247.
Directional only
Long documents
Listed context window
Qwen3.5-Flash
Qwen3.5-Flash takes 1M tokens against 200K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Qwen3.5-Flash
Claude Opus 4.5 $0.018, Qwen3.5-Flash $0.0002 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
Qwen3.5-Flash
Claude Opus 4.5 $1.37, Qwen3.5-Flash $0.40.
Published attempt cost and pass rate

At a glance

Coding index: Claude Opus 4.5 44.0 from 3 benchmarks, Qwen3.5-Flash 41.1 from 2 benchmarks.
Widest category: Coding, 21.8 points apart on average over 7 shared benchmarks.
Widest single gap: LMArena WebDev: React: Claude Opus 4.5 1478 against Qwen3.5-Flash 1229, 41.5 points apart on a 0 to 100 scale.
Output price: Claude Opus 4.5 $25.00 against Qwen3.5-Flash $0.26 per million output tokens, 96.2x apart.
Context window: Claude Opus 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
Category	Claude Opus 4.5	Ties
Coding	7
Intelligence	1
Reasoning	7	1 tie
Math	5
Knowledge	12
General	21
All shared boards	53	1 tie

CodingLike-for-likeSix of these boards feed the Vibe Coding Index70

Coding benchmarks for Claude Opus 4.5 and Qwen3.5-Flash
Benchmark	Claude Opus 4.5	Qwen3.5-Flash	Leader
SWE-bench Verified	79.2%	Not measured	Only Claude Opus 4.5 measured
SWE-bench (full test set)	52.6%	Not measured	Only Claude Opus 4.5 measured
SWE-bench Multilingual	70.7%	Not measured	Only Claude Opus 4.5 measured
LMArena WebDev	1494	1244	Claude Opus 4.5
LiveCodeBench (Vals AI)	83.7%	83.3%	Claude Opus 4.5
SWE-bench Verified (Vals AI)	76.4%	64.4%	Claude Opus 4.5
Vibe Code Bench (Vals AI)	20.6%	Not measured	Only Claude Opus 4.5 measured
LiveCodeBench (Artificial Analysis run)	87.1%	Not measured	Only Claude Opus 4.5 measured
Terminal-Bench Hard (Artificial Analysis run)	47.0%	Not measured	Only Claude Opus 4.5 measured
Terminal-Bench	63.1%	Not measured	Only Claude Opus 4.5 measured
GSO-Bench	26.5%	Not measured	Only Claude Opus 4.5 measured
WeirdML	63.7%	Not measured	Only Claude Opus 4.5 measured
Cybench	82.0%	Not measured	Only Claude Opus 4.5 measured
ALE-Bench	Not measured	265.9	Only Qwen3.5-Flash measured
LMArena Text: coding	1503	1412	Claude Opus 4.5
LMArena Text: software and IT	1483	1416	Claude Opus 4.5
LMArena WebDev: React	1478	1229	Claude Opus 4.5
LMArena WebDev: HTML	1510	1291	Claude Opus 4.5
Neither model has a result on the other 25 boards here

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

Intelligence benchmarks for Claude Opus 4.5 and Qwen3.5-Flash
Benchmark	Claude Opus 4.5	Qwen3.5-Flash	Leader
AA Intelligence Index	29.1	Not measured	Only Claude Opus 4.5 measured
Epoch Capabilities Index	150.1	143.5	Claude Opus 4.5

Agentic workDirectional onlyPublic boards, shown as published, kept out of the index14 boards, none shared

Agentic work benchmarks for Claude Opus 4.5 and Qwen3.5-Flash
Benchmark	Claude Opus 4.5	Qwen3.5-Flash	Leader
Design Arena: agents building web apps	1159	Not measured	Only Claude Opus 4.5 measured
Design Arena: agents building full-stack apps	1156	Not measured	Only Claude Opus 4.5 measured
Design Arena: agents building mobile apps	1188	Not measured	Only Claude Opus 4.5 measured
Design Arena: agents building Android apps	1176	Not measured	Only Claude Opus 4.5 measured
τ²-Bench Telecom	89.5%	Not measured	Only Claude Opus 4.5 measured
METR time horizons	75.0%	Not measured	Only Claude Opus 4.5 measured
Remote Labor Index	3.8%	Not measured	Only Claude Opus 4.5 measured
GDPval	45.5%	Not measured	Only Claude Opus 4.5 measured
BALROG	43.5%	Not measured	Only Claude Opus 4.5 measured
DeepResearch Bench	54.8%	Not measured	Only Claude Opus 4.5 measured
OSWorld	66.3%	Not measured	Only Claude Opus 4.5 measured
Vending-Bench 2	$4,967	Not measured	Only Claude Opus 4.5 measured
Berkeley Function Calling Leaderboard (BFCL)	77.5%	Not measured	Only Claude Opus 4.5 measured
MCP Atlas	69.8%	Not measured	Only Claude Opus 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 index70

Reasoning benchmarks for Claude Opus 4.5 and Qwen3.5-Flash
Benchmark	Claude Opus 4.5	Qwen3.5-Flash	Leader
GPQA Diamond	85.9%	82.8%	Claude Opus 4.5
MMMU Pro (Vals AI)	83.0%	81.9%	Claude Opus 4.5
GPQA Diamond (Artificial Analysis run)	86.6%	Not measured	Only Claude Opus 4.5 measured
Humanity's Last Exam (Artificial Analysis run)	30.1%	Not measured	Only Claude Opus 4.5 measured
GPQA Diamond (Epoch AI run)	86.0%	82.3%	Claude Opus 4.5
ARC-AGI	80.0%	Not measured	Only Claude Opus 4.5 measured
ARC-AGI-2	37.6%	Not measured	Only Claude Opus 4.5 measured
SimpleBench	62.0%	Not measured	Only Claude Opus 4.5 measured
Chess puzzles	14.0%	14.0%	Tie
Mystery game puzzles	22.0%	20.0%	Claude Opus 4.5
EBR-bench	14.3%	Not measured	Only Claude Opus 4.5 measured
VPCT	40.0%	Not measured	Only Claude Opus 4.5 measured
LMArena Text: hard prompts	1476	1403	Claude Opus 4.5
LMArena Text: expert	1487	1407	Claude Opus 4.5
LMArena Text: hard prompts in English	1482	1409	Claude Opus 4.5
Kagi LLM Benchmark	80.2%	Not measured	Only Claude Opus 4.5 measured
Neither model has a result on the other 7 boards here

MathLike-for-likePublic boards, shown as published, kept out of the index50

Math benchmarks for Claude Opus 4.5 and Qwen3.5-Flash
Benchmark	Claude Opus 4.5	Qwen3.5-Flash	Leader
AIME	95.4%	92.5%	Claude Opus 4.5
MGSM (Vals AI)	95.2%	Not measured	Only Claude Opus 4.5 measured
AA Math Index	91.3	Not measured	Only Claude Opus 4.5 measured
AIME 2025 (Artificial Analysis run)	91.3%	Not measured	Only Claude Opus 4.5 measured
OTIS Mock AIME	86.1%	84.4%	Claude Opus 4.5
FrontierMath, tiers 1 to 3	34.4%	18.2%	Claude Opus 4.5
FrontierMath, tier 4	4.9%	Not measured	Only Claude Opus 4.5 measured
ProofBench	36.0%	Not measured	Only Claude Opus 4.5 measured
LMArena Text: math	1463	1407	Claude Opus 4.5
LMArena Text: mathematical work	1468	1413	Claude Opus 4.5
Neither model has a result on the other 4 boards here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index120

Knowledge benchmarks for Claude Opus 4.5 and Qwen3.5-Flash
Benchmark	Claude Opus 4.5	Qwen3.5-Flash	Leader
MMLU Pro	87.3%	84.1%	Claude Opus 4.5
LegalBench (Vals AI)	84.6%	84.3%	Claude Opus 4.5
CaseLaw (Vals AI)	62.6%	56.0%	Claude Opus 4.5
CorpFin (Vals AI)	65.1%	63.6%	Claude Opus 4.5
TaxEval (Vals AI)	74.9%	72.2%	Claude Opus 4.5
MortgageTax (Vals AI)	68.7%	67.4%	Claude Opus 4.5
MedQA (Vals AI)	95.9%	Not measured	Only Claude Opus 4.5 measured
MedCode (Vals AI)	49.2%	33.0%	Claude Opus 4.5
MMLU Pro (Artificial Analysis run)	89.5%	Not measured	Only Claude Opus 4.5 measured
SimpleQA Verified	45.7%	20.3%	Claude Opus 4.5
GeoBench	75.0%	Not measured	Only Claude Opus 4.5 measured
LMArena Text: science	1454	1415	Claude Opus 4.5
LMArena Text: medicine and healthcare	1444	1407	Claude Opus 4.5
LMArena Text: legal and government	1459	1398	Claude Opus 4.5
LMArena Text: business and finance	1448	1394	Claude Opus 4.5
FACTS Benchmark Suite	43.9%	Not measured	Only Claude Opus 4.5 measured
PRBench Finance	46.2%	Not measured	Only Claude Opus 4.5 measured
PRBench Legal	44.2%	Not measured	Only Claude Opus 4.5 measured
Neither model has a result on the other 2 boards here

Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared

Web design benchmarks for Claude Opus 4.5 and Qwen3.5-Flash
Benchmark	Claude Opus 4.5	Qwen3.5-Flash	Leader
Design Arena: websites	1247	Not measured	Only Claude Opus 4.5 measured
Design Arena: UI components	1236	Not measured	Only Claude Opus 4.5 measured
Design Arena: game dev	1228	Not measured	Only Claude Opus 4.5 measured
Design Arena: data viz	1243	Not measured	Only Claude Opus 4.5 measured
Design Arena: 3D	1213	Not measured	Only Claude Opus 4.5 measured
Design Arena: all code categories	1241	Not measured	Only Claude Opus 4.5 measured
Design Arena: SVG	1180	Not measured	Only Claude Opus 4.5 measured
Design Arena: ASCII art	1190	Not measured	Only Claude Opus 4.5 measured
Neither model has a result on the other 1 board here

GeneralLike-for-likePublic boards, shown as published, kept out of the index210

General benchmarks for Claude Opus 4.5 and Qwen3.5-Flash
Benchmark	Claude Opus 4.5	Qwen3.5-Flash	Leader
SAGE (Vals AI)	52.1%	42.5%	Claude Opus 4.5
MedScribe (Vals AI)	85.3%	70.6%	Claude Opus 4.5
IFBench	58.0%	Not measured	Only Claude Opus 4.5 measured
Long context reasoning (AA-LCR)	77.3%	Not measured	Only Claude Opus 4.5 measured
DTBench	89.9%	82.9%	Claude Opus 4.5
LMCA	44.5%	29.1%	Claude Opus 4.5
CL-bench	21.1%	Not measured	Only Claude Opus 4.5 measured
Furniture assembly	28.3%	Not measured	Only Claude Opus 4.5 measured
LMArena Text	1451	1397	Claude Opus 4.5
LMArena Text: instruction following	1478	1374	Claude Opus 4.5
LMArena Text: creative writing	1445	1343	Claude Opus 4.5
LMArena Text: English	1461	1404	Claude Opus 4.5
LMArena Text: non-English	1438	1385	Claude Opus 4.5
LMArena Text: Chinese	1470	1445	Claude Opus 4.5
LMArena Text: German	1449	1390	Claude Opus 4.5
LMArena Text: Japanese	1417	1369	Claude Opus 4.5
LMArena Text: Korean	1424	1344	Claude Opus 4.5
LMArena Text: French	1471	1413	Claude Opus 4.5
LMArena Text: Spanish	1457	1400	Claude Opus 4.5
LMArena Text: Russian	1447	1380	Claude Opus 4.5
LMArena Text: Polish	1439	1376	Claude Opus 4.5
LMArena Text: multi-turn	1466	1393	Claude Opus 4.5
LMArena Text: longer queries	1479	1392	Claude Opus 4.5
LMArena Text: writing and language	1452	1369	Claude Opus 4.5
LMArena Text: entertainment and media	1434	1347	Claude Opus 4.5
LMArena Document	1462	Not measured	Only Claude Opus 4.5 measured
MultiChallenge	59.0%	Not measured	Only Claude Opus 4.5 measured
Neither model has a result on the other 21 boards here

Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared

Image generation benchmarks for Claude Opus 4.5 and Qwen3.5-Flash
Benchmark	Claude Opus 4.5	Qwen3.5-Flash	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 Opus 4.5$0.018Fits in one request

Qwen3.5-Flash$0.0002Fits in one request

Qwen3.5-Flash costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.5$0.325Fits in one request

Qwen3.5-Flash$0.0040Fits in one request

Qwen3.5-Flash costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.5$1.25Exceeds 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 Opus 4.5 and Qwen3.5-Flash
Specification	Anthropic Claude Opus 4.5	Qwen3.5-Flash
Maker	Anthropic	Qwen
Weights	No public weights listed	No public weights listed
Released	November 24, 2025	February 25, 2026
Context window	200K	1M
Input $/Mtok	$5.00	$0.065
Output $/Mtok	$25.00	$0.26
Coding index	44.0	41.1
Independent measurements behind it	3	2
Cost per solved task	$1.37	$0.40
Source	OpenRouter listing	OpenRouter listing

Questions

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

Pick Claude Opus 4.5 for coding: it scores 44.0 on the Vibe Coding Index against 41.1 for Qwen3.5-Flash. Pick Qwen3.5-Flash for output tokens 96.2x cheaper ($0.26 vs $25.00 per million) and a lower cost per solved task ($0.40 against $1.37).

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

Claude Opus 4.5 costs $5.00 per million input tokens and $25.00 per million output tokens; Qwen3.5-Flash costs $0.065 and $0.26. Per solved SWE-bench Verified task, Claude Opus 4.5 costs $1.37 and Qwen3.5-Flash $0.40.

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

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

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

54 benchmarks have a result for both models as of October 22, 2026. Claude Opus 4.5's coding index rests on 3 independent benchmarks and Qwen3.5-Flash's on 2. Where only one model has a result, the page says so instead of naming a winner.

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Claude Opus 4.5 or Qwen3.5-Flash: which to pick

Which one for your work

Coding

Intelligence

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