GPT-5.4 vs Qwen3.5 Plus 2026-04-20

GPT-5.4 leads Qwen3.5 Plus 2026-04-20 on coding, 64.4 to 39.5 on the Vibe Coding Index, and Qwen3.5 Plus 2026-04-20 costs 8.3x less per output token ($1.80 vs $15.00 per million). Updated October 22, 2026; 25 benchmarks have a result for both.

Replace GPT-5.4 Replace Qwen3.5 Plus 2026-04-20

GPT-5.4OpenAI

Coding: 64.4
Overall: 69.6
Output $/M: $15.00

Qwen3.5 Plus 2026-04-20Qwen

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

vs boards won of 25 shared

GPT-5.4 or Qwen3.5 Plus 2026-04-20: which to pick

Pick GPT-5.4 for coding: it scores 64.4 on the Vibe Coding Index against 39.5 for Qwen3.5 Plus 2026-04-20.

Pick Qwen3.5 Plus 2026-04-20 for output tokens 8.3x cheaper ($1.80 vs $15.00 per million) and work measured by LiveCodeBench (Vals AI) or CorpFin (Vals AI), where it leads.

Model AGPT-5.4OpenAI64.4/1003 independent benchmarks$1.02 per solved task Model BQwen3.5 Plus 2026-04-20Qwen39.5/1002 independent benchmarks$1.35 per solved task

2585

Shared results: 25
GPT-5.4 only: 85
Qwen3.5 Plus 2026-04-20 only: 0
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
GPT-5.4
GPT-5.4 scores 64.4 against 39.5.
3 and 2 benchmarks behind the scores
Intelligence
AA Intelligence Index
No call
Only GPT-5.4 has a AA Intelligence Index result, 39.0.
Directional only
Reasoning
GPQA Diamond
GPT-5.4
GPT-5.4 leads, 91.7% against 87.4%.
Same board, both measured
Math
AIME
GPT-5.4
GPT-5.4 leads, 96.7% against 86.0%.
Same board, both measured
Knowledge
MMLU Pro
GPT-5.4
GPT-5.4 leads, 87.5% against 87.2%.
Same board, both measured
Web design
Design Arena: websites
No call
Only GPT-5.4 has a Design Arena: websites result, 1198.
Directional only
Long documents
Listed context window
GPT-5.4
GPT-5.4 takes 1.05M tokens against 1M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Qwen3.5 Plus 2026-04-20
GPT-5.4 $0.010, Qwen3.5 Plus 2026-04-20 $0.0012 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
GPT-5.4
GPT-5.4 $1.02, Qwen3.5 Plus 2026-04-20 $1.35.
Published attempt cost and pass rate

At a glance

Coding index: GPT-5.4 64.4 from 3 benchmarks, Qwen3.5 Plus 2026-04-20 39.5 from 2 benchmarks.
Widest category: Agentic work, 38.4 points apart on average over 1 shared benchmark.
Widest single gap: MMMU Pro (Vals AI): GPT-5.4 87.5% against Qwen3.5 Plus 2026-04-20 22.8%, 64.7 points apart on a 0 to 100 scale.
Output price: GPT-5.4 $15.00 against Qwen3.5 Plus 2026-04-20 $1.80 per million output tokens, 8.3x apart.
Context window: GPT-5.4 takes 1.05M 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	GPT-5.4	Qwen3.5 Plus 2026-04-20
Coding	3	1
Intelligence	1	0
Agentic work	1	0
Reasoning	5	0
Math	2	0
Knowledge	6	1
General	5	0
All shared boards	23	2

CodingLike-for-likeSix of these boards feed the Vibe Coding Index31

Coding benchmarks for GPT-5.4 and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-5.4	Qwen3.5 Plus 2026-04-20	Leader
LMArena WebDev	1464	Not measured	Only GPT-5.4 measured
AA Coding Index	71.1	Not measured	Only GPT-5.4 measured
LiveCodeBench (Vals AI)	84.1%	85.3%	Qwen3.5 Plus 2026-04-20
SWE-bench Verified (Vals AI)	78.2%	71.2%	GPT-5.4
Vibe Code Bench (Vals AI)	67.4%	15.7%	GPT-5.4
Code migration (Vals AI)	35.0%	Not measured	Only GPT-5.4 measured
ProgramBench (Vals AI)	0.5%	Not measured	Only GPT-5.4 measured
SkillsBench (Vals AI)	51.7%	Not measured	Only GPT-5.4 measured
Terminal-Bench Hard (Artificial Analysis run)	57.6%	Not measured	Only GPT-5.4 measured
Terminal-Bench	81.8%	Not measured	Only GPT-5.4 measured
GSO-Bench	31.4%	Not measured	Only GPT-5.4 measured
WeirdML	77.7%	Not measured	Only GPT-5.4 measured
MirrorCode	15.6%	Not measured	Only GPT-5.4 measured
ALE-Bench	1607.0	608.9	GPT-5.4
LMArena Text: coding	1496	Not measured	Only GPT-5.4 measured
LMArena Text: software and IT	1491	Not measured	Only GPT-5.4 measured
LMArena WebDev: React	1454	Not measured	Only GPT-5.4 measured
LMArena WebDev: HTML	1478	Not measured	Only GPT-5.4 measured
LMArena WebDev: from an image	1436	Not measured	Only GPT-5.4 measured
Neither model has a result on the other 20 boards here

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

Intelligence benchmarks for GPT-5.4 and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-5.4	Qwen3.5 Plus 2026-04-20	Leader
AA Intelligence Index	39.0	Not measured	Only GPT-5.4 measured
Epoch Capabilities Index	157.3	146.2	GPT-5.4

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

Agentic work benchmarks for GPT-5.4 and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-5.4	Qwen3.5 Plus 2026-04-20	Leader
Design Arena: agents building web apps	1059	Not measured	Only GPT-5.4 measured
Design Arena: agents building full-stack apps	1017	Not measured	Only GPT-5.4 measured
Design Arena: agents building mobile apps	1087	Not measured	Only GPT-5.4 measured
Design Arena: agents building Android apps	1031	Not measured	Only GPT-5.4 measured
Design Arena: agents building Godot games	1135	Not measured	Only GPT-5.4 measured
τ²-Bench Telecom	87.1%	Not measured	Only GPT-5.4 measured
APEX-Agents	52.4%	Not measured	Only GPT-5.4 measured
METR time horizons	74.3%	Not measured	Only GPT-5.4 measured
DeepResearch Bench	35.1%	Not measured	Only GPT-5.4 measured
PostTrainBench	19.0%	Not measured	Only GPT-5.4 measured
Vending-Bench 2	$6,144	$1	GPT-5.4
Neither model has a result on the other 30 boards here

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

Reasoning benchmarks for GPT-5.4 and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-5.4	Qwen3.5 Plus 2026-04-20	Leader
GPQA Diamond	91.7%	87.4%	GPT-5.4
MMMU Pro (Vals AI)	87.5%	22.8%	GPT-5.4
GPQA Diamond (Artificial Analysis run)	92.0%	Not measured	Only GPT-5.4 measured
Humanity's Last Exam (Artificial Analysis run)	43.7%	Not measured	Only GPT-5.4 measured
GPQA Diamond (Epoch AI run)	93.3%	84.8%	GPT-5.4
ARC-AGI	93.7%	Not measured	Only GPT-5.4 measured
ARC-AGI-2	74.0%	Not measured	Only GPT-5.4 measured
Chess puzzles	48.0%	8.0%	GPT-5.4
Mystery game puzzles	37.0%	17.0%	GPT-5.4
EBR-bench	25.4%	Not measured	Only GPT-5.4 measured
LMArena Text: hard prompts	1485	Not measured	Only GPT-5.4 measured
LMArena Text: expert	1507	Not measured	Only GPT-5.4 measured
LMArena Text: hard prompts in English	1479	Not measured	Only GPT-5.4 measured
LMArena Vision: diagrams	1327	Not measured	Only GPT-5.4 measured
LMArena Vision: homework	1336	Not measured	Only GPT-5.4 measured
Kagi LLM Benchmark	63.8%	Not measured	Only GPT-5.4 measured
Neither model has a result on the other 6 boards here

MathLike-for-likePublic boards, shown as published, kept out of the index20

Math benchmarks for GPT-5.4 and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-5.4	Qwen3.5 Plus 2026-04-20	Leader
AIME	96.7%	86.0%	GPT-5.4
OTIS Mock AIME	97.8%	86.7%	GPT-5.4
FrontierMath, tiers 1 to 3	78.6%	Not measured	Only GPT-5.4 measured
FrontierMath, tier 4	49.0%	Not measured	Only GPT-5.4 measured
ProofBench	56.0%	Not measured	Only GPT-5.4 measured
LMArena Text: math	1488	Not measured	Only GPT-5.4 measured
LMArena Text: mathematical work	1497	Not measured	Only GPT-5.4 measured
Neither model has a result on the other 6 boards here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index61

Knowledge benchmarks for GPT-5.4 and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-5.4	Qwen3.5 Plus 2026-04-20	Leader
MMLU Pro	87.5%	87.2%	GPT-5.4
LegalBench (Vals AI)	86.0%	85.1%	GPT-5.4
CaseLaw (Vals AI)	63.8%	59.7%	GPT-5.4
CorpFin (Vals AI)	65.3%	65.3%	Qwen3.5 Plus 2026-04-20
TaxEval (Vals AI)	74.0%	Not measured	Only GPT-5.4 measured
MortgageTax (Vals AI)	68.3%	60.8%	GPT-5.4
MedQA (Vals AI)	96.1%	95.2%	GPT-5.4
MedCode (Vals AI)	41.3%	Not measured	Only GPT-5.4 measured
SimpleQA Verified	45.1%	25.4%	GPT-5.4
LMArena Text: science	1479	Not measured	Only GPT-5.4 measured
LMArena Text: medicine and healthcare	1458	Not measured	Only GPT-5.4 measured
LMArena Text: legal and government	1486	Not measured	Only GPT-5.4 measured
LMArena Text: business and finance	1474	Not measured	Only GPT-5.4 measured
Neither model has a result on the other 5 boards here

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

Web design benchmarks for GPT-5.4 and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-5.4	Qwen3.5 Plus 2026-04-20	Leader
Design Arena: websites	1198	Not measured	Only GPT-5.4 measured
Design Arena: UI components	1212	Not measured	Only GPT-5.4 measured
Design Arena: game dev	1194	Not measured	Only GPT-5.4 measured
Design Arena: data viz	1196	Not measured	Only GPT-5.4 measured
Design Arena: 3D	1065	Not measured	Only GPT-5.4 measured
Design Arena: all code categories	1179	Not measured	Only GPT-5.4 measured
Design Arena: SVG	1141	Not measured	Only GPT-5.4 measured
Design Arena: ASCII art	1188	Not measured	Only GPT-5.4 measured
Neither model has a result on the other 1 board here

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

General benchmarks for GPT-5.4 and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-5.4	Qwen3.5 Plus 2026-04-20	Leader
SAGE (Vals AI)	43.3%	30.4%	GPT-5.4
MedScribe (Vals AI)	77.5%	Not measured	Only GPT-5.4 measured
IFBench	73.9%	Not measured	Only GPT-5.4 measured
Long context reasoning (AA-LCR)	82.0%	Not measured	Only GPT-5.4 measured
DTBench	94.4%	80.5%	GPT-5.4
LMCA	52.0%	36.4%	GPT-5.4
CL-bench	27.9%	19.8%	GPT-5.4
Furniture assembly	37.5%	Not measured	Only GPT-5.4 measured
CL-bench Life	21.7%	12.4%	GPT-5.4
LMArena Text	1469	Not measured	Only GPT-5.4 measured
LMArena Text: instruction following	1469	Not measured	Only GPT-5.4 measured
LMArena Text: creative writing	1439	Not measured	Only GPT-5.4 measured
LMArena Vision	1303	Not measured	Only GPT-5.4 measured
LMArena Text: English	1467	Not measured	Only GPT-5.4 measured
LMArena Text: non-English	1465	Not measured	Only GPT-5.4 measured
LMArena Text: Chinese	1520	Not measured	Only GPT-5.4 measured
LMArena Text: German	1472	Not measured	Only GPT-5.4 measured
LMArena Text: Japanese	1485	Not measured	Only GPT-5.4 measured
LMArena Text: Korean	1449	Not measured	Only GPT-5.4 measured
LMArena Text: French	1493	Not measured	Only GPT-5.4 measured
LMArena Text: Spanish	1452	Not measured	Only GPT-5.4 measured
LMArena Text: Russian	1480	Not measured	Only GPT-5.4 measured
LMArena Text: Polish	1472	Not measured	Only GPT-5.4 measured
LMArena Text: multi-turn	1482	Not measured	Only GPT-5.4 measured
LMArena Text: longer queries	1473	Not measured	Only GPT-5.4 measured
LMArena Text: writing and language	1458	Not measured	Only GPT-5.4 measured
LMArena Text: entertainment and media	1438	Not measured	Only GPT-5.4 measured
LMArena Vision: English	1301	Not measured	Only GPT-5.4 measured
LMArena Vision: Chinese	1354	Not measured	Only GPT-5.4 measured
LMArena Vision: reading text	1312	Not measured	Only GPT-5.4 measured
LMArena Vision: humor	1284	Not measured	Only GPT-5.4 measured
LMArena Vision: recognizing things	1251	Not measured	Only GPT-5.4 measured
LMArena Vision: creative writing	1283	Not measured	Only GPT-5.4 measured
LMArena Document	1471	Not measured	Only GPT-5.4 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 GPT-5.4 and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-5.4	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

GPT-5.4$0.010Fits 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

GPT-5.4$0.170Fits 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

GPT-5.4$0.650Fits in one request

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 GPT-5.4 and Qwen3.5 Plus 2026-04-20
Specification	OpenAI GPT-5.4	Qwen3.5 Plus 2026-04-20
Maker	OpenAI	Qwen
Weights	No public weights listed	No public weights listed
Released	March 5, 2026	April 27, 2026
Context window	1.05M	1M
Input $/Mtok	$2.50	$0.30
Output $/Mtok	$15.00	$1.80
Coding index	64.4	39.5
Independent measurements behind it	3	2
Cost per solved task	$1.02	$1.35
Source	OpenRouter listing	OpenRouter listing

Questions

Is GPT-5.4 better than Qwen3.5 Plus 2026-04-20 for coding?

Pick GPT-5.4 for coding: it scores 64.4 on the Vibe Coding Index against 39.5 for Qwen3.5 Plus 2026-04-20. Pick Qwen3.5 Plus 2026-04-20 for output tokens 8.3x cheaper ($1.80 vs $15.00 per million) and work measured by LiveCodeBench (Vals AI) or CorpFin (Vals AI), where it leads.

Which is cheaper, GPT-5.4 or Qwen3.5 Plus 2026-04-20?

GPT-5.4 costs $2.50 per million input tokens and $15.00 per million output tokens; Qwen3.5 Plus 2026-04-20 costs $0.30 and $1.80. Per solved SWE-bench Verified task, GPT-5.4 costs $1.02 and Qwen3.5 Plus 2026-04-20 $1.35.

Which has the bigger context window, GPT-5.4 or Qwen3.5 Plus 2026-04-20?

GPT-5.4, with 1.05M tokens against 1M.

How many benchmarks is the GPT-5.4 vs Qwen3.5 Plus 2026-04-20 comparison based on?

25 benchmarks have a result for both models as of October 22, 2026. GPT-5.4's coding index rests on 3 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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GPT-5.4 or Qwen3.5 Plus 2026-04-20: 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

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