GPT-4o (2024-11-20) vs Qwen3.5 Plus 2026-04-20

Qwen3.5 Plus 2026-04-20 costs 5.6x less per output token than GPT-4o (2024-11-20) ($1.80 vs $10.00 per million). Updated October 23, 2026; 11 benchmarks have a result for both.

Replace GPT-4o (2024-11-20) Replace Qwen3.5 Plus 2026-04-20

GPT-4o (2024-11-20)OpenAI

Coding: No data
Overall: No data
Output $/M: $10.00

Qwen3.5 Plus 2026-04-20Qwen

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

vs boards won of 11 shared, 1 tied

GPT-4o (2024-11-20) or Qwen3.5 Plus 2026-04-20: which to pick

Only Qwen3.5 Plus 2026-04-20 has a coding score, 39.5 on the Vibe Coding Index; GPT-4o (2024-11-20) has none, so the two cannot be ranked on coding.

Pick GPT-4o (2024-11-20) for work measured by MMMU Pro (Vals AI), where it leads.

Model AGPT-4o (2024-11-20)OpenAINot benchmarkedNo coding benchmarkNo cost per solved task Model BQwen3.5 Plus 2026-04-20Qwen39.5/1002 independent benchmarks$1.35 per solved task

111314

Shared results: 11
GPT-4o (2024-11-20) only: 13
Qwen3.5 Plus 2026-04-20 only: 14
Like-for-like categories: 4 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
No call
Only Qwen3.5 Plus 2026-04-20 has a coding score, so no call is made.
One side not measured
Intelligence
AA Intelligence Index
No call
Only GPT-4o (2024-11-20) has a AA Intelligence Index result, 8.4.
Directional only
Reasoning
GPQA Diamond
Qwen3.5 Plus 2026-04-20
Qwen3.5 Plus 2026-04-20 leads, 87.4% against 53.8%.
Same board, both measured
Math
AIME
Qwen3.5 Plus 2026-04-20
Qwen3.5 Plus 2026-04-20 leads, 86.0% against 11.9%.
Same board, both measured
Knowledge
MMLU Pro
Qwen3.5 Plus 2026-04-20
Qwen3.5 Plus 2026-04-20 leads, 87.2% against 72.6%.
Same board, both measured
Long documents
Listed context window
Qwen3.5 Plus 2026-04-20
Qwen3.5 Plus 2026-04-20 takes 1M tokens against 128K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Qwen3.5 Plus 2026-04-20
GPT-4o (2024-11-20) $0.0075, Qwen3.5 Plus 2026-04-20 $0.0012 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Qwen3.5 Plus 2026-04-20 has the number, $1.35.
Directional only

At a glance

Coding index: GPT-4o (2024-11-20) not benchmarked, Qwen3.5 Plus 2026-04-20 39.5 from 2 benchmarks.
Widest category: Math, 77.3 points apart on average over 2 shared benchmarks.
Widest single gap: OTIS Mock AIME: GPT-4o (2024-11-20) 6.3% against Qwen3.5 Plus 2026-04-20 86.7%, 80.4 points apart on a 0 to 100 scale.
Output price: GPT-4o (2024-11-20) $10.00 against Qwen3.5 Plus 2026-04-20 $1.80 per million output tokens, 5.6x apart.
Context window: GPT-4o (2024-11-20) takes 128K 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-4o (2024-11-20)	Qwen3.5 Plus 2026-04-20	Ties
Coding	0	1
Reasoning	1	2
Math	0	2
Knowledge	0	4	1 tie
All shared boards	1	9	1 tie

CodingLike-for-likeSix of these boards feed the Vibe Coding Index01

Coding benchmarks for GPT-4o (2024-11-20) and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-4o (2024-11-20)	Qwen3.5 Plus 2026-04-20	Leader
Aider polyglot	18.2%	Not measured	Only GPT-4o (2024-11-20) measured
LiveCodeBench (Vals AI)	43.4%	85.3%	Qwen3.5 Plus 2026-04-20
SWE-bench Verified (Vals AI)	Not measured	71.2%	Only Qwen3.5 Plus 2026-04-20 measured
Vibe Code Bench (Vals AI)	Not measured	15.7%	Only Qwen3.5 Plus 2026-04-20 measured
GSO-Bench	0.0%	Not measured	Only GPT-4o (2024-11-20) measured
WeirdML	25.1%	Not measured	Only GPT-4o (2024-11-20) measured
Cybench	12.5%	Not measured	Only GPT-4o (2024-11-20) measured
ALE-Bench	Not measured	608.9	Only Qwen3.5 Plus 2026-04-20 measured
Neither model has a result on the other 35 boards here

IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared

Intelligence benchmarks for GPT-4o (2024-11-20) and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-4o (2024-11-20)	Qwen3.5 Plus 2026-04-20	Leader
AA Intelligence Index	8.4	Not measured	Only GPT-4o (2024-11-20) measured
Epoch Capabilities Index	Not measured	146.2	Only Qwen3.5 Plus 2026-04-20 measured

Agentic workDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared

Agentic work benchmarks for GPT-4o (2024-11-20) and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-4o (2024-11-20)	Qwen3.5 Plus 2026-04-20	Leader
TheAgentCompany	8.6%	Not measured	Only GPT-4o (2024-11-20) measured
Vending-Bench 2	Not measured	$1	Only Qwen3.5 Plus 2026-04-20 measured
Neither model has a result on the other 40 boards here

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

Reasoning benchmarks for GPT-4o (2024-11-20) and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-4o (2024-11-20)	Qwen3.5 Plus 2026-04-20	Leader
GPQA Diamond	53.8%	87.4%	Qwen3.5 Plus 2026-04-20
MMMU Pro (Vals AI)	62.2%	22.8%	GPT-4o (2024-11-20)
GPQA Diamond (Epoch AI run)	47.9%	84.8%	Qwen3.5 Plus 2026-04-20
Chess puzzles	Not measured	8.0%	Only Qwen3.5 Plus 2026-04-20 measured
Mystery game puzzles	Not measured	17.0%	Only Qwen3.5 Plus 2026-04-20 measured
VPCT	40.0%	Not measured	Only GPT-4o (2024-11-20) measured
Neither model has a result on the other 17 boards here

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

Math benchmarks for GPT-4o (2024-11-20) and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-4o (2024-11-20)	Qwen3.5 Plus 2026-04-20	Leader
AIME	11.9%	86.0%	Qwen3.5 Plus 2026-04-20
MATH 500 (Vals AI)	74.0%	Not measured	Only GPT-4o (2024-11-20) measured
MGSM (Vals AI)	90.4%	Not measured	Only GPT-4o (2024-11-20) measured
OTIS Mock AIME	6.3%	86.7%	Qwen3.5 Plus 2026-04-20
MATH level 5	49.8%	Not measured	Only GPT-4o (2024-11-20) measured
Neither model has a result on the other 9 boards here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index04

Knowledge benchmarks for GPT-4o (2024-11-20) and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-4o (2024-11-20)	Qwen3.5 Plus 2026-04-20	Leader
MMLU Pro	72.6%	87.2%	Qwen3.5 Plus 2026-04-20
LegalBench (Vals AI)	82.2%	85.1%	Qwen3.5 Plus 2026-04-20
CaseLaw (Vals AI)	59.7%	59.7%	Tie
CorpFin (Vals AI)	45.9%	65.3%	Qwen3.5 Plus 2026-04-20
TaxEval (Vals AI)	74.5%	Not measured	Only GPT-4o (2024-11-20) measured
MortgageTax (Vals AI)	57.4%	60.8%	Qwen3.5 Plus 2026-04-20
MedQA (Vals AI)	Not measured	95.2%	Only Qwen3.5 Plus 2026-04-20 measured
SimpleQA Verified	Not measured	25.4%	Only Qwen3.5 Plus 2026-04-20 measured
GeoBench	71.0%	Not measured	Only GPT-4o (2024-11-20) measured
Neither model has a result on the other 11 boards here

Web designNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared

Web design benchmarks for GPT-4o (2024-11-20) and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-4o (2024-11-20)	Qwen3.5 Plus 2026-04-20	Leader
Neither model has a result on 9 boards here

GeneralDirectional onlyPublic boards, shown as published, kept out of the index6 boards, none shared

General benchmarks for GPT-4o (2024-11-20) and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-4o (2024-11-20)	Qwen3.5 Plus 2026-04-20	Leader
SAGE (Vals AI)	Not measured	30.4%	Only Qwen3.5 Plus 2026-04-20 measured
DTBench	Not measured	80.5%	Only Qwen3.5 Plus 2026-04-20 measured
LMCA	Not measured	36.4%	Only Qwen3.5 Plus 2026-04-20 measured
Creative writing (Lech Mazur)	81.8%	Not measured	Only GPT-4o (2024-11-20) measured
CL-bench	Not measured	19.8%	Only Qwen3.5 Plus 2026-04-20 measured
CL-bench Life	Not measured	12.4%	Only Qwen3.5 Plus 2026-04-20 measured
Neither model has a result on the other 42 boards here

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

Image generation benchmarks for GPT-4o (2024-11-20) and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-4o (2024-11-20)	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-4o (2024-11-20)$0.0075Fits 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-4o (2024-11-20)$0.155Fits 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-4o (2024-11-20)$0.600Exceeds 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 GPT-4o (2024-11-20) and Qwen3.5 Plus 2026-04-20
Specification	OpenAI GPT-4o (2024-11-20)	Qwen3.5 Plus 2026-04-20
Maker	OpenAI	Qwen
Weights	No public weights listed	No public weights listed
Released	November 20, 2024	April 27, 2026
Context window	128K	1M
Input $/Mtok	$2.50	$0.30
Output $/Mtok	$10.00	$1.80
Coding index	Not benchmarked	39.5
Independent measurements behind it	0	2
Cost per solved task	Not computable	$1.35
Source	OpenRouter listing	OpenRouter listing

Questions

Is GPT-4o (2024-11-20) better than Qwen3.5 Plus 2026-04-20 for coding?

Only Qwen3.5 Plus 2026-04-20 has a coding score, 39.5 on the Vibe Coding Index; GPT-4o (2024-11-20) has none, so the two cannot be ranked on coding. Pick GPT-4o (2024-11-20) for work measured by MMMU Pro (Vals AI), where it leads.

Which is cheaper, GPT-4o (2024-11-20) or Qwen3.5 Plus 2026-04-20?

GPT-4o (2024-11-20) costs $2.50 per million input tokens and $10.00 per million output tokens; Qwen3.5 Plus 2026-04-20 costs $0.30 and $1.80. Cost per solved task is known for Qwen3.5 Plus 2026-04-20 only.

Which has the bigger context window, GPT-4o (2024-11-20) or Qwen3.5 Plus 2026-04-20?

Qwen3.5 Plus 2026-04-20, with 1M tokens against 128K.

How many benchmarks is the GPT-4o (2024-11-20) vs Qwen3.5 Plus 2026-04-20 comparison based on?

11 benchmarks have a result for both models as of October 23, 2026. GPT-4o (2024-11-20)'s coding index rests on 0 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.

GPT-4o (2024-11-20) or Qwen3.5 Plus 2026-04-20: which to pick

Which one for your work

Coding

Intelligence

Reasoning

Math

Knowledge

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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