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

Qwen3.5 Plus 2026-04-20 leads GPT-5 Mini on coding, 39.5 to 34.2 on the Vibe Coding Index, at about the same output price ($1.80 vs $2.00 per million). Updated October 22, 2026; 22 benchmarks have a result for both.

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

GPT-5 MiniOpenAI

Coding: 34.2
Overall: 43.7
Output $/M: $2.00

Qwen3.5 Plus 2026-04-20Qwen

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

vs boards won of 22 shared, 2 tied

GPT-5 Mini 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 34.2 for GPT-5 Mini.

Pick GPT-5 Mini for a lower cost per solved task ($0.08 against $1.35) and work measured by LiveCodeBench (Vals AI) or MMMU Pro (Vals AI), where it leads.

Model AGPT-5 MiniOpenAI34.2/1002 independent benchmarks$0.08 per solved task Model BQwen3.5 Plus 2026-04-20Qwen39.5/1002 independent benchmarks$1.35 per solved task

22813

Shared results: 22
GPT-5 Mini only: 81
Qwen3.5 Plus 2026-04-20 only: 3
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 34.2.
2 benchmarks behind each score
Intelligence
AA Intelligence Index
No call
Only GPT-5 Mini has a AA Intelligence Index result, 20.6.
Directional only
Reasoning
GPQA Diamond
Qwen3.5 Plus 2026-04-20
Qwen3.5 Plus 2026-04-20 leads, 87.4% against 80.3%.
Same board, both measured
Math
AIME
GPT-5 Mini
GPT-5 Mini leads, 91.5% against 86.0%.
Same board, both measured
Knowledge
MMLU Pro
Qwen3.5 Plus 2026-04-20
Qwen3.5 Plus 2026-04-20 leads, 87.2% against 82.2%.
Same board, both measured
Web design
Design Arena: websites
No call
Only GPT-5 Mini has a Design Arena: websites result, 1125.
Directional only
Long documents
Listed context window
Qwen3.5 Plus 2026-04-20
Qwen3.5 Plus 2026-04-20 takes 1M tokens against 400K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Qwen3.5 Plus 2026-04-20
GPT-5 Mini $0.0013, Qwen3.5 Plus 2026-04-20 $0.0012 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
GPT-5 Mini
GPT-5 Mini $0.08, Qwen3.5 Plus 2026-04-20 $1.35.
Published attempt cost and pass rate

At a glance

Coding index: GPT-5 Mini 34.2 from 2 benchmarks, Qwen3.5 Plus 2026-04-20 39.5 from 2 benchmarks.
Widest category: Reasoning, 19.2 points apart on average over 5 shared benchmarks.
Widest single gap: MMMU Pro (Vals AI): GPT-5 Mini 78.9% against Qwen3.5 Plus 2026-04-20 22.8%, 56.1 points apart on a 0 to 100 scale.
Output price: GPT-5 Mini $2.00 against Qwen3.5 Plus 2026-04-20 $1.80 per million output tokens, 1.1x apart.
Context window: GPT-5 Mini takes 400K 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 Mini	Qwen3.5 Plus 2026-04-20	Ties
Coding	1	2
Intelligence	0	1
Agentic work	0	1
Reasoning	2	3
Math	1	0	1 tie
Knowledge	3	4
General	1	1	1 tie
All shared boards	8	12	2 ties

CodingLike-for-likeSix of these boards feed the Vibe Coding Index12

Coding benchmarks for GPT-5 Mini and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-5 Mini	Qwen3.5 Plus 2026-04-20	Leader
SWE-bench Verified	59.8%	Not measured	Only GPT-5 Mini measured
SWE-bench Multilingual	39.7%	Not measured	Only GPT-5 Mini measured
LiveCodeBench (Vals AI)	86.6%	85.3%	GPT-5 Mini
SWE-bench Verified (Vals AI)	60.8%	71.2%	Qwen3.5 Plus 2026-04-20
Vibe Code Bench (Vals AI)	14.2%	15.7%	Qwen3.5 Plus 2026-04-20
LiveCodeBench (Artificial Analysis run)	83.8%	Not measured	Only GPT-5 Mini measured
SciCode	39.0%	Not measured	Only GPT-5 Mini measured
Terminal-Bench Hard (Artificial Analysis run)	33.3%	Not measured	Only GPT-5 Mini measured
Terminal-Bench	34.8%	Not measured	Only GPT-5 Mini measured
WeirdML	52.7%	Not measured	Only GPT-5 Mini measured
ALE-Bench	Not measured	608.9	Only Qwen3.5 Plus 2026-04-20 measured
LMArena Text: coding	1406	Not measured	Only GPT-5 Mini measured
LMArena Text: software and IT	1394	Not measured	Only GPT-5 Mini measured
Neither model has a result on the other 30 boards here

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

Intelligence benchmarks for GPT-5 Mini and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-5 Mini	Qwen3.5 Plus 2026-04-20	Leader
AA Intelligence Index	20.6	Not measured	Only GPT-5 Mini measured
Epoch Capabilities Index	145.3	146.2	Qwen3.5 Plus 2026-04-20

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

Agentic work benchmarks for GPT-5 Mini and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-5 Mini	Qwen3.5 Plus 2026-04-20	Leader
τ²-Bench Telecom	71.1%	Not measured	Only GPT-5 Mini measured
Vending-Bench 2	-$31	$1	Qwen3.5 Plus 2026-04-20
Berkeley Function Calling Leaderboard (BFCL)	55.5%	Not measured	Only GPT-5 Mini measured
Neither model has a result on the other 39 boards here

ReasoningLike-for-likePublic boards, shown as published, kept out of the index23

Reasoning benchmarks for GPT-5 Mini and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-5 Mini	Qwen3.5 Plus 2026-04-20	Leader
GPQA Diamond	80.3%	87.4%	Qwen3.5 Plus 2026-04-20
MMMU Pro (Vals AI)	78.9%	22.8%	GPT-5 Mini
GPQA Diamond (Artificial Analysis run)	82.8%	Not measured	Only GPT-5 Mini measured
Humanity's Last Exam (Artificial Analysis run)	21.5%	Not measured	Only GPT-5 Mini measured
GPQA Diamond (Epoch AI run)	75.0%	84.8%	Qwen3.5 Plus 2026-04-20
ARC-AGI	54.3%	Not measured	Only GPT-5 Mini measured
ARC-AGI-2	4.4%	Not measured	Only GPT-5 Mini measured
Chess puzzles	24.0%	8.0%	GPT-5 Mini
Mystery game puzzles	10.0%	17.0%	Qwen3.5 Plus 2026-04-20
VPCT	40.2%	Not measured	Only GPT-5 Mini measured
LMArena Text: hard prompts	1380	Not measured	Only GPT-5 Mini measured
LMArena Text: expert	1379	Not measured	Only GPT-5 Mini measured
LMArena Text: hard prompts in English	1383	Not measured	Only GPT-5 Mini measured
LMArena Vision: diagrams	1202	Not measured	Only GPT-5 Mini measured
LMArena Vision: homework	1210	Not measured	Only GPT-5 Mini measured
Kagi LLM Benchmark	70.3%	Not measured	Only GPT-5 Mini measured
Neither model has a result on the other 7 boards here

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

Math benchmarks for GPT-5 Mini and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-5 Mini	Qwen3.5 Plus 2026-04-20	Leader
AIME	91.5%	86.0%	GPT-5 Mini
MATH 500 (Vals AI)	94.8%	Not measured	Only GPT-5 Mini measured
MGSM (Vals AI)	92.6%	Not measured	Only GPT-5 Mini measured
AA Math Index	90.7	Not measured	Only GPT-5 Mini measured
AIME 2025 (Artificial Analysis run)	90.7%	Not measured	Only GPT-5 Mini measured
OTIS Mock AIME	86.7%	86.7%	Tie
FrontierMath, tiers 1 to 3	46.7%	Not measured	Only GPT-5 Mini measured
FrontierMath, tier 4	12.2%	Not measured	Only GPT-5 Mini measured
ProofBench	9.0%	Not measured	Only GPT-5 Mini measured
MATH level 5	97.8%	Not measured	Only GPT-5 Mini measured
LMArena Text: math	1378	Not measured	Only GPT-5 Mini measured
LMArena Text: mathematical work	1380	Not measured	Only GPT-5 Mini measured
MathArena	14.8%	Not measured	Only GPT-5 Mini measured
Neither model has a result on the other 1 board here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index34

Knowledge benchmarks for GPT-5 Mini and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-5 Mini	Qwen3.5 Plus 2026-04-20	Leader
MMLU Pro	82.2%	87.2%	Qwen3.5 Plus 2026-04-20
LegalBench (Vals AI)	81.8%	85.1%	Qwen3.5 Plus 2026-04-20
CaseLaw (Vals AI)	68.5%	59.7%	GPT-5 Mini
CorpFin (Vals AI)	60.2%	65.3%	Qwen3.5 Plus 2026-04-20
TaxEval (Vals AI)	75.2%	Not measured	Only GPT-5 Mini measured
MortgageTax (Vals AI)	66.9%	60.8%	GPT-5 Mini
MedQA (Vals AI)	96.1%	95.2%	GPT-5 Mini
MedCode (Vals AI)	43.0%	Not measured	Only GPT-5 Mini measured
MMLU Pro (Artificial Analysis run)	83.7%	Not measured	Only GPT-5 Mini measured
SimpleQA Verified	21.6%	25.4%	Qwen3.5 Plus 2026-04-20
LMArena Text: science	1371	Not measured	Only GPT-5 Mini measured
LMArena Text: medicine and healthcare	1380	Not measured	Only GPT-5 Mini measured
LMArena Text: legal and government	1375	Not measured	Only GPT-5 Mini measured
LMArena Text: business and finance	1358	Not measured	Only GPT-5 Mini measured
FACTS Benchmark Suite	38.6%	Not measured	Only GPT-5 Mini 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 Mini and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-5 Mini	Qwen3.5 Plus 2026-04-20	Leader
Design Arena: websites	1125	Not measured	Only GPT-5 Mini measured
Design Arena: UI components	1103	Not measured	Only GPT-5 Mini measured
Design Arena: game dev	1129	Not measured	Only GPT-5 Mini measured
Design Arena: data viz	1131	Not measured	Only GPT-5 Mini measured
Design Arena: 3D	1036	Not measured	Only GPT-5 Mini measured
Design Arena: all code categories	1114	Not measured	Only GPT-5 Mini measured
Design Arena: SVG	1090	Not measured	Only GPT-5 Mini measured
Design Arena: ASCII art	1125	Not measured	Only GPT-5 Mini measured
Neither model has a result on the other 1 board here

GeneralLike-for-likePublic boards, shown as published, kept out of the index11

General benchmarks for GPT-5 Mini and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-5 Mini	Qwen3.5 Plus 2026-04-20	Leader
SAGE (Vals AI)	43.0%	30.4%	GPT-5 Mini
MedScribe (Vals AI)	80.6%	Not measured	Only GPT-5 Mini measured
IFBench	75.4%	Not measured	Only GPT-5 Mini measured
Long context reasoning (AA-LCR)	72.3%	Not measured	Only GPT-5 Mini measured
DTBench	80.5%	80.5%	Tie
LMCA	34.2%	36.4%	Qwen3.5 Plus 2026-04-20
Fiction.LiveBench	69.4%	Not measured	Only GPT-5 Mini measured
Creative writing (Lech Mazur)	83.1%	Not measured	Only GPT-5 Mini 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
LMArena Text	1373	Not measured	Only GPT-5 Mini measured
LMArena Text: instruction following	1357	Not measured	Only GPT-5 Mini measured
LMArena Text: creative writing	1325	Not measured	Only GPT-5 Mini measured
LMArena Vision	1202	Not measured	Only GPT-5 Mini measured
LMArena Text: English	1379	Not measured	Only GPT-5 Mini measured
LMArena Text: non-English	1363	Not measured	Only GPT-5 Mini measured
LMArena Text: Chinese	1386	Not measured	Only GPT-5 Mini measured
LMArena Text: German	1366	Not measured	Only GPT-5 Mini measured
LMArena Text: Japanese	1341	Not measured	Only GPT-5 Mini measured
LMArena Text: Korean	1308	Not measured	Only GPT-5 Mini measured
LMArena Text: French	1386	Not measured	Only GPT-5 Mini measured
LMArena Text: Spanish	1354	Not measured	Only GPT-5 Mini measured
LMArena Text: Russian	1362	Not measured	Only GPT-5 Mini measured
LMArena Text: Polish	1378	Not measured	Only GPT-5 Mini measured
LMArena Text: multi-turn	1363	Not measured	Only GPT-5 Mini measured
LMArena Text: longer queries	1355	Not measured	Only GPT-5 Mini measured
LMArena Text: writing and language	1344	Not measured	Only GPT-5 Mini measured
LMArena Text: entertainment and media	1340	Not measured	Only GPT-5 Mini measured
LMArena Vision: English	1216	Not measured	Only GPT-5 Mini measured
LMArena Vision: Chinese	1214	Not measured	Only GPT-5 Mini measured
LMArena Vision: reading text	1199	Not measured	Only GPT-5 Mini measured
LMArena Vision: humor	1205	Not measured	Only GPT-5 Mini measured
LMArena Vision: captioning	1217	Not measured	Only GPT-5 Mini measured
LMArena Vision: recognizing things	1226	Not measured	Only GPT-5 Mini measured
LMArena Vision: creative writing	1181	Not measured	Only GPT-5 Mini measured
MultiChallenge	59.0%	Not measured	Only GPT-5 Mini 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 Mini and Qwen3.5 Plus 2026-04-20
Benchmark	GPT-5 Mini	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 Mini$0.0013Fits 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 Mini$0.018Fits in one request

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

GPT-5 Mini costs less

Agent loop

200K input + 10K output tokens

GPT-5 Mini$0.070Fits in one request

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

GPT-5 Mini 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 Mini and Qwen3.5 Plus 2026-04-20
Specification	OpenAI GPT-5 Mini	Qwen3.5 Plus 2026-04-20
Maker	OpenAI	Qwen
Weights	No public weights listed	No public weights listed
Released	August 7, 2025	April 27, 2026
Context window	400K	1M
Input $/Mtok	$0.25	$0.30
Output $/Mtok	$2.00	$1.80
Coding index	34.2	39.5
Independent measurements behind it	2	2
Cost per solved task	$0.08	$1.35
Source	OpenRouter listing	OpenRouter listing

Questions

Is GPT-5 Mini 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 34.2 for GPT-5 Mini. Pick GPT-5 Mini for a lower cost per solved task ($0.08 against $1.35) and work measured by LiveCodeBench (Vals AI) or MMMU Pro (Vals AI), where it leads.

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

GPT-5 Mini costs $0.25 per million input tokens and $2.00 per million output tokens; Qwen3.5 Plus 2026-04-20 costs $0.30 and $1.80. Per solved SWE-bench Verified task, GPT-5 Mini costs $0.08 and Qwen3.5 Plus 2026-04-20 $1.35.

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

Qwen3.5 Plus 2026-04-20, with 1M tokens against 400K.

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

22 benchmarks have a result for both models as of October 22, 2026. GPT-5 Mini's coding index rests on 2 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.

Compare next

Embed this comparison on your site

Free under CC BY 4.0, while the source link stays visible. Preview the frame · Terms and other embeds

<iframe src="https://llmbenchmark.ai/embed/compare/gpt-5-mini-vs-qwen3-5-plus-20260420" title="GPT-5 Mini vs Qwen3.5 Plus 2026-04-20, LLMBenchmark.ai" width="100%" height="360" style="border:0;max-width:100%" loading="lazy"></iframe>
<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/gpt-5-mini-vs-qwen3-5-plus-20260420">LLMBenchmark.ai, GPT-5 Mini vs Qwen3.5 Plus 2026-04-20</a></p>

GPT-5 Mini 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