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GPT-5.1-Codex vs Qwen3 Coder 480B A35B

Updated October 21, 2026. 21 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace GPT-5.1-Codex Replace Qwen3 Coder 480B A35B
GPT-5.1-CodexOpenAI
Coding
50.5
Overall
23.7
Output $/M
$10.00
20
Qwen3 Coder 480B A35BQwen
Coding
50.0
Overall
11.9
Output $/M
$1.00
1
vs boards won of 21 shared

Decision reading

GPT-5.1-Codex and Qwen3 Coder 480B A35B are level for coding, 50.5 against 50.0 on the Vibe Coding Index, so price and context decide.

Pick Qwen3 Coder 480B A35B when output tokens cost 10.0x less, or when the benchmark that matters is SWE-bench Verified, where it leads. Pick GPT-5.1-Codex when the context window is larger, 400K against 262K tokens, or when what matters is LMArena WebDev or LiveCodeBench (Artificial Analysis run), where it leads.

Model AGPT-5.1-CodexOpenAI50.5/1002 independent benchmarks$0.892 per solved taskModel BQwen3 Coder 480B A35BQwen50.0/1002 independent benchmarksNo cost per solved task
Shared results
21
GPT-5.1-Codex only
5
Qwen3 Coder 480B A35B only
31
Like-for-like categories
8 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

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.

At a glance

Coding index
GPT-5.1-Codex 50.5 from 2 benchmarks, Qwen3 Coder 480B A35B 50.0 from 2 benchmarks.
Widest category
Math, 56.4 points apart on average over 2 shared benchmarks.
Widest single gap
AA Math Index: GPT-5.1-Codex 95.7 against Qwen3 Coder 480B A35B 39.3, 56.4 points apart on a 0 to 100 scale.
Output price
GPT-5.1-Codex $10.00 against Qwen3 Coder 480B A35B $1.00 per million output tokens, 10.0x apart.
Context window
GPT-5.1-Codex takes 400K tokens, Qwen3 Coder 480B A35B 262K.

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
CategoryGPT-5.1-CodexBarsQwen3 Coder 480B A35BTies
Coding61
Intelligence10
Agentic work10
Reasoning20
Math20
Knowledge10
Web design50
General20
All shared boards201
CodingLike-for-likeFour of these boards feed the Vibe Coding Index61
Coding benchmarks for GPT-5.1-Codex and Qwen3 Coder 480B A35B
BenchmarkGPT-5.1-CodexQwen3 Coder 480B A35BLeader
SWE-bench Verified66.0%69.6%Qwen3 Coder 480B A35B
LMArena WebDev13371275GPT-5.1-Codex
LiveCodeBench (Vals AI)85.5%Not measuredOnly GPT-5.1-Codex measured
Vibe Code Bench (Vals AI)13.1%Not measuredOnly GPT-5.1-Codex measured
LiveCodeBench (Artificial Analysis run)84.9%58.5%GPT-5.1-Codex
Terminal-Bench Hard (Artificial Analysis run)34.8%18.9%GPT-5.1-Codex
Terminal-Bench57.8%27.2%GPT-5.1-Codex
GSO-BenchNot measured4.9%Only Qwen3 Coder 480B A35B measured
WeirdMLNot measured41.2%Only Qwen3 Coder 480B A35B measured
ALE-Bench1244.9461.4GPT-5.1-Codex
LMArena Text: codingNot measured1412Only Qwen3 Coder 480B A35B measured
LMArena Text: software and ITNot measured1393Only Qwen3 Coder 480B A35B measured
LMArena WebDev: ReactNot measured1257Only Qwen3 Coder 480B A35B measured
LMArena WebDev: HTML13461287GPT-5.1-Codex
Neither model has a result on the other 24 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for GPT-5.1-Codex and Qwen3 Coder 480B A35B
BenchmarkGPT-5.1-CodexQwen3 Coder 480B A35BLeader
AA Intelligence Index23.711.9GPT-5.1-Codex
Neither model has a result on the other 1 board here
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for GPT-5.1-Codex and Qwen3 Coder 480B A35B
BenchmarkGPT-5.1-CodexQwen3 Coder 480B A35BLeader
Design Arena: agents building web apps1018Not measuredOnly GPT-5.1-Codex measured
Design Arena: agents building full-stack apps1086Not measuredOnly GPT-5.1-Codex measured
Design Arena: agents building mobile apps1191Not measuredOnly GPT-5.1-Codex measured
τ²-Bench Telecom83.0%43.6%GPT-5.1-Codex
Neither model has a result on the other 35 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index20
Reasoning benchmarks for GPT-5.1-Codex and Qwen3 Coder 480B A35B
BenchmarkGPT-5.1-CodexQwen3 Coder 480B A35BLeader
GPQA Diamond (Artificial Analysis run)86.0%61.8%GPT-5.1-Codex
Humanity's Last Exam (Artificial Analysis run)25.7%4.5%GPT-5.1-Codex
LMArena Text: hard promptsNot measured1372Only Qwen3 Coder 480B A35B measured
LMArena Text: expertNot measured1338Only Qwen3 Coder 480B A35B measured
LMArena Text: hard prompts in EnglishNot measured1380Only Qwen3 Coder 480B A35B measured
Neither model has a result on the other 16 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index20
Math benchmarks for GPT-5.1-Codex and Qwen3 Coder 480B A35B
BenchmarkGPT-5.1-CodexQwen3 Coder 480B A35BLeader
AA Math Index95.739.3GPT-5.1-Codex
AIME 2025 (Artificial Analysis run)95.7%39.3%GPT-5.1-Codex
LMArena Text: mathNot measured1365Only Qwen3 Coder 480B A35B measured
LMArena Text: mathematical workNot measured1367Only Qwen3 Coder 480B A35B measured
Neither model has a result on the other 9 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index10
Knowledge benchmarks for GPT-5.1-Codex and Qwen3 Coder 480B A35B
BenchmarkGPT-5.1-CodexQwen3 Coder 480B A35BLeader
MMLU Pro (Artificial Analysis run)86.0%78.8%GPT-5.1-Codex
LMArena Text: scienceNot measured1347Only Qwen3 Coder 480B A35B measured
LMArena Text: medicine and healthcareNot measured1347Only Qwen3 Coder 480B A35B measured
LMArena Text: legal and governmentNot measured1358Only Qwen3 Coder 480B A35B measured
LMArena Text: business and financeNot measured1343Only Qwen3 Coder 480B A35B measured
Neither model has a result on the other 12 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index50
Web design benchmarks for GPT-5.1-Codex and Qwen3 Coder 480B A35B
BenchmarkGPT-5.1-CodexQwen3 Coder 480B A35BLeader
Design Arena: websites11621159GPT-5.1-Codex
Design Arena: UI components12371112GPT-5.1-Codex
Design Arena: game dev11381099GPT-5.1-Codex
Design Arena: data viz12131084GPT-5.1-Codex
Design Arena: all code categories11531143GPT-5.1-Codex
Neither model has a result on the other 4 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index20
General benchmarks for GPT-5.1-Codex and Qwen3 Coder 480B A35B
BenchmarkGPT-5.1-CodexQwen3 Coder 480B A35BLeader
IFBench70.0%40.5%GPT-5.1-Codex
Long context reasoning (AA-LCR)69.3%45.7%GPT-5.1-Codex
LMArena TextNot measured1357Only Qwen3 Coder 480B A35B measured
LMArena Text: instruction followingNot measured1355Only Qwen3 Coder 480B A35B measured
LMArena Text: creative writingNot measured1333Only Qwen3 Coder 480B A35B measured
LMArena Text: EnglishNot measured1359Only Qwen3 Coder 480B A35B measured
LMArena Text: non-EnglishNot measured1346Only Qwen3 Coder 480B A35B measured
LMArena Text: ChineseNot measured1357Only Qwen3 Coder 480B A35B measured
LMArena Text: GermanNot measured1325Only Qwen3 Coder 480B A35B measured
LMArena Text: JapaneseNot measured1311Only Qwen3 Coder 480B A35B measured
LMArena Text: KoreanNot measured1305Only Qwen3 Coder 480B A35B measured
LMArena Text: FrenchNot measured1398Only Qwen3 Coder 480B A35B measured
LMArena Text: SpanishNot measured1360Only Qwen3 Coder 480B A35B measured
LMArena Text: RussianNot measured1366Only Qwen3 Coder 480B A35B measured
LMArena Text: PolishNot measured1344Only Qwen3 Coder 480B A35B measured
LMArena Text: multi-turnNot measured1366Only Qwen3 Coder 480B A35B measured
LMArena Text: longer queriesNot measured1378Only Qwen3 Coder 480B A35B measured
LMArena Text: writing and languageNot measured1340Only Qwen3 Coder 480B A35B measured
LMArena Text: entertainment and mediaNot measured1317Only Qwen3 Coder 480B A35B measured
Neither model has a result on the other 27 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-5.1-Codex and Qwen3 Coder 480B A35B
BenchmarkGPT-5.1-CodexQwen3 Coder 480B A35BLeader
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-5.1-Codex$0.0063Fits in one request
Qwen3 Coder 480B A35B$0.0008Fits in one request

Qwen3 Coder 480B A35B costs less

Repository review

50K input + 3K output tokens

GPT-5.1-Codex$0.092Fits in one request
Qwen3 Coder 480B A35B$0.018Fits in one request

Qwen3 Coder 480B A35B costs less

Agent loop

200K input + 10K output tokens

GPT-5.1-Codex$0.350Fits in one request
Qwen3 Coder 480B A35B$0.070Fits in one request

Qwen3 Coder 480B A35B 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-5.1-Codex and Qwen3 Coder 480B A35B
SpecificationOpenAI GPT-5.1-CodexQwen3 Coder 480B A35B
MakerOpenAIQwen
WeightsNo public weights listedOpen weights
ReleasedNovember 13, 2025July 23, 2025
Context window400K262K
Input $/Mtok$1.25$0.30
Output $/Mtok$10.00$1.00
Coding index50.550.0
Independent measurements behind it22
Cost per solved task$0.892Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.1-Codex better than Qwen3 Coder 480B A35B for coding?

GPT-5.1-Codex and Qwen3 Coder 480B A35B are level for coding, 50.5 against 50.0 on the Vibe Coding Index, so price and context decide. Pick Qwen3 Coder 480B A35B when output tokens cost 10.0x less, or when the benchmark that matters is SWE-bench Verified, where it leads. Pick GPT-5.1-Codex when the context window is larger, 400K against 262K tokens, or when what matters is LMArena WebDev or LiveCodeBench (Artificial Analysis run), where it leads.

Which is cheaper, GPT-5.1-Codex or Qwen3 Coder 480B A35B?

GPT-5.1-Codex costs $1.25 per million input tokens and $10.00 per million output tokens; Qwen3 Coder 480B A35B costs $0.30 and $1.00. Cost per solved task is known for GPT-5.1-Codex only.

Which has the bigger context window, GPT-5.1-Codex or Qwen3 Coder 480B A35B?

GPT-5.1-Codex, with 400K tokens against 262K.

How many benchmarks is the GPT-5.1-Codex vs Qwen3 Coder 480B A35B comparison based on?

21 benchmarks have a result for both models as of October 21, 2026. GPT-5.1-Codex's coding index rests on 2 independent benchmarks and Qwen3 Coder 480B A35B's on 2. Where only one model has a result, the page says so instead of naming a winner.

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