Noometry

Model comparison

GPT-5.1-Codex vs Qwen3.6 Plus

Qwen3.6 Plus is the stronger model overall, scoring 47.5 to 38.6 on the Noometry Index.

Last verified . 2 shared benchmarks.

GPT-5.1-Codex OpenAI

38.6

Rank #186 Reported

Qwen3.6 Plus Alibaba (Qwen)

47.5

Rank #62 Confirmed

Summary

  • They share 2 benchmarks with published results for both. GPT-5.1-Codex scores higher in 1 category and Qwen3.6 Plus in 1 category; 2 gaps are clear of the uncertainty.
  • The widest gap is in math, where Qwen3.6 Plus leads 51.8 to 30.3.
  • Qwen3.6 Plus is cheaper at $0.50 / $3 per million input/output tokens, against $1.25 / $10 for GPT-5.1-Codex.
  • Qwen3.6 Plus accepts more context: 1M tokens versus 400K.

Side by side

GPT-5.1-CodexQwen3.6 Plus
ProviderOpenAIAlibaba (Qwen)
Noometry Index38.647.5
Released2025-11-122026-03-31
WeightsProprietaryProprietary
Context window400K1M
Max output128K66K
Input $ / M tokens$1.25$0.50
Output $ / M tokens$10$3
Results tracked637

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Category by category

Coding GPT-5.1-Codex leads

GPT-5.1-Codex: 41.9 (#116), Qwen3.6 Plus: 40.8 (#130)

BenchmarkGPT-5.1-CodexQwen3.6 Plus
LMArena WebDev13371461
ALE-Bench1,245670.15
SWE-bench Verified—57.9%
SWE-bench Verified (bash only)66%—
SciCode—40.7%
LMArena Coding—1467

Agentic & Tool Use Not comparable

GPT-5.1-Codex: 38.0 (#33), Qwen3.6 Plus: —

BenchmarkGPT-5.1-CodexQwen3.6 Plus
Terminal-Bench60.4%—
METR Time Horizons70.8%—
Vending-Bench 2—5,115

Reasoning Not comparable

GPT-5.1-Codex: —, Qwen3.6 Plus: 29.3 (#93)

BenchmarkGPT-5.1-CodexQwen3.6 Plus
NYT Connections (extended)—60.3%
CritPt—2.9%
Chess Puzzles—17%
Thematic Generalization—59.5%
LMArena Hard Prompts—1449
Mystery Game Puzzles—12%
DTBench—81.9%
LMCA—33.1%
Epoch Capabilities Index—147.65

Math Qwen3.6 Plus leads

GPT-5.1-Codex: 30.3 (#235), Qwen3.6 Plus: 51.8 (#54)

BenchmarkGPT-5.1-CodexQwen3.6 Plus
FrontierMath (Tiers 1-3)—38.2%
OTIS Mock AIME 2024-2025—93.3%
ProofBench9%—
LMArena Math—1450
FrontierMath (Feb 2025 set)—26.2%
FrontierMath Tier 4 (v1)—8.3%

Knowledge Not comparable

GPT-5.1-Codex: —, Qwen3.6 Plus: 56.1 (#45)

BenchmarkGPT-5.1-CodexQwen3.6 Plus
GPQA Diamond—88.4%
SimpleQA Verified—44.1%
LMArena Expert—1454

Multilingual Not comparable

GPT-5.1-Codex: —, Qwen3.6 Plus: 53.3 (#70)

BenchmarkGPT-5.1-CodexQwen3.6 Plus
LMArena Non-English—1424
LMArena Chinese—1477
LMArena French—1455
LMArena German—1452
LMArena Japanese—1389
LMArena Korean—1379
LMArena Russian—1434
LMArena Spanish—1432

Instruction Following Not comparable

GPT-5.1-Codex: —, Qwen3.6 Plus: 75.0 (#74)

BenchmarkGPT-5.1-CodexQwen3.6 Plus
LMArena Instruction Following—1425

Long Context Not comparable

GPT-5.1-Codex: —, Qwen3.6 Plus: 45.2 (#49)

BenchmarkGPT-5.1-CodexQwen3.6 Plus
CL-bench—20.3%
LMArena Longer Query—1439

Writing & Preference Not comparable

GPT-5.1-Codex: —, Qwen3.6 Plus: 62.2 (#82)

BenchmarkGPT-5.1-CodexQwen3.6 Plus
LMArena Text—1437
LMArena Creative Writing—1404
LMArena Multi-Turn—1438

Frequently asked questions

Is GPT-5.1-Codex better than Qwen3.6 Plus?

Qwen3.6 Plus is the stronger model overall, scoring 47.5 to 38.6 on the Noometry Index.

Which is cheaper, GPT-5.1-Codex or Qwen3.6 Plus?

Qwen3.6 Plus is cheaper. It lists at $0.50 per million input tokens and $3 per million output tokens; GPT-5.1-Codex lists at $1.25 and $10.

Is GPT-5.1-Codex or Qwen3.6 Plus better for coding?

GPT-5.1-Codex scores higher on coding benchmarks: 41.9 versus 40.8 in the Noometry coding category.

Which has the bigger context window?

Qwen3.6 Plus does, with 1M tokens against 400K.

How many benchmarks do GPT-5.1-Codex and Qwen3.6 Plus share?

2 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Qwen3.6 Plus has 37.

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