Noometry

Model comparison

GPT-5.2 Codex vs GPT-6.1 Sol

GPT-6.1 Sol is the stronger model overall, scoring 65.6 to 42.6 on the Noometry Index.

Last verified . 1 shared benchmarks.

GPT-5.2 Codex OpenAI

42.6

Rank #111 Reported

GPT-6.1 Sol OpenAI

65.6

Rank #6 Confirmed

Summary

  • They share 1 benchmark with published results for both. GPT-5.2 Codex scores higher in 1 category and GPT-6.1 Sol in 1 category; 2 gaps are clear of the uncertainty.
  • The widest gap is in coding, where GPT-6.1 Sol leads 63.2 to 45.5.
  • GPT-6.1 Sol is cheaper at $2 / $10 per million input/output tokens, against $1.75 / $14 for GPT-5.2 Codex.
  • GPT-6.1 Sol accepts more context: 1.05M tokens versus 400K.

Side by side

GPT-5.2 CodexGPT-6.1 Sol
ProviderOpenAIOpenAI
Noometry Index42.665.6
Released2025-12-182026-09-29
WeightsProprietaryProprietary
Context window400K1.05M
Max output128K128K
Input $ / M tokens$1.75$2
Output $ / M tokens$14$10
Results tracked534

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Category by category

Coding GPT-6.1 Sol leads

GPT-5.2 Codex: 45.5 (#71), GPT-6.1 Sol: 63.2 (#8)

BenchmarkGPT-5.2 CodexGPT-6.1 Sol
LMArena WebDev13391755
DeepSWE—75.2%
FrontierCode—50.2%
SWE-bench Verified (bash only)72.8%—
SWE-bench Multilingual66.3%—
SciCode—55.8%
LMArena Coding—1487
ALE-Bench1,300—

Agentic & Tool Use GPT-5.2 Codex leads

GPT-5.2 Codex: 41.0 (#22), GPT-6.1 Sol: 39.6 (#26)

BenchmarkGPT-5.2 CodexGPT-6.1 Sol
Terminal-Bench66.5%—
APEX-Agents—60%
GDP.pdf—32%

Reasoning Not comparable

GPT-5.2 Codex: —, GPT-6.1 Sol: 81.9 (#2)

BenchmarkGPT-5.2 CodexGPT-6.1 Sol
ARC-AGI-2—94.2%
NYT Connections (extended)—95.5%
ARC-AGI-1—98.5%
CritPt—31.7%
Chess Puzzles—61%
EBR-Bench—54.3%
LMArena Hard Prompts—1466
Mystery Game Puzzles—80%
Epoch Capabilities Index—166.09

Math Not comparable

GPT-5.2 Codex: —, GPT-6.1 Sol: 93.7 (#1)

BenchmarkGPT-5.2 CodexGPT-6.1 Sol
FrontierMath (Tiers 1-3)—93.7%
FrontierMath Tier 4—100%
OTIS Mock AIME 2024-2025—100%
ProofBench—99%
LMArena Math—1464

Knowledge Not comparable

GPT-5.2 Codex: —, GPT-6.1 Sol: 71.8 (#4)

BenchmarkGPT-5.2 CodexGPT-6.1 Sol
GPQA Diamond—95.4%
SimpleQA Verified—73.9%
LMArena Expert—1502

Multimodal Not comparable

GPT-5.2 Codex: —, GPT-6.1 Sol: 52.7 (#5)

BenchmarkGPT-5.2 CodexGPT-6.1 Sol
LMArena Vision—1288
Furniture Assembly—80%

Multilingual Not comparable

GPT-5.2 Codex: —, GPT-6.1 Sol: 54.3 (#46)

BenchmarkGPT-5.2 CodexGPT-6.1 Sol
LMArena Non-English—1438
LMArena Chinese—1477
LMArena Russian—1455

Instruction Following Not comparable

GPT-5.2 Codex: —, GPT-6.1 Sol: 77.0 (#29)

BenchmarkGPT-5.2 CodexGPT-6.1 Sol
LMArena Instruction Following—1468

Long Context Not comparable

GPT-5.2 Codex: —, GPT-6.1 Sol: 44.9 (#54)

BenchmarkGPT-5.2 CodexGPT-6.1 Sol
LMArena Longer Query—1465

Writing & Preference Not comparable

GPT-5.2 Codex: —, GPT-6.1 Sol: 63.6 (#63)

BenchmarkGPT-5.2 CodexGPT-6.1 Sol
LMArena Text—1447
LMArena Creative Writing—1432
LMArena Multi-Turn—1449

Frequently asked questions

Is GPT-5.2 Codex better than GPT-6.1 Sol?

GPT-6.1 Sol is the stronger model overall, scoring 65.6 to 42.6 on the Noometry Index.

Which is cheaper, GPT-5.2 Codex or GPT-6.1 Sol?

GPT-6.1 Sol is cheaper. It lists at $2 per million input tokens and $10 per million output tokens; GPT-5.2 Codex lists at $1.75 and $14.

Is GPT-5.2 Codex or GPT-6.1 Sol better for coding?

GPT-6.1 Sol scores higher on coding benchmarks: 63.2 versus 45.5 in the Noometry coding category.

Which has the bigger context window?

GPT-6.1 Sol does, with 1.05M tokens against 400K.

How many benchmarks do GPT-5.2 Codex and GPT-6.1 Sol share?

1 benchmark has published results for both models. GPT-5.2 Codex has 5 scored results on Noometry and GPT-6.1 Sol has 34.

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