Noometry

Model comparison

GPT-5 Pro vs GPT-6.1 Sol

GPT-6.1 Sol is the stronger model overall, scoring 65.6 to 46.4 on the Noometry Index.

Last verified . 5 shared benchmarks.

GPT-5 Pro OpenAI

46.4

Rank #64 Confirmed

GPT-6.1 Sol OpenAI

65.6

Rank #6 Confirmed

Summary

  • They share 5 benchmarks with published results for both. GPT-5 Pro scores higher in 0 categories and GPT-6.1 Sol in 4 categories; 4 gaps are clear of the uncertainty.
  • The widest gap is in math, where GPT-6.1 Sol leads 93.7 to 48.5.
  • The biggest single-benchmark swing is FrontierMath Tier 4: 19.5% for GPT-5 Pro and 100% for GPT-6.1 Sol.
  • GPT-6.1 Sol is cheaper at $2 / $10 per million input/output tokens, against $15 / $120 for GPT-5 Pro.
  • GPT-6.1 Sol accepts more context: 1.05M tokens versus 400K.

Side by side

GPT-5 ProGPT-6.1 Sol
ProviderOpenAIOpenAI
Noometry Index46.465.6
Released2025-10-062026-09-29
WeightsProprietaryProprietary
Context window400K1.05M
Max output272K128K
Input $ / M tokens$15$2
Output $ / M tokens$120$10
Results tracked1234

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Category by category

Coding GPT-6.1 Sol leads

GPT-5 Pro: 44.0 (#80), GPT-6.1 Sol: 63.2 (#8)

BenchmarkGPT-5 ProGPT-6.1 Sol
DeepSWE—75.2%
FrontierCode—50.2%
LMArena WebDev—1755
SciCode—55.8%
WeirdML60.4%—
LMArena Coding—1487
AlgoTune1.31—

Agentic & Tool Use Not comparable

GPT-5 Pro: —, GPT-6.1 Sol: 39.6 (#26)

BenchmarkGPT-5 ProGPT-6.1 Sol
APEX-Agents—60%
GDP.pdf—32%

Reasoning GPT-6.1 Sol leads

GPT-5 Pro: 38.9 (#62), GPT-6.1 Sol: 81.9 (#2)

BenchmarkGPT-5 ProGPT-6.1 Sol
ARC-AGI-218.3%94.2%
ARC-AGI-170.2%98.5%
Epoch Capabilities Index150.28166.09
SimpleBench61.6%—
Kagi LLM Benchmark76.8%—
NYT Connections (extended)—95.5%
CritPt—31.7%
Chess Puzzles—61%
EnigmaEval18.8%—
EBR-Bench—54.3%
LMArena Hard Prompts—1466
Mystery Game Puzzles—80%

Math GPT-6.1 Sol leads

GPT-5 Pro: 48.5 (#63), GPT-6.1 Sol: 93.7 (#1)

BenchmarkGPT-5 ProGPT-6.1 Sol
FrontierMath (Tiers 1-3)55.8%93.7%
FrontierMath Tier 419.5%100%
OTIS Mock AIME 2024-2025—100%
ProofBench—99%
LMArena Math—1464
FrontierMath Tier 4 (v1)14.6%—

Knowledge GPT-6.1 Sol leads

GPT-5 Pro: 56.7 (#42), GPT-6.1 Sol: 71.8 (#4)

BenchmarkGPT-5 ProGPT-6.1 Sol
GPQA Diamond—95.4%
Humanity's Last Exam31.6%—
SimpleQA Verified—73.9%
LMArena Expert—1502

Multimodal Not comparable

GPT-5 Pro: —, GPT-6.1 Sol: 52.7 (#5)

BenchmarkGPT-5 ProGPT-6.1 Sol
LMArena Vision—1288
Furniture Assembly—80%

Multilingual Not comparable

GPT-5 Pro: —, GPT-6.1 Sol: 54.3 (#46)

BenchmarkGPT-5 ProGPT-6.1 Sol
LMArena Non-English—1438
LMArena Chinese—1477
LMArena Russian—1455

Instruction Following Not comparable

GPT-5 Pro: —, GPT-6.1 Sol: 77.0 (#29)

BenchmarkGPT-5 ProGPT-6.1 Sol
LMArena Instruction Following—1468

Long Context Not comparable

GPT-5 Pro: —, GPT-6.1 Sol: 44.9 (#54)

BenchmarkGPT-5 ProGPT-6.1 Sol
LMArena Longer Query—1465

Writing & Preference Not comparable

GPT-5 Pro: —, GPT-6.1 Sol: 63.6 (#63)

BenchmarkGPT-5 ProGPT-6.1 Sol
LMArena Text—1447
LMArena Creative Writing—1432
LMArena Multi-Turn—1449

Frequently asked questions

Is GPT-5 Pro better than GPT-6.1 Sol?

GPT-6.1 Sol is the stronger model overall, scoring 65.6 to 46.4 on the Noometry Index.

Which is cheaper, GPT-5 Pro 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 Pro lists at $15 and $120.

Is GPT-5 Pro or GPT-6.1 Sol better for coding?

GPT-6.1 Sol scores higher on coding benchmarks: 63.2 versus 44.0 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 Pro and GPT-6.1 Sol share?

5 benchmarks have published results for both models. GPT-5 Pro has 12 scored results on Noometry and GPT-6.1 Sol has 34.

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