Noometry

Model comparison

GPT-5.5 Instant vs GPT-6 Sol

GPT-6 Sol is the stronger model overall, scoring 61.8 to 42.7 on the Noometry Index.

Last verified . 25 shared benchmarks.

GPT-5.5 Instant OpenAI

42.7

Rank #110 Confirmed

GPT-6 Sol OpenAI

61.8

Rank #12 Confirmed

Summary

  • They share 25 benchmarks with published results for both. GPT-5.5 Instant scores higher in 2 categories and GPT-6 Sol in 7 categories; 7 gaps are clear of the uncertainty.
  • The widest gap is in math, where GPT-6 Sol leads 87.2 to 26.5.
  • The biggest single-benchmark swing is FrontierMath Tier 4: 2.4% for GPT-5.5 Instant and 90% for GPT-6 Sol.

Side by side

GPT-5.5 InstantGPT-6 Sol
ProviderOpenAIOpenAI
Noometry Index42.761.8
Released2026-05-052026-09-22
WeightsProprietaryProprietary
Context window—1.05M
Max output—128K
Input $ / M tokens—$2
Output $ / M tokens—$10
Results tracked2745

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Category by category

Coding GPT-6 Sol leads

GPT-5.5 Instant: 44.3 (#74), GPT-6 Sol: 60.1 (#11)

BenchmarkGPT-5.5 InstantGPT-6 Sol
SciCode48.6%57.6%
LMArena Coding14331447
DeepSWE—68.8%
FrontierCode—49.3%
LMArena WebDev—1688
ALE-Bench—2,462

Agentic & Tool Use Not comparable

GPT-5.5 Instant: —, GPT-6 Sol: 37.2 (#36)

BenchmarkGPT-5.5 InstantGPT-6 Sol
APEX-Agents—54.3%
GDP.pdf—26.4%
Vending-Bench 2—14,428

Reasoning GPT-6 Sol leads

GPT-5.5 Instant: 24.9 (#155), GPT-6 Sol: 74.0 (#9)

BenchmarkGPT-5.5 InstantGPT-6 Sol
CritPt0%30.9%
LMArena Hard Prompts14261418
Epoch Capabilities Index142.52162.72
ARC-AGI-2—89.6%
NYT Connections (extended)—90.1%
ARC-AGI-1—95.5%
Chess Puzzles12%—
EBR-Bench—53.3%
Mystery Game Puzzles—56%
DTBench—97.3%
LMCA—59.1%

Math GPT-6 Sol leads

GPT-5.5 Instant: 26.5 (#259), GPT-6 Sol: 87.2 (#7)

BenchmarkGPT-5.5 InstantGPT-6 Sol
FrontierMath (Tiers 1-3)26.3%89.8%
FrontierMath Tier 42.4%90%
OTIS Mock AIME 2024-202568.1%100%
LMArena Math14201402
ProofBench—83%

Knowledge GPT-6 Sol leads

GPT-5.5 Instant: 48.9 (#74), GPT-6 Sol: 64.8 (#15)

BenchmarkGPT-5.5 InstantGPT-6 Sol
GPQA Diamond82.5%94.3%
LMArena Expert14091439
SimpleQA Verified—60.7%
Vectara Hallucination Rate—6.5%

Multimodal GPT-6 Sol leads

GPT-5.5 Instant: 40.0 (#52), GPT-6 Sol: 47.6 (#10)

BenchmarkGPT-5.5 InstantGPT-6 Sol
LMArena Vision12501245
Blueprint-Bench 2—36.9%
Furniture Assembly—58.3%
LMArena Document1403—

Multilingual GPT-5.5 Instant leads

GPT-5.5 Instant: 52.8 (#80), GPT-6 Sol: 50.5 (#118)

BenchmarkGPT-5.5 InstantGPT-6 Sol
LMArena Non-English14171385
LMArena Chinese14561405
LMArena French14281410
LMArena German14111390
LMArena Japanese14081385
LMArena Korean13921341
LMArena Russian14311401
LMArena Spanish14291384

Instruction Following Too close to call

GPT-5.5 Instant: 74.2 (#100), GPT-6 Sol: 74.5 (#94)

BenchmarkGPT-5.5 InstantGPT-6 Sol
LMArena Instruction Following14061412

Long Context Too close to call

GPT-5.5 Instant: 43.4 (#96), GPT-6 Sol: 43.1 (#108)

BenchmarkGPT-5.5 InstantGPT-6 Sol
LMArena Longer Query14221411

Writing & Preference GPT-6 Sol leads

GPT-5.5 Instant: 61.8 (#85), GPT-6 Sol: 71.9 (#18)

BenchmarkGPT-5.5 InstantGPT-6 Sol
LMArena Text14191395
LMArena Creative Writing14191378
LMArena Multi-Turn14331412
EQ-Bench Creative Writing—2125

Frequently asked questions

Is GPT-5.5 Instant better than GPT-6 Sol?

GPT-6 Sol is the stronger model overall, scoring 61.8 to 42.7 on the Noometry Index.

Is GPT-5.5 Instant or GPT-6 Sol better for coding?

GPT-6 Sol scores higher on coding benchmarks: 60.1 versus 44.3 in the Noometry coding category.

How many benchmarks do GPT-5.5 Instant and GPT-6 Sol share?

25 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and GPT-6 Sol has 45.

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