Noometry

Model comparison

GPT-5.4 mini vs GPT-5.5 Instant

GPT-5.4 mini is the stronger model overall, scoring 44.8 to 42.5 on the Noometry Index.

Last verified . 26 shared benchmarks.

GPT-5.4 mini OpenAI

44.8

Rank #69 Confirmed

GPT-5.5 Instant OpenAI

42.5

Rank #99 Confirmed

Summary

  • They share 26 benchmarks with published results for both. GPT-5.4 mini scores higher in 5 categories and GPT-5.5 Instant in 4 categories; 5 gaps are clear of the uncertainty.
  • The widest gap is in math, where GPT-5.4 mini leads 45.4 to 26.1.
  • The biggest single-benchmark swing is FrontierMath (Tiers 1-3): 51.2% for GPT-5.4 mini and 26.3% for GPT-5.5 Instant.

Side by side

GPT-5.4 miniGPT-5.5 Instant
ProviderOpenAIOpenAI
Noometry Index44.842.5
Released2026-03-172026-05-05
WeightsProprietaryProprietary
Context window400K—
Max output128K—
Input $ / M tokens$0.75—
Output $ / M tokens$4.50—
Results tracked4627

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Category by category

Coding GPT-5.4 mini leads

GPT-5.4 mini: 45.0 (#67), GPT-5.5 Instant: 43.7 (#73)

BenchmarkGPT-5.4 miniGPT-5.5 Instant
SciCode49.9%48.6%
LMArena Coding14381433
FrontierCode27%—
LMArena WebDev1397—
WeirdML60.3%—
ALE-Bench1,189—

Agentic & Tool Use Not comparable

GPT-5.4 mini: 29.6 (#74), GPT-5.5 Instant: —

BenchmarkGPT-5.4 miniGPT-5.5 Instant
DeepResearch Bench36.3%—

Reasoning GPT-5.4 mini leads

GPT-5.4 mini: 30.3 (#77), GPT-5.5 Instant: 24.2 (#149)

BenchmarkGPT-5.4 miniGPT-5.5 Instant
CritPt10%0%
Chess Puzzles24%12%
LMArena Hard Prompts14241426
Epoch Capabilities Index148.83142.48
ARC-AGI-218.9%—
Kagi LLM Benchmark37.9%—
NYT Connections (extended)61.8%—
ARC-AGI-163.7%—
Thematic Generalization61.7%—
Mystery Game Puzzles11%—
DTBench80%—
LMCA40.8%—
ForecastBench57—

Math GPT-5.4 mini leads

GPT-5.4 mini: 45.4 (#63), GPT-5.5 Instant: 26.1 (#241)

BenchmarkGPT-5.4 miniGPT-5.5 Instant
FrontierMath (Tiers 1-3)51.2%26.3%
FrontierMath Tier 49.8%2.4%
OTIS Mock AIME 2024-202588.9%68.1%
LMArena Math14181420
ProofBench21%—
FrontierMath (Feb 2025 set)28.3%—
FrontierMath Tier 4 (v1)2.1%—

Knowledge GPT-5.4 mini leads

GPT-5.4 mini: 51.4 (#62), GPT-5.5 Instant: 48.9 (#68)

BenchmarkGPT-5.4 miniGPT-5.5 Instant
GPQA Diamond86.9%82.5%
LMArena Expert14341409
SimpleQA Verified29.4%—
Vectara Hallucination Rate5.5%—

Multimodal Too close to call

GPT-5.4 mini: 39.0 (#51), GPT-5.5 Instant: 39.3 (#48)

BenchmarkGPT-5.4 miniGPT-5.5 Instant
LMArena Vision12451250
LMArena Document—1403

Multilingual Too close to call

GPT-5.4 mini: 52.1 (#94), GPT-5.5 Instant: 53.0 (#76)

BenchmarkGPT-5.4 miniGPT-5.5 Instant
LMArena Non-English14051417
LMArena Chinese14461457
LMArena French14401428
LMArena German14071410
LMArena Japanese13751408
LMArena Korean13691393
LMArena Russian14171430
LMArena Spanish14031430

Instruction Following Too close to call

GPT-5.4 mini: 74.3 (#99), GPT-5.5 Instant: 74.4 (#94)

BenchmarkGPT-5.4 miniGPT-5.5 Instant
LMArena Instruction Following14051407

Long Context Too close to call

GPT-5.4 mini: 42.9 (#107), GPT-5.5 Instant: 43.4 (#92)

BenchmarkGPT-5.4 miniGPT-5.5 Instant
LMArena Longer Query14071422

Writing & Preference GPT-5.4 mini leads

GPT-5.4 mini: 64.2 (#56), GPT-5.5 Instant: 62.0 (#81)

BenchmarkGPT-5.4 miniGPT-5.5 Instant
LMArena Text14111419
LMArena Creative Writing13701420
LMArena Multi-Turn14291434
EQ-Bench Creative Writing1665—

Frequently asked questions

Is GPT-5.4 mini better than GPT-5.5 Instant?

GPT-5.4 mini is the stronger model overall, scoring 44.8 to 42.5 on the Noometry Index.

Is GPT-5.4 mini or GPT-5.5 Instant better for coding?

GPT-5.4 mini scores higher on coding benchmarks: 45.0 versus 43.7 in the Noometry coding category.

How many benchmarks do GPT-5.4 mini and GPT-5.5 Instant share?

26 benchmarks have published results for both models. GPT-5.4 mini has 46 scored results on Noometry and GPT-5.5 Instant has 27.

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