Noometry

Model comparison

GPT-5.3 Chat vs GPT-5.4 mini

GPT-5.4 mini is the stronger model overall, scoring 45.0 to 42.8 on the Noometry Index.

Last verified . 18 shared benchmarks.

GPT-5.3 Chat OpenAI

42.8

Rank #109 Confirmed

GPT-5.4 mini OpenAI

45.0

Rank #76 Confirmed

Summary

  • They share 18 benchmarks with published results for both. GPT-5.3 Chat scores higher in 0 categories and GPT-5.4 mini in 8 categories; 6 gaps are clear of the uncertainty.
  • The widest gap is in knowledge, where GPT-5.4 mini leads 51.5 to 38.8.
  • GPT-5.4 mini is cheaper at $0.75 / $4.50 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.
  • GPT-5.4 mini accepts more context: 400K tokens versus 128K.

Side by side

GPT-5.3 ChatGPT-5.4 mini
ProviderOpenAIOpenAI
Noometry Index42.845.0
Released2026-03-032026-03-17
WeightsProprietaryProprietary
Context window128K400K
Max output16K128K
Input $ / M tokens$1.75$0.75
Output $ / M tokens$14$4.50
Results tracked1846

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Category by category

Coding GPT-5.4 mini leads

GPT-5.3 Chat: 41.4 (#124), GPT-5.4 mini: 45.2 (#72)

BenchmarkGPT-5.3 ChatGPT-5.4 mini
LMArena Coding14081438
FrontierCode—27%
LMArena WebDev—1397
SciCode—49.9%
WeirdML—60.3%
ALE-Bench—1,189

Agentic & Tool Use Not comparable

GPT-5.3 Chat: —, GPT-5.4 mini: 29.9 (#81)

BenchmarkGPT-5.3 ChatGPT-5.4 mini
DeepResearch Bench—36.3%

Reasoning GPT-5.4 mini leads

GPT-5.3 Chat: 28.5 (#102), GPT-5.4 mini: 30.4 (#85)

BenchmarkGPT-5.3 ChatGPT-5.4 mini
LMArena Hard Prompts13991424
ARC-AGI-2—18.9%
Kagi LLM Benchmark—37.9%
NYT Connections (extended)—61.8%
ARC-AGI-1—63.7%
CritPt—10%
Chess Puzzles—24%
Thematic Generalization—61.7%
Mystery Game Puzzles—11%
DTBench—80%
LMCA—40.8%
Epoch Capabilities Index—148.84
ForecastBench—57

Math GPT-5.4 mini leads

GPT-5.3 Chat: 38.2 (#142), GPT-5.4 mini: 45.5 (#75)

BenchmarkGPT-5.3 ChatGPT-5.4 mini
LMArena Math13891419
FrontierMath (Tiers 1-3)—51.2%
FrontierMath Tier 4—9.8%
OTIS Mock AIME 2024-2025—88.9%
ProofBench—21%
FrontierMath (Feb 2025 set)—28.3%
FrontierMath Tier 4 (v1)—2.1%

Knowledge GPT-5.4 mini leads

GPT-5.3 Chat: 38.8 (#140), GPT-5.4 mini: 51.5 (#67)

BenchmarkGPT-5.3 ChatGPT-5.4 mini
LMArena Expert13971435
GPQA Diamond—86.9%
SimpleQA Verified—29.4%
Vectara Hallucination Rate—5.5%

Multimodal Not comparable

GPT-5.3 Chat: —, GPT-5.4 mini: 39.7 (#56)

BenchmarkGPT-5.3 ChatGPT-5.4 mini
LMArena Vision—1245

Multilingual GPT-5.4 mini leads

GPT-5.3 Chat: 50.3 (#124), GPT-5.4 mini: 51.9 (#96)

BenchmarkGPT-5.3 ChatGPT-5.4 mini
LMArena Non-English13821405
LMArena Chinese14321446
LMArena French13971440
LMArena German13841409
LMArena Japanese13521374
LMArena Korean13461368
LMArena Russian14001417
LMArena Spanish13711405

Instruction Following GPT-5.4 mini leads

GPT-5.3 Chat: 72.8 (#129), GPT-5.4 mini: 74.1 (#102)

BenchmarkGPT-5.3 ChatGPT-5.4 mini
LMArena Instruction Following13781405

Long Context Too close to call

GPT-5.3 Chat: 42.6 (#120), GPT-5.4 mini: 43.0 (#112)

BenchmarkGPT-5.3 ChatGPT-5.4 mini
LMArena Longer Query13961407

Writing & Preference Too close to call

GPT-5.3 Chat: 63.1 (#68), GPT-5.4 mini: 64.0 (#58)

BenchmarkGPT-5.3 ChatGPT-5.4 mini
LMArena Text13891412
LMArena Creative Writing13551370
EQ-Bench Creative Writing16901665
LMArena Multi-Turn14121429

Frequently asked questions

Is GPT-5.3 Chat better than GPT-5.4 mini?

GPT-5.4 mini is the stronger model overall, scoring 45.0 to 42.8 on the Noometry Index.

Which is cheaper, GPT-5.3 Chat or GPT-5.4 mini?

GPT-5.4 mini is cheaper. It lists at $0.75 per million input tokens and $4.50 per million output tokens; GPT-5.3 Chat lists at $1.75 and $14.

Is GPT-5.3 Chat or GPT-5.4 mini better for coding?

GPT-5.4 mini scores higher on coding benchmarks: 45.2 versus 41.4 in the Noometry coding category.

Which has the bigger context window?

GPT-5.4 mini does, with 400K tokens against 128K.

How many benchmarks do GPT-5.3 Chat and GPT-5.4 mini share?

18 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and GPT-5.4 mini has 46.

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