Noometry

Model comparison

GPT-4.1 mini vs GPT-5.1

GPT-5.1 is the stronger model overall, scoring 48.8 to 33.5 on the Noometry Index. GPT-4.1 mini costs 4.9× less per token, which makes it the better buy when GPT-5.1's lead doesn't matter for your workload.

Last verified . 38 shared benchmarks.

GPT-4.1 mini OpenAI

33.5

Rank #232 Confirmed

GPT-5.1 OpenAI

48.8

Rank #47 Confirmed

Summary

  • They share 38 benchmarks with published results for both. GPT-4.1 mini scores higher in 1 category and GPT-5.1 in 9 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where GPT-5.1 leads 39.9 to 10.9.
  • The biggest single-benchmark swing is ARC-AGI-1: 3.5% for GPT-4.1 mini and 72.8% for GPT-5.1.
  • GPT-4.1 mini is cheaper at $0.40 / $1.60 per million input/output tokens, against $1.25 / $10 for GPT-5.1.
  • GPT-4.1 mini accepts more context: 1.05M tokens versus 400K.

Side by side

GPT-4.1 miniGPT-5.1
ProviderOpenAIOpenAI
Noometry Index33.548.8
Released2025-04-142025-11-13
WeightsProprietaryProprietary
Context window1.05M400K
Max output33K128K
Input $ / M tokens$0.40$1.25
Output $ / M tokens$1.60$10
Results tracked4763

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Category by category

Coding GPT-5.1 leads

GPT-4.1 mini: 30.4 (#286), GPT-5.1: 46.9 (#59)

BenchmarkGPT-4.1 miniGPT-5.1
SWE-bench Verified (bash only)23.9%66%
SciCode40.4%43.3%
WeirdML37.6%60.8%
LMArena Coding13671454
SWE-bench Verified—68%
Aider Polyglot32.4%—
LMArena WebDev—1395
GSO—13.7%
BigCodeBench Instruct48.9%—
LiveBench Coding—72.5%
CadEval16%—
ALE-Bench—1,192

Agentic & Tool Use Too close to call

GPT-4.1 mini: 33.0 (#52), GPT-5.1: 32.5 (#55)

BenchmarkGPT-4.1 miniGPT-5.1
Terminal-Bench—47.6%
Berkeley Function Calling Leaderboard50.5%—
DeepResearch Bench—42.8%
LMArena Search—1199
Vending-Bench 2—1,473

Reasoning GPT-5.1 leads

GPT-4.1 mini: 10.9 (#335), GPT-5.1: 39.9 (#50)

BenchmarkGPT-4.1 miniGPT-5.1
ARC-AGI-20%17.6%
ARC-AGI-13.5%72.8%
CritPt0%4.9%
Chess Puzzles7%32%
LMArena Hard Prompts13491457
Mystery Game Puzzles7%19%
DTBench68.8%90.1%
LMCA21.1%43.9%
Epoch Capabilities Index135.01149.66
SimpleBench—53.2%
Kagi LLM Benchmark48.6%—
EnigmaEval—11.2%
LiveBench Reasoning—95.8%
LiveBench Data Analysis—72.1%
ForecastBench—58.1
LiveBench—78.8%

Math GPT-5.1 leads

GPT-4.1 mini: 23.1 (#264), GPT-5.1: 50.3 (#45)

BenchmarkGPT-4.1 miniGPT-5.1
OTIS Mock AIME 2024-202544.7%88.6%
Omni-MATH49.1%46.4%
LMArena Math13431446
FrontierMath (Feb 2025 set)4.5%31%
FrontierMath (Tiers 1-3)6.7%—
LiveBench Math—94.5%
MATH Level 587.3%—
FrontierMath Tier 4 (v1)—12.5%

Knowledge GPT-5.1 leads

GPT-4.1 mini: 34.7 (#183), GPT-5.1: 50.5 (#65)

BenchmarkGPT-4.1 miniGPT-5.1
GPQA Diamond65.8%87.6%
SimpleQA Verified12.7%48%
MMLU-Pro78.3%57.9%
GPQA (HELM)61.4%44.2%
LMArena Expert13381470
Humanity's Last Exam—23.7%
Vectara Hallucination Rate—10.9%

Multimodal GPT-5.1 leads

GPT-4.1 mini: 35.2 (#77), GPT-5.1: 44.0 (#17)

BenchmarkGPT-4.1 miniGPT-5.1
LMArena Vision11811250
VPCT—58.7%
LMArena Document—1403

Multilingual GPT-5.1 leads

GPT-4.1 mini: 45.9 (#161), GPT-5.1: 54.0 (#51)

BenchmarkGPT-4.1 miniGPT-5.1
LMArena Non-English13181431
LMArena Chinese13291495
LMArena French13571451
LMArena German13491439
LMArena Japanese12911453
LMArena Korean12981401
LMArena Russian13241435
LMArena Spanish13191430

Instruction Following GPT-5.1 leads

GPT-4.1 mini: 73.9 (#113), GPT-5.1: 84.0 (#1)

BenchmarkGPT-4.1 miniGPT-5.1
IFEval90.4%93.5%
LMArena Instruction Following13321442
LiveBench Instruction Following—93.3%

Long Context GPT-5.1 leads

GPT-4.1 mini: 31.8 (#270), GPT-5.1: 47.6 (#14)

BenchmarkGPT-4.1 miniGPT-5.1
LMArena Longer Query13441448
Fiction.LiveBench44.4%—
CL-bench—23.7%
CL-bench Life—17.3%

Writing & Preference GPT-5.1 leads

GPT-4.1 mini: 48.8 (#193), GPT-5.1: 64.7 (#53)

BenchmarkGPT-4.1 miniGPT-5.1
LMArena Text13411443
LMArena Creative Writing13001427
WildBench83.8%86.3%
LMArena Multi-Turn13541449
EQ-Bench Creative Writing1147—
LiveBench Language—80.2%

Frequently asked questions

Is GPT-4.1 mini better than GPT-5.1?

GPT-5.1 is the stronger model overall, scoring 48.8 to 33.5 on the Noometry Index. GPT-4.1 mini costs 4.9× less per token, which makes it the better buy when GPT-5.1's lead doesn't matter for your workload.

Which is cheaper, GPT-4.1 mini or GPT-5.1?

GPT-4.1 mini is cheaper. It lists at $0.40 per million input tokens and $1.60 per million output tokens; GPT-5.1 lists at $1.25 and $10.

Is GPT-4.1 mini or GPT-5.1 better for coding?

GPT-5.1 scores higher on coding benchmarks: 46.9 versus 30.4 in the Noometry coding category.

Which has the bigger context window?

GPT-4.1 mini does, with 1.05M tokens against 400K.

How many benchmarks do GPT-4.1 mini and GPT-5.1 share?

38 benchmarks have published results for both models. GPT-4.1 mini has 47 scored results on Noometry and GPT-5.1 has 63.

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