Noometry

Model comparison

Claude Opus 4.5 vs GPT-4o mini

Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 25.5 on the Noometry Index. GPT-4o mini costs 38× less per token, which makes it the better buy when Claude Opus 4.5's lead doesn't matter for your workload.

Last verified . 34 shared benchmarks.

Claude Opus 4.5 Anthropic

50.5

Rank #47 Confirmed

GPT-4o mini OpenAI

25.5

Rank #343 Confirmed

Summary

  • They share 34 benchmarks with published results for both. Claude Opus 4.5 scores higher in 10 categories and GPT-4o mini in 0 categories; 10 gaps are clear of the uncertainty.
  • The widest gap is in knowledge, where Claude Opus 4.5 leads 56.5 to 17.7.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 86.1% for Claude Opus 4.5 and 6.9% for GPT-4o mini.
  • GPT-4o mini is cheaper at $0.15 / $0.60 per million input/output tokens, against $5 / $25 for Claude Opus 4.5.
  • Claude Opus 4.5 accepts more context: 200K tokens versus 128K.

Side by side

Claude Opus 4.5GPT-4o mini
ProviderAnthropicOpenAI
Noometry Index50.525.5
Released2025-11-012024-07-18
WeightsProprietaryProprietary
Context window200K128K
Max output64K16K
Input $ / M tokens$5$0.15
Output $ / M tokens$25$0.60
Results tracked6960

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Category by category

Coding Claude Opus 4.5 leads

Claude Opus 4.5: 54.8 (#27), GPT-4o mini: 22.0 (#335)

BenchmarkClaude Opus 4.5GPT-4o mini
WeirdML63.7%11.8%
LMArena Coding15041290
SWE-bench Verified76.7%—
SWE-bench Verified (bash only)76.8%—
Aider Polyglot—3.6%
LMArena WebDev1494—
SWE-bench Multilingual70.7%—
GSO26.5%—
BigCodeBench Instruct—46.1%
LiveBench Coding—43.1%
BigCodeBench Complete—57.4%
ALE-Bench1,025—
AlgoTune1.77—
HumanEval+—83.5%
MBPP+—72.2%

Agentic & Tool Use Claude Opus 4.5 leads

Claude Opus 4.5: 47.3 (#12), GPT-4o mini: 27.5 (#101)

BenchmarkClaude Opus 4.5GPT-4o mini
BALROG43.5%17.4%
Terminal-Bench63.1%—
Berkeley Function Calling Leaderboard77.5%—
GDPval45.5%—
Remote Labor Index3.8%—
τ²-bench Airline84%—
τ²-bench Banking24.7%—
τ²-bench Retail79.6%—
τ²-bench Telecom92.3%—
Cybench82%—
DeepResearch Bench54.8%—
OSWorld66.3%—
LMArena Search1180—
METR Time Horizons75%—
Vending-Bench 24,967—

Reasoning Claude Opus 4.5 leads

Claude Opus 4.5: 42.6 (#51), GPT-4o mini: 8.7 (#347)

BenchmarkClaude Opus 4.5GPT-4o mini
ARC-AGI-237.6%0%
SimpleBench62%10.7%
Kagi LLM Benchmark80.2%28.8%
Chess Puzzles12%0%
LMArena Hard Prompts14761267
Mystery Game Puzzles22%12%
DTBench89.9%54.4%
LMCA44.5%10.4%
Epoch Capabilities Index150.09126.56
NYT Connections (extended)52.5%—
ARC-AGI-180%—
EnigmaEval11.9%—
EBR-Bench14.3%—
LiveBench Reasoning—32.8%
LiveBench Data Analysis—50%
ForecastBench60.7—
LiveBench—41.3%
PIQA—88.7%

Math Claude Opus 4.5 leads

Claude Opus 4.5: 38.6 (#132), GPT-4o mini: 10.4 (#314)

BenchmarkClaude Opus 4.5GPT-4o mini
FrontierMath (Tiers 1-3)34.4%0.7%
OTIS Mock AIME 2024-202586.1%6.9%
LMArena Math14631267
FrontierMath Tier 44.9%—
ProofBench36%—
Omni-MATH—28%
LiveBench Math—36.3%
MATH Level 5—52.6%
FrontierMath (Feb 2025 set)20.7%—
FrontierMath Tier 4 (v1)4.2%—
GSM8K—91.3%

Knowledge Claude Opus 4.5 leads

Claude Opus 4.5: 56.5 (#44), GPT-4o mini: 17.7 (#284)

BenchmarkClaude Opus 4.5GPT-4o mini
GPQA Diamond86%37.7%
SimpleQA Verified45.7%8.3%
LMArena Expert14871235
Humanity's Last Exam25.2%—
MMLU-Pro—60.3%
Confabulations—37.2%
Vectara Hallucination Rate10.9%—
GPQA (HELM)—36.8%
BoolQ—88.7%
MMLU—81.8%

Multimodal Claude Opus 4.5 leads

Claude Opus 4.5: 31.4 (#107), GPT-4o mini: 25.9 (#122)

BenchmarkClaude Opus 4.5GPT-4o mini
GeoBench75%64%
VPCT40%34%
LMArena Vision—1066
Video-MME—64.8%
Furniture Assembly28.3%—
LMArena Document1462—

Multilingual Claude Opus 4.5 leads

Claude Opus 4.5: 54.3 (#47), GPT-4o mini: 42.0 (#199)

BenchmarkClaude Opus 4.5GPT-4o mini
LMArena Non-English14381266
LMArena Chinese14701265
LMArena French14711297
LMArena German14491272
LMArena Japanese14161216
LMArena Korean14241195
LMArena Russian14471275
LMArena Spanish14581276

Instruction Following Claude Opus 4.5 leads

Claude Opus 4.5: 77.5 (#19), GPT-4o mini: 61.9 (#239)

BenchmarkClaude Opus 4.5GPT-4o mini
LMArena Instruction Following14781258
LiveBench Instruction Following—56.8%
IFEval—78.2%

Long Context Claude Opus 4.5 leads

Claude Opus 4.5: 46.5 (#22), GPT-4o mini: 39.1 (#186)

BenchmarkClaude Opus 4.5GPT-4o mini
LMArena Longer Query14801289
CL-bench21.1%—

Writing & Preference Claude Opus 4.5 leads

Claude Opus 4.5: 68.1 (#28), GPT-4o mini: 39.5 (#248)

BenchmarkClaude Opus 4.5GPT-4o mini
LMArena Text14511286
LMArena Creative Writing14451268
EQ-Bench Creative Writing1687873
LMArena Multi-Turn14661285
Short-Story Creative Writing—67.2%
WildBench—79.1%
LiveBench Language—28.6%

Frequently asked questions

Is Claude Opus 4.5 better than GPT-4o mini?

Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 25.5 on the Noometry Index. GPT-4o mini costs 38× less per token, which makes it the better buy when Claude Opus 4.5's lead doesn't matter for your workload.

Which is cheaper, Claude Opus 4.5 or GPT-4o mini?

GPT-4o mini is cheaper. It lists at $0.15 per million input tokens and $0.60 per million output tokens; Claude Opus 4.5 lists at $5 and $25.

Is Claude Opus 4.5 or GPT-4o mini better for coding?

Claude Opus 4.5 scores higher on coding benchmarks: 54.8 versus 22.0 in the Noometry coding category.

Which has the bigger context window?

Claude Opus 4.5 does, with 200K tokens against 128K.

How many benchmarks do Claude Opus 4.5 and GPT-4o mini share?

34 benchmarks have published results for both models. Claude Opus 4.5 has 69 scored results on Noometry and GPT-4o mini has 60.

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