Noometry

Model comparison

Claude Opus 4.5 vs GPT-5 Mini

Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 41.8 on the Noometry Index. GPT-5 Mini costs 15× less per token, which makes it the better buy when Claude Opus 4.5's lead doesn't matter for your workload.

Last verified . 48 shared benchmarks.

Claude Opus 4.5 Anthropic

50.5

Rank #47 Confirmed

GPT-5 Mini OpenAI

41.8

Rank #128 Confirmed

Summary

  • They share 48 benchmarks with published results for both. Claude Opus 4.5 scores higher in 8 categories and GPT-5 Mini in 2 categories; 10 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Opus 4.5 leads 42.6 to 23.9.
  • The biggest single-benchmark swing is ARC-AGI-2: 37.6% for Claude Opus 4.5 and 4.4% for GPT-5 Mini.
  • GPT-5 Mini is cheaper at $0.25 / $2 per million input/output tokens, against $5 / $25 for Claude Opus 4.5.
  • GPT-5 Mini accepts more context: 400K tokens versus 200K.

Side by side

Claude Opus 4.5GPT-5 Mini
ProviderAnthropicOpenAI
Noometry Index50.541.8
Released2025-11-012025-08-07
WeightsProprietaryProprietary
Context window200K400K
Max output64K128K
Input $ / M tokens$5$0.25
Output $ / M tokens$25$2
Results tracked6960

Sponsored placements are available on pages like this one. Advertise on Noometry

Category by category

Coding Claude Opus 4.5 leads

Claude Opus 4.5: 54.8 (#27), GPT-5 Mini: 40.1 (#146)

BenchmarkClaude Opus 4.5GPT-5 Mini
SWE-bench Verified76.7%64.7%
SWE-bench Verified (bash only)76.8%59.8%
SWE-bench Multilingual70.7%39.7%
WeirdML63.7%52.7%
LMArena Coding15041406
ALE-Bench1,025799.77
AlgoTune1.771.38
LMArena WebDev1494—
SciCode—39.2%
GSO26.5%—

Agentic & Tool Use Claude Opus 4.5 leads

Claude Opus 4.5: 47.3 (#12), GPT-5 Mini: 31.1 (#70)

BenchmarkClaude Opus 4.5GPT-5 Mini
Terminal-Bench63.1%34.8%
Berkeley Function Calling Leaderboard77.5%55.5%
Vending-Bench 24,967-31.18
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%—
BALROG43.5%—
LMArena Search1180—
METR Time Horizons75%—

Reasoning Claude Opus 4.5 leads

Claude Opus 4.5: 42.6 (#51), GPT-5 Mini: 23.9 (#168)

BenchmarkClaude Opus 4.5GPT-5 Mini
ARC-AGI-237.6%4.4%
Kagi LLM Benchmark80.2%70.3%
ARC-AGI-180%54.3%
Chess Puzzles12%30%
EnigmaEval11.9%8.2%
LMArena Hard Prompts14761380
Mystery Game Puzzles22%10%
DTBench89.9%80.5%
LMCA44.5%34.2%
Epoch Capabilities Index150.09145.52
ForecastBench60.761
SimpleBench62%—
NYT Connections (extended)52.5%—
CritPt—0%
EBR-Bench14.3%—

Math GPT-5 Mini leads

Claude Opus 4.5: 38.6 (#132), GPT-5 Mini: 46.7 (#69)

BenchmarkClaude Opus 4.5GPT-5 Mini
FrontierMath (Tiers 1-3)34.4%46.7%
FrontierMath Tier 44.9%12.2%
OTIS Mock AIME 2024-202586.1%86.7%
ProofBench36%9%
LMArena Math14631378
FrontierMath (Feb 2025 set)20.7%27.2%
FrontierMath Tier 4 (v1)4.2%6.3%
Omni-MATH—72.2%
MATH Level 5—97.8%

Knowledge Claude Opus 4.5 leads

Claude Opus 4.5: 56.5 (#44), GPT-5 Mini: 45.6 (#86)

BenchmarkClaude Opus 4.5GPT-5 Mini
GPQA Diamond86%75%
Humanity's Last Exam25.2%19.4%
SimpleQA Verified45.7%21.6%
Vectara Hallucination Rate10.9%12.9%
LMArena Expert14871379
MMLU-Pro—83.5%
Confabulations—13.3%
GPQA (HELM)—75.6%

Multimodal GPT-5 Mini leads

Claude Opus 4.5: 31.4 (#107), GPT-5 Mini: 35.6 (#85)

BenchmarkClaude Opus 4.5GPT-5 Mini
VPCT40%40.2%
LMArena Vision—1202
GeoBench75%—
Furniture Assembly28.3%—
LMArena Document1462—

Multilingual Claude Opus 4.5 leads

Claude Opus 4.5: 54.3 (#47), GPT-5 Mini: 48.9 (#137)

BenchmarkClaude Opus 4.5GPT-5 Mini
LMArena Non-English14381363
LMArena Chinese14701385
LMArena French14711386
LMArena German14491366
LMArena Japanese14161341
LMArena Korean14241308
LMArena Russian14471362
LMArena Spanish14581355

Instruction Following Claude Opus 4.5 leads

Claude Opus 4.5: 77.5 (#19), GPT-5 Mini: 76.2 (#46)

BenchmarkClaude Opus 4.5GPT-5 Mini
LMArena Instruction Following14781357
IFEval—92.7%

Long Context Claude Opus 4.5 leads

Claude Opus 4.5: 46.5 (#22), GPT-5 Mini: 41.9 (#132)

BenchmarkClaude Opus 4.5GPT-5 Mini
LMArena Longer Query14801355
Fiction.LiveBench—69.4%
CL-bench21.1%—

Writing & Preference Claude Opus 4.5 leads

Claude Opus 4.5: 68.1 (#28), GPT-5 Mini: 55.2 (#148)

BenchmarkClaude Opus 4.5GPT-5 Mini
LMArena Text14511373
LMArena Creative Writing14451325
EQ-Bench Creative Writing16871313
LMArena Multi-Turn14661363
Short-Story Creative Writing—83.1%
WildBench—85.5%

Frequently asked questions

Is Claude Opus 4.5 better than GPT-5 Mini?

Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 41.8 on the Noometry Index. GPT-5 Mini costs 15× 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-5 Mini?

GPT-5 Mini is cheaper. It lists at $0.25 per million input tokens and $2 per million output tokens; Claude Opus 4.5 lists at $5 and $25.

Is Claude Opus 4.5 or GPT-5 Mini better for coding?

Claude Opus 4.5 scores higher on coding benchmarks: 54.8 versus 40.1 in the Noometry coding category.

Which has the bigger context window?

GPT-5 Mini does, with 400K tokens against 200K.

How many benchmarks do Claude Opus 4.5 and GPT-5 Mini share?

48 benchmarks have published results for both models. Claude Opus 4.5 has 69 scored results on Noometry and GPT-5 Mini has 60.

Related comparisons

Go deeper