Noometry

Model comparison

Claude Opus 4.5 vs o4-mini

Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 41.6 on the Noometry Index. o4-mini costs 5.2× less per token, which makes it the better buy when Claude Opus 4.5's lead doesn't matter for your workload.

Last verified . 47 shared benchmarks.

Claude Opus 4.5 Anthropic

50.5

Rank #47 Confirmed

o4-mini OpenAI

41.6

Rank #132 Confirmed

Summary

  • They share 47 benchmarks with published results for both. Claude Opus 4.5 scores higher in 8 categories and o4-mini in 2 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Opus 4.5 leads 42.6 to 24.6.
  • The biggest single-benchmark swing is SWE-bench Verified (bash only): 76.8% for Claude Opus 4.5 and 45% for o4-mini.
  • o4-mini is cheaper at $1.10 / $4.40 per million input/output tokens, against $5 / $25 for Claude Opus 4.5.

Side by side

Claude Opus 4.5o4-mini
ProviderAnthropicOpenAI
Noometry Index50.541.6
Released2025-11-012025-04-16
WeightsProprietaryProprietary
Context window200K200K
Max output64K100K
Input $ / M tokens$5$1.10
Output $ / M tokens$25$4.40
Results tracked6960

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Category by category

Coding Claude Opus 4.5 leads

Claude Opus 4.5: 54.8 (#27), o4-mini: 40.9 (#127)

BenchmarkClaude Opus 4.5o4-mini
SWE-bench Verified (bash only)76.8%45%
GSO26.5%3.6%
WeirdML63.7%52.6%
LMArena Coding15041368
ALE-Bench1,025826.17
AlgoTune1.771.72
SWE-bench Verified76.7%—
Aider Polyglot—72%
LMArena WebDev1494—
SWE-bench Multilingual70.7%—
CadEval—62%

Agentic & Tool Use Claude Opus 4.5 leads

Claude Opus 4.5: 47.3 (#12), o4-mini: 32.6 (#61)

BenchmarkClaude Opus 4.5o4-mini
Berkeley Function Calling Leaderboard77.5%53.2%
GDPval45.5%25.3%
METR Time Horizons75%63.9%
Terminal-Bench63.1%—
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—
Vending-Bench 24,967—

Reasoning Claude Opus 4.5 leads

Claude Opus 4.5: 42.6 (#51), o4-mini: 24.6 (#162)

BenchmarkClaude Opus 4.5o4-mini
ARC-AGI-237.6%6.1%
SimpleBench62%38.7%
Kagi LLM Benchmark80.2%67.6%
ARC-AGI-180%58.7%
Chess Puzzles12%26%
EnigmaEval11.9%9.2%
LMArena Hard Prompts14761351
Mystery Game Puzzles22%5%
DTBench89.9%77.6%
LMCA44.5%26.5%
Epoch Capabilities Index150.09145.64
ForecastBench60.761.8
NYT Connections (extended)52.5%—
CritPt—0.6%
EBR-Bench14.3%—

Math o4-mini leads

Claude Opus 4.5: 38.6 (#132), o4-mini: 40.8 (#89)

BenchmarkClaude Opus 4.5o4-mini
FrontierMath (Tiers 1-3)34.4%36.1%
FrontierMath Tier 44.9%4.9%
OTIS Mock AIME 2024-202586.1%81.7%
LMArena Math14631389
FrontierMath (Feb 2025 set)20.7%24.8%
FrontierMath Tier 4 (v1)4.2%6.3%
ProofBench36%—
Omni-MATH—72%
MATH Level 5—97.8%

Knowledge Claude Opus 4.5 leads

Claude Opus 4.5: 56.5 (#44), o4-mini: 43.6 (#91)

BenchmarkClaude Opus 4.5o4-mini
GPQA Diamond86%79.6%
Humanity's Last Exam25.2%18.1%
SimpleQA Verified45.7%19.6%
Vectara Hallucination Rate10.9%18.6%
LMArena Expert14871343
MMLU-Pro—82%
Confabulations—15.8%
GPQA (HELM)—73.5%

Multimodal o4-mini leads

Claude Opus 4.5: 31.4 (#107), o4-mini: 40.2 (#49)

BenchmarkClaude Opus 4.5o4-mini
GeoBench75%64%
VPCT40%57.5%
LMArena Vision—1194
Furniture Assembly28.3%—
LMArena Document1462—

Multilingual Claude Opus 4.5 leads

Claude Opus 4.5: 54.3 (#47), o4-mini: 47.0 (#154)

BenchmarkClaude Opus 4.5o4-mini
LMArena Non-English14381337
LMArena Chinese14701354
LMArena French14711364
LMArena German14491336
LMArena Japanese14161308
LMArena Korean14241312
LMArena Russian14471334
LMArena Spanish14581347

Instruction Following Claude Opus 4.5 leads

Claude Opus 4.5: 77.5 (#19), o4-mini: 75.2 (#68)

BenchmarkClaude Opus 4.5o4-mini
LMArena Instruction Following14781321
IFEval—92.8%

Long Context Too close to call

Claude Opus 4.5: 46.5 (#22), o4-mini: 45.5 (#33)

BenchmarkClaude Opus 4.5o4-mini
LMArena Longer Query14801315
Fiction.LiveBench—77.8%
CL-bench21.1%—

Writing & Preference Claude Opus 4.5 leads

Claude Opus 4.5: 68.1 (#28), o4-mini: 54.0 (#152)

BenchmarkClaude Opus 4.5o4-mini
LMArena Text14511353
LMArena Creative Writing14451294
LMArena Multi-Turn14661350
Short-Story Creative Writing—75%
EQ-Bench Creative Writing1687—
WildBench—85.4%

Frequently asked questions

Is Claude Opus 4.5 better than o4-mini?

Claude Opus 4.5 is the stronger model overall, scoring 50.5 to 41.6 on the Noometry Index. o4-mini costs 5.2× 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 o4-mini?

o4-mini is cheaper. It lists at $1.10 per million input tokens and $4.40 per million output tokens; Claude Opus 4.5 lists at $5 and $25.

Is Claude Opus 4.5 or o4-mini better for coding?

Claude Opus 4.5 scores higher on coding benchmarks: 54.8 versus 40.9 in the Noometry coding category.

Which has the bigger context window?

Both accept 200K tokens.

How many benchmarks do Claude Opus 4.5 and o4-mini share?

47 benchmarks have published results for both models. Claude Opus 4.5 has 69 scored results on Noometry and o4-mini has 60.

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