Noometry

Model comparison

Claude Sonnet 4.5 vs o4-mini

Claude Sonnet 4.5 is the stronger model overall, scoring 44.0 to 41.6 on the Noometry Index. o4-mini costs 3.1× less per token, which makes it the better buy when Claude Sonnet 4.5's lead doesn't matter for your workload.

Last verified . 53 shared benchmarks.

Claude Sonnet 4.5 Anthropic

44.0

Rank #76 Confirmed

o4-mini OpenAI

41.6

Rank #119 Confirmed

Summary

  • They share 53 benchmarks with published results for both. Claude Sonnet 4.5 scores higher in 6 categories and o4-mini in 4 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in writing & preference, where Claude Sonnet 4.5 leads 66.7 to 54.2.
  • The biggest single-benchmark swing is SWE-bench Verified (bash only): 71.4% for Claude Sonnet 4.5 and 45% for o4-mini.
  • o4-mini is cheaper at $1.10 / $4.40 per million input/output tokens, against $3 / $15 for Claude Sonnet 4.5.
  • Claude Sonnet 4.5 accepts more context: 1M tokens versus 200K.

Side by side

Claude Sonnet 4.5o4-mini
ProviderAnthropicOpenAI
Noometry Index44.041.6
Released2025-09-292025-04-16
WeightsProprietaryProprietary
Context window1M200K
Max output64K100K
Input $ / M tokens$3$1.10
Output $ / M tokens$15$4.40
Results tracked7360

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Category by category

Coding Claude Sonnet 4.5 leads

Claude Sonnet 4.5: 47.8 (#54), o4-mini: 41.6 (#110)

BenchmarkClaude Sonnet 4.5o4-mini
SWE-bench Verified (bash only)71.4%45%
GSO14.7%3.6%
WeirdML47.7%52.6%
LMArena Coding14891369
ALE-Bench796.15826.17
AlgoTune1.521.72
SWE-bench Verified71.3%—
Aider Polyglot—72%
LMArena WebDev1393—
SWE-bench Multilingual67%—
SciCode44.7%—
CadEval—62%

Agentic & Tool Use Claude Sonnet 4.5 leads

Claude Sonnet 4.5: 38.1 (#30), o4-mini: 32.3 (#57)

BenchmarkClaude Sonnet 4.5o4-mini
Berkeley Function Calling Leaderboard73.2%53.2%
GDPval42.5%25.3%
METR Time Horizons67.4%63.9%
Terminal-Bench46.5%—
Remote Labor Index2.1%—
τ²-bench Airline72%—
τ²-bench Banking25.3%—
τ²-bench Retail72.4%—
τ²-bench Telecom84.9%—
Cybench60%—
DeepResearch Bench52.6%—
OSWorld62.9%—
LMArena Search1159—
Vending-Bench 23,839—

Reasoning Claude Sonnet 4.5 leads

Claude Sonnet 4.5: 26.9 (#113), o4-mini: 24.6 (#143)

BenchmarkClaude Sonnet 4.5o4-mini
ARC-AGI-213.6%6.1%
SimpleBench54.3%38.7%
Kagi LLM Benchmark57.9%67.6%
ARC-AGI-163.7%58.7%
CritPt1.1%0.6%
Chess Puzzles12%26%
EnigmaEval6%9.2%
LMArena Hard Prompts14621351
Mystery Game Puzzles17%5%
DTBench83.2%77.6%
LMCA38.8%26.5%
Epoch Capabilities Index146.84145.63
ForecastBench61.961.8
NYT Connections (extended)37.3%—
EBR-Bench2.4%—

Math o4-mini leads

Claude Sonnet 4.5: 31.9 (#190), o4-mini: 40.2 (#79)

BenchmarkClaude Sonnet 4.5o4-mini
FrontierMath (Tiers 1-3)23.9%36.1%
FrontierMath Tier 42.4%4.9%
OTIS Mock AIME 2024-202577.8%81.7%
Omni-MATH55.3%72%
LMArena Math14481390
MATH Level 597.7%97.8%
FrontierMath (Feb 2025 set)15.2%24.8%
FrontierMath Tier 4 (v1)4.2%6.3%
ProofBench19%—

Knowledge Claude Sonnet 4.5 leads

Claude Sonnet 4.5: 48.4 (#70), o4-mini: 43.5 (#83)

BenchmarkClaude Sonnet 4.5o4-mini
GPQA Diamond82.3%79.6%
Humanity's Last Exam13.7%18.1%
SimpleQA Verified30.7%19.6%
MMLU-Pro86.9%82%
Vectara Hallucination Rate12%18.6%
GPQA (HELM)68.6%73.5%
LMArena Expert14831344
Confabulations—15.8%

Multimodal o4-mini leads

Claude Sonnet 4.5: 34.1 (#84), o4-mini: 39.5 (#46)

BenchmarkClaude Sonnet 4.5o4-mini
VPCT39.8%57.5%
LMArena Vision—1194
GeoBench—64%
LMArena Document1450—

Multilingual Claude Sonnet 4.5 leads

Claude Sonnet 4.5: 53.6 (#65), o4-mini: 47.2 (#149)

BenchmarkClaude Sonnet 4.5o4-mini
LMArena Non-English14251336
LMArena Chinese14591355
LMArena French14591362
LMArena German14271336
LMArena Japanese13901308
LMArena Korean14031313
LMArena Russian14361334
LMArena Spanish14571346

Instruction Following Too close to call

Claude Sonnet 4.5: 75.2 (#74), o4-mini: 75.4 (#63)

BenchmarkClaude Sonnet 4.5o4-mini
IFEval85%92.8%
LMArena Instruction Following14591321

Long Context Too close to call

Claude Sonnet 4.5: 45.2 (#45), o4-mini: 45.5 (#31)

BenchmarkClaude Sonnet 4.5o4-mini
LMArena Longer Query14761315
Fiction.LiveBench—77.8%

Writing & Preference Claude Sonnet 4.5 leads

Claude Sonnet 4.5: 66.7 (#33), o4-mini: 54.2 (#148)

BenchmarkClaude Sonnet 4.5o4-mini
LMArena Text14391353
LMArena Creative Writing14421294
WildBench85.4%85.4%
LMArena Multi-Turn14651350
Short-Story Creative Writing—75%
EQ-Bench Creative Writing1678—

Frequently asked questions

Is Claude Sonnet 4.5 better than o4-mini?

Claude Sonnet 4.5 is the stronger model overall, scoring 44.0 to 41.6 on the Noometry Index. o4-mini costs 3.1× less per token, which makes it the better buy when Claude Sonnet 4.5's lead doesn't matter for your workload.

Which is cheaper, Claude Sonnet 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 Sonnet 4.5 lists at $3 and $15.

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

Claude Sonnet 4.5 scores higher on coding benchmarks: 47.8 versus 41.6 in the Noometry coding category.

Which has the bigger context window?

Claude Sonnet 4.5 does, with 1M tokens against 200K.

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

53 benchmarks have published results for both models. Claude Sonnet 4.5 has 73 scored results on Noometry and o4-mini has 60.

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