Noometry

Model comparison

Mercury vs o3

o3 is the stronger model overall, scoring 47.5 to 37.6 on the Noometry Index.

Last verified . 9 shared benchmarks.

Mercury Inception

37.6

Rank #199 Confirmed

o3 OpenAI

47.5

Rank #61 Confirmed

Summary

  • They share 9 benchmarks with published results for both. Mercury scores higher in 0 categories and o3 in 6 categories; 6 gaps are clear of the uncertainty.
  • The widest gap is in writing & preference, where o3 leads 63.5 to 46.2.
  • The biggest single-benchmark swing is Kagi LLM Benchmark: 21.6% for Mercury and 67.6% for o3.

Side by side

Mercuryo3
ProviderInceptionOpenAI
Noometry Index37.647.5
Released—2025-04-16
WeightsProprietaryProprietary
Context window—200K
Max output—100K
Input $ / M tokens—$2
Output $ / M tokens—$8
Results tracked963

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Category by category

Coding o3 leads

Mercury: 38.7 (#170), o3: 46.8 (#64)

BenchmarkMercuryo3
LMArena Coding13221408
SWE-bench Verified—62.3%
SWE-bench Verified (bash only)—58.4%
Aider Polyglot—81.3%
GSO—8.8%
WeirdML—52.4%
CadEval—74%
ALE-Bench—933.55

Agentic & Tool Use Not comparable

Mercury: —, o3: 34.5 (#44)

BenchmarkMercuryo3
Berkeley Function Calling Leaderboard—63%
GDPval—30.8%
DeepResearch Bench—45.2%
OSWorld—23%
LMArena Search—1144
METR Time Horizons—65.4%

Reasoning o3 leads

Mercury: 17.5 (#293), o3: 32.0 (#78)

BenchmarkMercuryo3
Kagi LLM Benchmark21.6%67.6%
LMArena Hard Prompts12851402
ARC-AGI-2—6.5%
SimpleBench—53.1%
ARC-AGI-1—60.8%
CritPt—1.4%
Chess Puzzles—38%
EnigmaEval—13.1%
Mystery Game Puzzles—29%
DTBench—84.8%
LMCA—39.7%
Epoch Capabilities Index—146.86
ForecastBench—62.5

Math Not comparable

Mercury: —, o3: 50.2 (#58)

BenchmarkMercuryo3
FrontierMath (Tiers 1-3)—33.3%
OTIS Mock AIME 2024-2025—84.4%
Omni-MATH—71.4%
LMArena Math—1426
MATH Level 5—97.8%
FrontierMath (Feb 2025 set)—18.7%
FrontierMath Tier 4 (v1)—2.1%

Knowledge Not comparable

Mercury: —, o3: 54.6 (#52)

BenchmarkMercuryo3
GPQA Diamond—81.8%
Humanity's Last Exam—20.3%
SimpleQA Verified—49.4%
MMLU-Pro—85.9%
Confabulations—14.4%
GPQA (HELM)—75.3%
LMArena Expert—1402

Multimodal Not comparable

Mercury: —, o3: 41.4 (#36)

BenchmarkMercuryo3
LMArena Vision—1214
GeoBench—74%
VPCT—52%

Multilingual o3 leads

Mercury: 41.6 (#206), o3: 51.7 (#105)

BenchmarkMercuryo3
LMArena Non-English12601401
LMArena Chinese—1437
LMArena French—1430
LMArena German—1420
LMArena Japanese—1403
LMArena Korean—1370
LMArena Russian—1406
LMArena Spanish—1395

Instruction Following o3 leads

Mercury: 65.2 (#224), o3: 72.8 (#127)

BenchmarkMercuryo3
LMArena Instruction Following12391368
IFEval—86.9%

Long Context o3 leads

Mercury: 38.4 (#198), o3: 53.3 (#6)

BenchmarkMercuryo3
LMArena Longer Query12661372
Fiction.LiveBench—88.9%
CL-bench—17.8%

Writing & Preference o3 leads

Mercury: 46.2 (#221), o3: 63.5 (#64)

BenchmarkMercuryo3
LMArena Text12821410
LMArena Creative Writing11911359
LMArena Multi-Turn12821405
Short-Story Creative Writing—83.9%
EQ-Bench Creative Writing—1676
WildBench—86.1%

Frequently asked questions

Is Mercury better than o3?

o3 is the stronger model overall, scoring 47.5 to 37.6 on the Noometry Index.

Is Mercury or o3 better for coding?

o3 scores higher on coding benchmarks: 46.8 versus 38.7 in the Noometry coding category.

How many benchmarks do Mercury and o3 share?

9 benchmarks have published results for both models. Mercury has 9 scored results on Noometry and o3 has 63.

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