Noometry

Model comparison

Claude Opus 5 vs Mercury

Claude Opus 5 is the stronger model overall, scoring 67.7 to 37.3 on the Noometry Index.

Last verified . 8 shared benchmarks.

Claude Opus 5 Anthropic

67.7

Rank #4 Confirmed

Mercury Inception

37.3

Rank #192 Confirmed

Summary

  • They share 8 benchmarks with published results for both. Claude Opus 5 scores higher in 6 categories and Mercury in 0 categories; 6 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Opus 5 leads 77.1 to 16.8.

Side by side

Claude Opus 5Mercury
ProviderAnthropicInception
Noometry Index67.737.3
Released2026-07-24—
WeightsProprietaryProprietary
Context window1M—
Max output128K—
Input $ / M tokens$5—
Output $ / M tokens$25—
Results tracked579

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Category by category

Coding Claude Opus 5 leads

Claude Opus 5: 67.0 (#5), Mercury: 38.1 (#164)

BenchmarkClaude Opus 5Mercury
LMArena Coding15331323
DeepSWE73.6%—
FrontierCode53.4%—
CursorBench46.6%—
LMArena WebDev1694—
FrontierSWE52%—
SciCode56.4%—
WeirdML91.8%—
ALE-Bench2,165—

Agentic & Tool Use Not comparable

Claude Opus 5: 55.5 (#1), Mercury: —

BenchmarkClaude Opus 5Mercury
APEX-Agents65.8%—
OSWorld 2.031.4%—
τ²-bench Banking48.7%—
PostTrainBench35%—
BALROG63.4%—
GBAEval79.6%—
GDP.pdf24%—
Vending-Bench 211,182—

Reasoning Claude Opus 5 leads

Claude Opus 5: 77.1 (#3), Mercury: 16.8 (#288)

BenchmarkClaude Opus 5Mercury
LMArena Hard Prompts15251284
ARC-AGI-290.4%—
SimpleBench80.6%—
Kagi LLM Benchmark—21.6%
NYT Connections (extended)94.3%—
ARC-AGI-197.5%—
CritPt29.1%—
Chess Puzzles42%—
EBR-Bench45.7%—
Mystery Game Puzzles59%—
DTBench97.9%—
LMCA64.5%—
Bench to the Future 30.12—
Epoch Capabilities Index162.67—

Math Not comparable

Claude Opus 5: 86.1 (#6), Mercury: —

BenchmarkClaude Opus 5Mercury
FrontierMath (Tiers 1-3)85.6%—
FrontierMath Tier 473.2%—
OTIS Mock AIME 2024-202598.9%—
ProofBench99%—
LMArena Math1533—

Knowledge Not comparable

Claude Opus 5: 66.8 (#8), Mercury: —

BenchmarkClaude Opus 5Mercury
GPQA Diamond93.9%—
SimpleQA Verified59.9%—
LMArena Expert1558—

Multimodal Not comparable

Claude Opus 5: 51.1 (#6), Mercury: —

BenchmarkClaude Opus 5Mercury
LMArena Vision1321—
Blueprint-Bench 230.4%—
Furniture Assembly60.8%—
LMArena Document1516—

Multilingual Claude Opus 5 leads

Claude Opus 5: 58.8 (#3), Mercury: 41.7 (#201)

BenchmarkClaude Opus 5Mercury
LMArena Non-English15001259
LMArena Chinese1575—
LMArena French1522—
LMArena German1522—
LMArena Japanese1510—
LMArena Korean1526—
LMArena Russian1507—
LMArena Spanish1519—

Instruction Following Claude Opus 5 leads

Claude Opus 5: 79.3 (#5), Mercury: 65.3 (#220)

BenchmarkClaude Opus 5Mercury
LMArena Instruction Following15161238

Long Context Claude Opus 5 leads

Claude Opus 5: 46.5 (#20), Mercury: 38.3 (#193)

BenchmarkClaude Opus 5Mercury
LMArena Longer Query15161264

Writing & Preference Claude Opus 5 leads

Claude Opus 5: 79.3 (#2), Mercury: 46.2 (#216)

BenchmarkClaude Opus 5Mercury
LMArena Text15061282
LMArena Creative Writing14911186
LMArena Multi-Turn14961283
EQ-Bench Creative Writing2133—
EQ-Bench 41385—

Frequently asked questions

Is Claude Opus 5 better than Mercury?

Claude Opus 5 is the stronger model overall, scoring 67.7 to 37.3 on the Noometry Index.

Is Claude Opus 5 or Mercury better for coding?

Claude Opus 5 scores higher on coding benchmarks: 67.0 versus 38.1 in the Noometry coding category.

How many benchmarks do Claude Opus 5 and Mercury share?

8 benchmarks have published results for both models. Claude Opus 5 has 57 scored results on Noometry and Mercury has 9.

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