Noometry

Model comparison

Claude Sonnet 5 vs Mercury

Claude Sonnet 5 is the stronger model overall, scoring 54.5 to 37.3 on the Noometry Index.

Last verified . 8 shared benchmarks.

Claude Sonnet 5 Anthropic

54.5

Rank #26 Confirmed

Mercury Inception

37.3

Rank #192 Confirmed

Summary

  • They share 8 benchmarks with published results for both. Claude Sonnet 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 Sonnet 5 leads 48.2 to 16.8.

Side by side

Claude Sonnet 5Mercury
ProviderAnthropicInception
Noometry Index54.537.3
Released2026-06-29—
WeightsProprietaryProprietary
Context window1M—
Max output128K—
Input $ / M tokens$2—
Output $ / M tokens$10—
Results tracked519

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

Category by category

Coding Claude Sonnet 5 leads

Claude Sonnet 5: 55.5 (#20), Mercury: 38.1 (#164)

BenchmarkClaude Sonnet 5Mercury
LMArena Coding14831323
DeepSWE53.8%—
FrontierCode42.7%—
CursorBench34.1%—
LMArena WebDev1540—
SciCode53.6%—
GSO37.3%—
WeirdML68.8%—
ALE-Bench1,463—

Agentic & Tool Use Not comparable

Claude Sonnet 5: 42.7 (#16), Mercury: —

BenchmarkClaude Sonnet 5Mercury
APEX-Agents54.5%—
GBAEval65.3%—
LMArena Search1194—
Vending-Bench 26,378—

Reasoning Claude Sonnet 5 leads

Claude Sonnet 5: 48.2 (#37), Mercury: 16.8 (#288)

BenchmarkClaude Sonnet 5Mercury
LMArena Hard Prompts14611284
SimpleBench60.6%—
Kagi LLM Benchmark—21.6%
NYT Connections (extended)75.1%—
CritPt16.9%—
Chess Puzzles35%—
Mystery Game Puzzles35%—
DTBench92.5%—
LMCA50%—
Surface Evolver Bench60%—
Bench to the Future 30.14—
Epoch Capabilities Index156.34—
ForecastBench61.1—

Math Not comparable

Claude Sonnet 5: 66.1 (#21), Mercury: —

BenchmarkClaude Sonnet 5Mercury
FrontierMath (Tiers 1-3)65.6%—
FrontierMath Tier 429.3%—
OTIS Mock AIME 2024-202594.7%—
ProofBench77%—
LMArena Math1467—

Knowledge Not comparable

Claude Sonnet 5: 55.7 (#42), Mercury: —

BenchmarkClaude Sonnet 5Mercury
GPQA Diamond90.5%—
SimpleQA Verified33.7%—
LMArena Expert1491—

Multimodal Not comparable

Claude Sonnet 5: 42.4 (#26), Mercury: —

BenchmarkClaude Sonnet 5Mercury
LMArena Vision1275—
Blueprint-Bench 224.9%—
LMArena Document1466—

Multilingual Claude Sonnet 5 leads

Claude Sonnet 5: 54.0 (#55), Mercury: 41.7 (#201)

BenchmarkClaude Sonnet 5Mercury
LMArena Non-English14311259
LMArena Chinese1475—
LMArena French1457—
LMArena German1448—
LMArena Japanese1422—
LMArena Korean1411—
LMArena Russian1452—
LMArena Spanish1436—

Instruction Following Claude Sonnet 5 leads

Claude Sonnet 5: 76.6 (#39), Mercury: 65.3 (#220)

BenchmarkClaude Sonnet 5Mercury
LMArena Instruction Following14531238

Long Context Claude Sonnet 5 leads

Claude Sonnet 5: 44.8 (#53), Mercury: 38.3 (#193)

BenchmarkClaude Sonnet 5Mercury
LMArena Longer Query14641264

Writing & Preference Claude Sonnet 5 leads

Claude Sonnet 5: 69.4 (#24), Mercury: 46.2 (#216)

BenchmarkClaude Sonnet 5Mercury
LMArena Text14431282
LMArena Creative Writing14161186
LMArena Multi-Turn14541283
EQ-Bench Creative Writing1794—
EQ-Bench 41236—

Frequently asked questions

Is Claude Sonnet 5 better than Mercury?

Claude Sonnet 5 is the stronger model overall, scoring 54.5 to 37.3 on the Noometry Index.

Is Claude Sonnet 5 or Mercury better for coding?

Claude Sonnet 5 scores higher on coding benchmarks: 55.5 versus 38.1 in the Noometry coding category.

How many benchmarks do Claude Sonnet 5 and Mercury share?

8 benchmarks have published results for both models. Claude Sonnet 5 has 51 scored results on Noometry and Mercury has 9.

Related comparisons

Go deeper