Noometry

Model comparison

Claude Sonnet 5 vs Mercury

Claude Sonnet 5 is the stronger model overall, scoring 54.6 to 37.6 on the Noometry Index.

Last verified . 8 shared benchmarks.

Claude Sonnet 5 Anthropic

54.6

Rank #29 Confirmed

Mercury Inception

37.6

Rank #199 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 49.1 to 17.5.

Side by side

Claude Sonnet 5Mercury
ProviderAnthropicInception
Noometry Index54.637.6
Released2026-06-29—
WeightsProprietaryProprietary
Context window1M—
Max output128K—
Input $ / M tokens$2—
Output $ / M tokens$10—
Results tracked519

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Category by category

Coding Claude Sonnet 5 leads

Claude Sonnet 5: 55.5 (#26), Mercury: 38.7 (#170)

BenchmarkClaude Sonnet 5Mercury
LMArena Coding14831322
DeepSWE53.8%—
FrontierCode42.7%—
CursorBench34.1%—
LMArena WebDev1541—
SciCode54.3%—
GSO37.3%—
WeirdML68.8%—
ALE-Bench1,463—

Agentic & Tool Use Not comparable

Claude Sonnet 5: 42.8 (#18), Mercury: —

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

Reasoning Claude Sonnet 5 leads

Claude Sonnet 5: 49.1 (#39), Mercury: 17.5 (#293)

BenchmarkClaude Sonnet 5Mercury
LMArena Hard Prompts14611285
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 Index156.21—
ForecastBench61.1—

Math Not comparable

Claude Sonnet 5: 66.2 (#27), 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: 55.6 (#47), Mercury: —

BenchmarkClaude Sonnet 5Mercury
GPQA Diamond90.5%—
SimpleQA Verified33.7%—
LMArena Expert1490—

Multimodal Not comparable

Claude Sonnet 5: 42.4 (#31), Mercury: —

BenchmarkClaude Sonnet 5Mercury
LMArena Vision1274—
Blueprint-Bench 224.9%—
LMArena Document1466—

Multilingual Claude Sonnet 5 leads

Claude Sonnet 5: 53.8 (#55), Mercury: 41.6 (#206)

BenchmarkClaude Sonnet 5Mercury
LMArena Non-English14311260
LMArena Chinese1477—
LMArena French1460—
LMArena German1440—
LMArena Japanese1422—
LMArena Korean1411—
LMArena Russian1451—
LMArena Spanish1437—

Instruction Following Claude Sonnet 5 leads

Claude Sonnet 5: 76.3 (#41), Mercury: 65.2 (#224)

BenchmarkClaude Sonnet 5Mercury
LMArena Instruction Following14521239

Long Context Claude Sonnet 5 leads

Claude Sonnet 5: 44.8 (#55), Mercury: 38.4 (#198)

BenchmarkClaude Sonnet 5Mercury
LMArena Longer Query14631266

Writing & Preference Claude Sonnet 5 leads

Claude Sonnet 5: 69.2 (#25), Mercury: 46.2 (#221)

BenchmarkClaude Sonnet 5Mercury
LMArena Text14421282
LMArena Creative Writing14161191
LMArena Multi-Turn14541282
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 54.6 to 37.6 on the Noometry Index.

Is Claude Sonnet 5 or Mercury better for coding?

Claude Sonnet 5 scores higher on coding benchmarks: 55.5 versus 38.7 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.

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