Noometry

Model comparison

Claude 3.5 Haiku vs Mercury 2.5

Mercury 2.5 is the stronger model overall, scoring 33.5 to 29.2 on the Noometry Index.

Last verified . 2 shared benchmarks.

Claude 3.5 Haiku Anthropic

29.2

Rank #315 Confirmed

Mercury 2.5 Inception

33.5

Rank #242 Reported

Summary

  • They share 2 benchmarks with published results for both. Claude 3.5 Haiku scores higher in 0 categories and Mercury 2.5 in 3 categories; 3 gaps are clear of the uncertainty.
  • The widest gap is in math, where Mercury 2.5 leads 23.3 to 14.7.
  • The biggest single-benchmark swing is SciCode: 27.4% for Claude 3.5 Haiku and 38.5% for Mercury 2.5.

Side by side

Claude 3.5 HaikuMercury 2.5
ProviderAnthropicInception
Noometry Index29.233.5
Released2024-10-222026-09-08
WeightsProprietaryProprietary
Context window—260K
Max output—66K
Input $ / M tokens—$0.04
Output $ / M tokens—$0.15
Results tracked494

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Category by category

Coding Mercury 2.5 leads

Claude 3.5 Haiku: 32.9 (#265), Mercury 2.5: 39.5 (#156)

BenchmarkClaude 3.5 HaikuMercury 2.5
SciCode27.4%38.5%
Aider Polyglot28%—
WeirdML30.7%—
BigCodeBench Instruct46.1%—
LiveBench Coding51.4%—
LMArena Coding1286—
BigCodeBench Complete59%—
CadEval32%—
ALE-Bench—301.65

Agentic & Tool Use Not comparable

Claude 3.5 Haiku: 28.0 (#95), Mercury 2.5: —

BenchmarkClaude 3.5 HaikuMercury 2.5
BALROG19.3%—

Reasoning Mercury 2.5 leads

Claude 3.5 Haiku: 17.7 (#290), Mercury 2.5: 22.4 (#193)

BenchmarkClaude 3.5 HaikuMercury 2.5
CritPt0%0%
LiveBench Reasoning28.1%—
LMArena Hard Prompts1251—
DTBench56.7%—
LiveBench Data Analysis48.5%—
Epoch Capabilities Index127.15—
LiveBench43.5%—

Math Mercury 2.5 leads

Claude 3.5 Haiku: 14.7 (#300), Mercury 2.5: 23.3 (#272)

BenchmarkClaude 3.5 HaikuMercury 2.5
OTIS Mock AIME 2024-20254.3%—
ProofBench—3%
Omni-MATH22.4%—
LiveBench Math35.5%—
LMArena Math1244—
MATH Level 546.4%—
FrontierMath (Feb 2025 set)0.3%—

Knowledge Not comparable

Claude 3.5 Haiku: 18.7 (#281), Mercury 2.5: —

BenchmarkClaude 3.5 HaikuMercury 2.5
GPQA Diamond38.1%—
MMLU-Pro60.5%—
Confabulations36.7%—
GPQA (HELM)36.3%—
LMArena Expert1208—
MMLU74.3%—

Multimodal Not comparable

Claude 3.5 Haiku: 26.8 (#117), Mercury 2.5: —

BenchmarkClaude 3.5 HaikuMercury 2.5
LMArena Vision1092—
GeoBench34%—

Multilingual Not comparable

Claude 3.5 Haiku: 40.0 (#218), Mercury 2.5: —

BenchmarkClaude 3.5 HaikuMercury 2.5
LMArena Non-English1238—
LMArena Chinese1229—
LMArena French1264—
LMArena German1237—
LMArena Japanese1175—
LMArena Korean1173—
LMArena Russian1253—
LMArena Spanish1261—

Instruction Following Not comparable

Claude 3.5 Haiku: 62.9 (#234), Mercury 2.5: —

BenchmarkClaude 3.5 HaikuMercury 2.5
LiveBench Instruction Following61.9%—
IFEval79.2%—
LMArena Instruction Following1241—

Long Context Not comparable

Claude 3.5 Haiku: 38.3 (#200), Mercury 2.5: —

BenchmarkClaude 3.5 HaikuMercury 2.5
LMArena Longer Query1261—

Writing & Preference Not comparable

Claude 3.5 Haiku: 42.7 (#234), Mercury 2.5: —

BenchmarkClaude 3.5 HaikuMercury 2.5
LMArena Text1255—
LMArena Creative Writing1233—
Short-Story Creative Writing73.5%—
EQ-Bench Creative Writing1146—
WildBench76%—
LMArena Multi-Turn1265—
LiveBench Language35.4%—

Frequently asked questions

Is Claude 3.5 Haiku better than Mercury 2.5?

Mercury 2.5 is the stronger model overall, scoring 33.5 to 29.2 on the Noometry Index.

Is Claude 3.5 Haiku or Mercury 2.5 better for coding?

Mercury 2.5 scores higher on coding benchmarks: 39.5 versus 32.9 in the Noometry coding category.

How many benchmarks do Claude 3.5 Haiku and Mercury 2.5 share?

2 benchmarks have published results for both models. Claude 3.5 Haiku has 49 scored results on Noometry and Mercury 2.5 has 4.

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