Noometry

Model comparison

Claude Haiku 4.5 vs Mercury

Claude Haiku 4.5 is the stronger model overall, scoring 39.5 to 37.6 on the Noometry Index.

Last verified . 8 shared benchmarks.

Claude Haiku 4.5 Anthropic

39.5

Rank #165 Confirmed

Mercury Inception

37.6

Rank #199 Confirmed

Summary

  • They share 8 benchmarks with published results for both. Claude Haiku 4.5 scores higher in 5 categories and Mercury in 1 category; 6 gaps are clear of the uncertainty.
  • The widest gap is in writing & preference, where Claude Haiku 4.5 leads 57.9 to 46.2.

Side by side

Claude Haiku 4.5Mercury
ProviderAnthropicInception
Noometry Index39.537.6
Released2025-10-15—
WeightsProprietaryProprietary
Context window200K—
Max output64K—
Input $ / M tokens$1—
Output $ / M tokens$5—
Results tracked539

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Category by category

Coding Claude Haiku 4.5 leads

Claude Haiku 4.5: 44.0 (#78), Mercury: 38.7 (#170)

BenchmarkClaude Haiku 4.5Mercury
LMArena Coding14531322
SWE-bench Verified (bash only)66.6%—
LMArena WebDev1330—
SWE-bench Multilingual64.7%—
SciCode43.3%—
WeirdML45.4%—
ALE-Bench653.48—

Agentic & Tool Use Not comparable

Claude Haiku 4.5: 33.6 (#52), Mercury: —

BenchmarkClaude Haiku 4.5Mercury
Terminal-Bench35.5%—
Berkeley Function Calling Leaderboard68.7%—
DeepResearch Bench45.5%—
BALROG31.2%—
ExploitBench13.7%—
Vending-Bench 2458.89—

Reasoning Mercury leads

Claude Haiku 4.5: 15.1 (#320), Mercury: 17.5 (#293)

BenchmarkClaude Haiku 4.5Mercury
LMArena Hard Prompts14201285
ARC-AGI-24%—
Kagi LLM Benchmark—21.6%
NYT Connections (extended)14.3%—
ARC-AGI-147.7%—
CritPt0%—
Chess Puzzles8%—
DTBench73.6%—
LMCA30.9%—
Epoch Capabilities Index142.41—
ForecastBench61.4—

Math Not comparable

Claude Haiku 4.5: 44.9 (#78), Mercury: —

BenchmarkClaude Haiku 4.5Mercury
OTIS Mock AIME 2024-202566.7%—
Omni-MATH56.1%—
LMArena Math1396—
MATH Level 596.4%—
FrontierMath (Feb 2025 set)5.9%—
FrontierMath Tier 4 (v1)2.1%—

Knowledge Not comparable

Claude Haiku 4.5: 37.7 (#153), Mercury: —

BenchmarkClaude Haiku 4.5Mercury
GPQA Diamond71.2%—
SimpleQA Verified13.2%—
MMLU-Pro77.7%—
Vectara Hallucination Rate9.8%—
GPQA (HELM)60.5%—
LMArena Expert1442—

Multimodal Not comparable

Claude Haiku 4.5: 26.8 (#118), Mercury: —

BenchmarkClaude Haiku 4.5Mercury
Blueprint-Bench 20%—
LMArena Document1420—

Multilingual Claude Haiku 4.5 leads

Claude Haiku 4.5: 49.9 (#129), Mercury: 41.6 (#206)

BenchmarkClaude Haiku 4.5Mercury
LMArena Non-English13771260
LMArena Chinese1417—
LMArena French1408—
LMArena German1375—
LMArena Japanese1339—
LMArena Korean1347—
LMArena Russian1381—
LMArena Spanish1420—

Instruction Following Claude Haiku 4.5 leads

Claude Haiku 4.5: 71.4 (#149), Mercury: 65.2 (#224)

BenchmarkClaude Haiku 4.5Mercury
LMArena Instruction Following14141239
IFEval80.1%—

Long Context Claude Haiku 4.5 leads

Claude Haiku 4.5: 43.6 (#92), Mercury: 38.4 (#198)

BenchmarkClaude Haiku 4.5Mercury
LMArena Longer Query14271266

Writing & Preference Claude Haiku 4.5 leads

Claude Haiku 4.5: 57.9 (#123), Mercury: 46.2 (#221)

BenchmarkClaude Haiku 4.5Mercury
LMArena Text13961282
LMArena Creative Writing13721191
LMArena Multi-Turn14091282
WildBench83.9%—
EQ-Bench 41064—

Frequently asked questions

Is Claude Haiku 4.5 better than Mercury?

Claude Haiku 4.5 is the stronger model overall, scoring 39.5 to 37.6 on the Noometry Index.

Is Claude Haiku 4.5 or Mercury better for coding?

Claude Haiku 4.5 scores higher on coding benchmarks: 44.0 versus 38.7 in the Noometry coding category.

How many benchmarks do Claude Haiku 4.5 and Mercury share?

8 benchmarks have published results for both models. Claude Haiku 4.5 has 53 scored results on Noometry and Mercury has 9.

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