Noometry

Model comparison

Claude Opus 4 vs Mercury 2.5

Claude Opus 4 has enough public results to be ranked (#93); Mercury 2.5 does not yet, so treat this comparison as directional.

Last verified . 0 shared benchmarks.

Claude Opus 4 Anthropic

42.9

Rank #93 Confirmed

Mercury 2.5 Inception

30.2

Unranked Sparse

Summary

  • The widest gap is in math, where Claude Opus 4 leads 40.2 to 22.4.
  • Mercury 2.5 is cheaper at $0.04 / $0.15 per million input/output tokens, against $15 / $75 for Claude Opus 4.
  • Mercury 2.5 accepts more context: 260K tokens versus 200K.

Side by side

Claude Opus 4Mercury 2.5
ProviderAnthropicInception
Noometry Index42.930.2
Released2025-05-222026-09-08
WeightsProprietaryProprietary
Context window200K260K
Max output32K66K
Input $ / M tokens$15$0.04
Output $ / M tokens$75$0.15
Results tracked562

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Category by category

Coding Not comparable

Claude Opus 4: 47.8 (#55), Mercury 2.5: —

BenchmarkClaude Opus 4Mercury 2.5
SWE-bench Verified70.7%—
SWE-bench Verified (bash only)67.6%—
Aider Polyglot72%—
GSO6.9%—
WeirdML43.7%—
LMArena Coding1442—
ALE-Bench—301.65
AlgoTune1.33—

Agentic & Tool Use Not comparable

Claude Opus 4: 34.5 (#39), Mercury 2.5: —

BenchmarkClaude Opus 4Mercury 2.5
Cybench38%—
DeepResearch Bench46.8%—
LMArena Search1127—
METR Time Horizons63.9%—

Reasoning Not comparable

Claude Opus 4: 27.4 (#104), Mercury 2.5: —

BenchmarkClaude Opus 4Mercury 2.5
ARC-AGI-28.6%—
SimpleBench58.8%—
Kagi LLM Benchmark74.3%—
ARC-AGI-135.7%—
CritPt0.3%—
EnigmaEval5.6%—
LMArena Hard Prompts1399—
DTBench81.6%—
LMCA37.4%—
Epoch Capabilities Index142.67—
ForecastBench61.1—

Math Claude Opus 4 leads

Claude Opus 4: 40.2 (#80), Mercury 2.5: 22.4

BenchmarkClaude Opus 4Mercury 2.5
OTIS Mock AIME 2024-202564.4%—
ProofBench—3%
Omni-MATH61.6%—
LMArena Math1391—
MATH Level 585%—
FrontierMath (Feb 2025 set)4.5%—
FrontierMath Tier 4 (v1)4.2%—

Knowledge Not comparable

Claude Opus 4: 43.9 (#82), Mercury 2.5: —

BenchmarkClaude Opus 4Mercury 2.5
GPQA Diamond76.3%—
Humanity's Last Exam10.7%—
MMLU-Pro87.5%—
Confabulations15.9%—
Vectara Hallucination Rate12%—
GPQA (HELM)70.8%—
LMArena Expert1384—

Multimodal Not comparable

Claude Opus 4: 30.9 (#101), Mercury 2.5: —

BenchmarkClaude Opus 4Mercury 2.5
LMArena Vision1192—
GeoBench49%—
VPCT38%—

Multilingual Not comparable

Claude Opus 4: 49.0 (#133), Mercury 2.5: —

BenchmarkClaude Opus 4Mercury 2.5
LMArena Non-English1362—
LMArena Chinese1386—
LMArena French1370—
LMArena German1391—
LMArena Japanese1332—
LMArena Korean1318—
LMArena Russian1392—
LMArena Spanish1388—

Instruction Following Not comparable

Claude Opus 4: 77.3 (#26), Mercury 2.5: —

BenchmarkClaude Opus 4Mercury 2.5
IFEval91.8%—
LMArena Instruction Following1406—

Long Context Not comparable

Claude Opus 4: 39.5 (#167), Mercury 2.5: —

BenchmarkClaude Opus 4Mercury 2.5
Fiction.LiveBench61.1%—
LMArena Longer Query1422—

Writing & Preference Not comparable

Claude Opus 4: 61.4 (#85), Mercury 2.5: —

BenchmarkClaude Opus 4Mercury 2.5
LMArena Text1377—
LMArena Creative Writing1386—
Short-Story Creative Writing83.6%—
EQ-Bench Creative Writing1580—
WildBench85.2%—
LMArena Multi-Turn1396—

Frequently asked questions

Is Claude Opus 4 better than Mercury 2.5?

Claude Opus 4 has enough public results to be ranked (#93); Mercury 2.5 does not yet, so treat this comparison as directional.

Which is cheaper, Claude Opus 4 or Mercury 2.5?

Mercury 2.5 is cheaper. It lists at $0.04 per million input tokens and $0.15 per million output tokens; Claude Opus 4 lists at $15 and $75.

Which has the bigger context window?

Mercury 2.5 does, with 260K tokens against 200K.

How many benchmarks do Claude Opus 4 and Mercury 2.5 share?

0 benchmarks have published results for both models. Claude Opus 4 has 56 scored results on Noometry and Mercury 2.5 has 2.

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