Noometry

Model comparison

Claude Opus 5 vs Hermes 4 405B

Claude Opus 5 has enough public results to be ranked (#4); Hermes 4 405B does not yet, so treat this comparison as directional.

Last verified . 1 shared benchmarks.

Claude Opus 5 Anthropic

67.7

Rank #4 Confirmed

Hermes 4 405B Nous Research

37.1

Unranked Sparse

Summary

  • They share 1 benchmark with published results for both. Claude Opus 5 scores higher in 2 categories and Hermes 4 405B in 0 categories; 2 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Opus 5 leads 77.1 to 25.3.
  • Hermes 4 405B is cheaper at $1 / $3 per million input/output tokens, against $5 / $25 for Claude Opus 5.
  • Claude Opus 5 accepts more context: 1M tokens versus 131K.
  • Hermes 4 405B has downloadable open weights; the other is API-only.

Side by side

Claude Opus 5Hermes 4 405B
ProviderAnthropicNous Research
Noometry Index67.737.1
Released2026-07-24—
WeightsProprietaryOpen
Context window1M131K
Max output128K118K
Input $ / M tokens$5$1
Output $ / M tokens$25$3
Results tracked572

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Category by category

Coding Not comparable

Claude Opus 5: 67.0 (#5), Hermes 4 405B: —

BenchmarkClaude Opus 5Hermes 4 405B
DeepSWE73.6%—
FrontierCode53.4%—
CursorBench46.6%—
LMArena WebDev1694—
FrontierSWE52%—
SciCode56.4%—
WeirdML91.8%—
LMArena Coding1533—
ALE-Bench2,165—

Agentic & Tool Use Not comparable

Claude Opus 5: 55.5 (#1), Hermes 4 405B: —

BenchmarkClaude Opus 5Hermes 4 405B
APEX-Agents65.8%—
OSWorld 2.031.4%—
τ²-bench Banking48.7%—
PostTrainBench35%—
BALROG63.4%—
GBAEval79.6%—
GDP.pdf24%—
Vending-Bench 211,182—

Reasoning Claude Opus 5 leads

Claude Opus 5: 77.1 (#3), Hermes 4 405B: 25.3

BenchmarkClaude Opus 5Hermes 4 405B
ARC-AGI-290.4%—
SimpleBench80.6%—
Kagi LLM Benchmark—55.8%
NYT Connections (extended)94.3%—
ARC-AGI-197.5%—
CritPt29.1%—
Chess Puzzles42%—
EBR-Bench45.7%—
LMArena Hard Prompts1525—
Mystery Game Puzzles59%—
DTBench97.9%—
LMCA64.5%—
Bench to the Future 30.12—
Epoch Capabilities Index162.67—

Math Not comparable

Claude Opus 5: 86.1 (#6), Hermes 4 405B: —

BenchmarkClaude Opus 5Hermes 4 405B
FrontierMath (Tiers 1-3)85.6%—
FrontierMath Tier 473.2%—
OTIS Mock AIME 2024-202598.9%—
ProofBench99%—
LMArena Math1533—

Knowledge Not comparable

Claude Opus 5: 66.8 (#8), Hermes 4 405B: —

BenchmarkClaude Opus 5Hermes 4 405B
GPQA Diamond93.9%—
SimpleQA Verified59.9%—
LMArena Expert1558—

Multimodal Not comparable

Claude Opus 5: 51.1 (#6), Hermes 4 405B: —

BenchmarkClaude Opus 5Hermes 4 405B
LMArena Vision1321—
Blueprint-Bench 230.4%—
Furniture Assembly60.8%—
LMArena Document1516—

Multilingual Not comparable

Claude Opus 5: 58.8 (#3), Hermes 4 405B: —

BenchmarkClaude Opus 5Hermes 4 405B
LMArena Non-English1500—
LMArena Chinese1575—
LMArena French1522—
LMArena German1522—
LMArena Japanese1510—
LMArena Korean1526—
LMArena Russian1507—
LMArena Spanish1519—

Instruction Following Not comparable

Claude Opus 5: 79.3 (#5), Hermes 4 405B: —

BenchmarkClaude Opus 5Hermes 4 405B
LMArena Instruction Following1516—

Long Context Not comparable

Claude Opus 5: 46.5 (#20), Hermes 4 405B: —

BenchmarkClaude Opus 5Hermes 4 405B
LMArena Longer Query1516—

Writing & Preference Claude Opus 5 leads

Claude Opus 5: 79.3 (#2), Hermes 4 405B: 53.0

BenchmarkClaude Opus 5Hermes 4 405B
EQ-Bench Creative Writing21331421
LMArena Text1506—
LMArena Creative Writing1491—
EQ-Bench 41385—
LMArena Multi-Turn1496—

Frequently asked questions

Is Claude Opus 5 better than Hermes 4 405B?

Claude Opus 5 has enough public results to be ranked (#4); Hermes 4 405B does not yet, so treat this comparison as directional.

Which is cheaper, Claude Opus 5 or Hermes 4 405B?

Hermes 4 405B is cheaper. It lists at $1 per million input tokens and $3 per million output tokens; Claude Opus 5 lists at $5 and $25.

Which has the bigger context window?

Claude Opus 5 does, with 1M tokens against 131K.

How many benchmarks do Claude Opus 5 and Hermes 4 405B share?

1 benchmark has published results for both models. Claude Opus 5 has 57 scored results on Noometry and Hermes 4 405B has 2.

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