Noometry

Model comparison

Claude Opus 5.5 vs ERNIE 5.1

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 43.8 on the Noometry Index.

Last verified . 15 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

ERNIE 5.1 Baidu

43.8

Rank #83 Confirmed

Summary

  • They share 15 benchmarks with published results for both. Claude Opus 5.5 scores higher in 8 categories and ERNIE 5.1 in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Opus 5.5 leads 80.2 to 21.9.
  • The biggest single-benchmark swing is NYT Connections (extended): 88.5% for Claude Opus 5.5 and 23.4% for ERNIE 5.1.

Side by side

Claude Opus 5.5ERNIE 5.1
ProviderAnthropicBaidu
Noometry Index68.643.8
Released2026-09-22—
WeightsProprietaryProprietary
Context window1M—
Max output128K—
Input $ / M tokens$4—
Output $ / M tokens$20—
Results tracked4419

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.9 (#3), ERNIE 5.1: 44.0 (#76)

BenchmarkClaude Opus 5.5ERNIE 5.1
LMArena Coding15471488
FrontierCode54.6%—
CursorBench57.8%—
LMArena WebDev1813—
FrontierSWE62.3%—
SciCode66.9%—
MirrorCode77.4%—
ALE-Bench2,147—

Agentic & Tool Use Not comparable

Claude Opus 5.5: 45.3 (#15), ERNIE 5.1: —

BenchmarkClaude Opus 5.5ERNIE 5.1
APEX-Agents73.5%—
GDP.pdf30.6%—
LMArena Search—1227
Vending-Bench 29,235—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 80.2 (#3), ERNIE 5.1: 21.9 (#211)

BenchmarkClaude Opus 5.5ERNIE 5.1
NYT Connections (extended)88.5%23.4%
LMArena Hard Prompts15351481
ARC-AGI-293.3%—
ARC-AGI-198.5%—
CritPt31.7%—
EBR-Bench71.4%—
Mystery Game Puzzles71%—
DTBench98.9%—
LMCA68.2%—
Epoch Capabilities Index167.33—

Math Claude Opus 5.5 leads

Claude Opus 5.5: 91.8 (#3), ERNIE 5.1: 40.3 (#92)

BenchmarkClaude Opus 5.5ERNIE 5.1
LMArena Math15061481
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
FrontierMath Erdős2.9%—

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.4 (#10), ERNIE 5.1: 41.9 (#102)

BenchmarkClaude Opus 5.5ERNIE 5.1
LMArena Expert15471492
GPQA Diamond90.6%—
SimpleQA Verified72.2%—

Multimodal Not comparable

Claude Opus 5.5: 57.8 (#1), ERNIE 5.1: —

BenchmarkClaude Opus 5.5ERNIE 5.1
LMArena Vision1321—
Blueprint-Bench 251.2%—
Furniture Assembly83.3%—

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.1 (#2), ERNIE 5.1: 55.5 (#29)

BenchmarkClaude Opus 5.5ERNIE 5.1
LMArena Non-English15071454
LMArena Chinese15881508
LMArena French15141488
LMArena Russian15201459
LMArena Spanish15071473
LMArena German—1470
LMArena Japanese—1422
LMArena Korean—1427

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.0 (#3), ERNIE 5.1: 76.7 (#37)

BenchmarkClaude Opus 5.5ERNIE 5.1
LMArena Instruction Following15371460

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.1 (#19), ERNIE 5.1: 44.7 (#59)

BenchmarkClaude Opus 5.5ERNIE 5.1
LMArena Longer Query15321462

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.2 (#3), ERNIE 5.1: 65.1 (#52)

BenchmarkClaude Opus 5.5ERNIE 5.1
LMArena Text15151468
LMArena Creative Writing15331441
LMArena Multi-Turn14991471
EQ-Bench Creative Writing2050—

Frequently asked questions

Is Claude Opus 5.5 better than ERNIE 5.1?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 43.8 on the Noometry Index.

Is Claude Opus 5.5 or ERNIE 5.1 better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 44.0 in the Noometry coding category.

How many benchmarks do Claude Opus 5.5 and ERNIE 5.1 share?

15 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and ERNIE 5.1 has 19.

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