Noometry

Model comparison

Claude Opus 5.5 vs Hy4 preview

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 45.3 on the Noometry Index. Hy4 preview costs 7.1× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Last verified . 3 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

Hy4 preview Tencent

45.3

Rank #73 Reported

Summary

  • They share 3 benchmarks with published results for both. Claude Opus 5.5 scores higher in 3 categories and Hy4 preview in 0 categories; 3 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Opus 5.5 leads 80.2 to 31.9.
  • The biggest single-benchmark swing is ProofBench: 100% for Claude Opus 5.5 and 75% for Hy4 preview.
  • Hy4 preview is cheaper at $0.75 / $2.25 per million input/output tokens, against $4 / $20 for Claude Opus 5.5.
  • Hy4 preview accepts more context: 1.05M tokens versus 1M.
  • Hy4 preview has downloadable open weights; the other is API-only.

Side by side

Claude Opus 5.5Hy4 preview
ProviderAnthropicTencent
Noometry Index68.645.3
Released2026-09-222026-08-28
WeightsProprietaryOpen
Context window1M1.05M
Max output128K64K
Input $ / M tokens$4$0.75
Output $ / M tokens$20$2.25
Results tracked443

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.9 (#3), Hy4 preview: 51.6 (#38)

BenchmarkClaude Opus 5.5Hy4 preview
LMArena WebDev18131632
FrontierCode54.6%—
CursorBench57.8%—
FrontierSWE62.3%—
SciCode66.9%—
LMArena Coding1547—
MirrorCode77.4%—
ALE-Bench2,147—

Agentic & Tool Use Not comparable

Claude Opus 5.5: 45.3 (#15), Hy4 preview: —

BenchmarkClaude Opus 5.5Hy4 preview
APEX-Agents73.5%—
GDP.pdf30.6%—
Vending-Bench 29,235—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 80.2 (#3), Hy4 preview: 31.9 (#79)

BenchmarkClaude Opus 5.5Hy4 preview
NYT Connections (extended)88.5%68.2%
ARC-AGI-293.3%—
ARC-AGI-198.5%—
CritPt31.7%—
EBR-Bench71.4%—
LMArena Hard Prompts1535—
Mystery Game Puzzles71%—
DTBench98.9%—
LMCA68.2%—
Epoch Capabilities Index167.33—

Math Claude Opus 5.5 leads

Claude Opus 5.5: 91.8 (#3), Hy4 preview: 55.7 (#42)

BenchmarkClaude Opus 5.5Hy4 preview
ProofBench100%75%
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
OTIS Mock AIME 2024-2025100%—
LMArena Math1506—
FrontierMath Erdős2.9%—

Knowledge Not comparable

Claude Opus 5.5: 66.4 (#10), Hy4 preview: —

BenchmarkClaude Opus 5.5Hy4 preview
GPQA Diamond90.6%—
SimpleQA Verified72.2%—
LMArena Expert1547—

Multimodal Not comparable

Claude Opus 5.5: 57.8 (#1), Hy4 preview: —

BenchmarkClaude Opus 5.5Hy4 preview
LMArena Vision1321—
Blueprint-Bench 251.2%—
Furniture Assembly83.3%—

Multilingual Not comparable

Claude Opus 5.5: 59.1 (#2), Hy4 preview: —

BenchmarkClaude Opus 5.5Hy4 preview
LMArena Non-English1507—
LMArena Chinese1588—
LMArena French1514—
LMArena Russian1520—
LMArena Spanish1507—

Instruction Following Not comparable

Claude Opus 5.5: 80.0 (#3), Hy4 preview: —

BenchmarkClaude Opus 5.5Hy4 preview
LMArena Instruction Following1537—

Long Context Not comparable

Claude Opus 5.5: 47.1 (#19), Hy4 preview: —

BenchmarkClaude Opus 5.5Hy4 preview
LMArena Longer Query1532—

Writing & Preference Not comparable

Claude Opus 5.5: 78.2 (#3), Hy4 preview: —

BenchmarkClaude Opus 5.5Hy4 preview
LMArena Text1515—
LMArena Creative Writing1533—
EQ-Bench Creative Writing2050—
LMArena Multi-Turn1499—

Frequently asked questions

Is Claude Opus 5.5 better than Hy4 preview?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 45.3 on the Noometry Index. Hy4 preview costs 7.1× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Which is cheaper, Claude Opus 5.5 or Hy4 preview?

Hy4 preview is cheaper. It lists at $0.75 per million input tokens and $2.25 per million output tokens; Claude Opus 5.5 lists at $4 and $20.

Is Claude Opus 5.5 or Hy4 preview better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 51.6 in the Noometry coding category.

Which has the bigger context window?

Hy4 preview does, with 1.05M tokens against 1M.

How many benchmarks do Claude Opus 5.5 and Hy4 preview share?

3 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and Hy4 preview has 3.

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