Noometry

Model comparison

Claude Opus 5 vs Qwen3.8 Flash

Claude Opus 5 has enough public results to be ranked (#4); Qwen3.8 Flash does not yet, so treat this comparison as directional.

Last verified . 1 shared benchmarks.

Claude Opus 5 Anthropic

67.8

Rank #4 Confirmed

Qwen3.8 Flash Alibaba (Qwen)

35.5

Unranked Sparse

Summary

  • They share 1 benchmark with published results for both. Claude Opus 5 scores higher in 1 category and Qwen3.8 Flash in 0 categories; one gap is clear of the uncertainty.
  • The widest gap is in agentic & tool use, where Claude Opus 5 leads 55.6 to 31.3.
  • The biggest single-benchmark swing is GDP.pdf: 24% for Claude Opus 5 and 16.6% for Qwen3.8 Flash.
  • Qwen3.8 Flash is cheaper at $0.15 / $0.47 per million input/output tokens, against $5 / $25 for Claude Opus 5.

Side by side

Claude Opus 5Qwen3.8 Flash
ProviderAnthropicAlibaba (Qwen)
Noometry Index67.835.5
Released2026-07-242026-08-26
WeightsProprietaryProprietary
Context window1M1M
Max output128K131K
Input $ / M tokens$5$0.15
Output $ / M tokens$25$0.47
Results tracked571

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Category by category

Coding Not comparable

Claude Opus 5: 67.5 (#5), Qwen3.8 Flash: —

BenchmarkClaude Opus 5Qwen3.8 Flash
DeepSWE73.6%—
FrontierCode53.4%—
CursorBench46.6%—
LMArena WebDev1691—
FrontierSWE52%—
SciCode56.4%—
WeirdML91.8%—
LMArena Coding1534—
ALE-Bench2,165—

Agentic & Tool Use Claude Opus 5 leads

Claude Opus 5: 55.6 (#1), Qwen3.8 Flash: 31.3

BenchmarkClaude Opus 5Qwen3.8 Flash
GDP.pdf24%16.6%
APEX-Agents65.8%—
OSWorld 2.031.4%—
τ²-bench Banking48.7%—
PostTrainBench35%—
BALROG63.4%—
GBAEval79.6%—
Vending-Bench 211,182—

Reasoning Not comparable

Claude Opus 5: 77.2 (#4), Qwen3.8 Flash: —

BenchmarkClaude Opus 5Qwen3.8 Flash
ARC-AGI-290.4%—
SimpleBench80.6%—
NYT Connections (extended)94.3%—
ARC-AGI-197.5%—
CritPt29.1%—
Chess Puzzles42%—
EBR-Bench45.7%—
LMArena Hard Prompts1526—
Mystery Game Puzzles59%—
DTBench97.9%—
LMCA64.5%—
Bench to the Future 30.12—
Epoch Capabilities Index162.78—

Math Not comparable

Claude Opus 5: 86.2 (#8), Qwen3.8 Flash: —

BenchmarkClaude Opus 5Qwen3.8 Flash
FrontierMath (Tiers 1-3)85.6%—
FrontierMath Tier 473.2%—
OTIS Mock AIME 2024-202598.9%—
ProofBench99%—
LMArena Math1531—

Knowledge Not comparable

Claude Opus 5: 66.8 (#9), Qwen3.8 Flash: —

BenchmarkClaude Opus 5Qwen3.8 Flash
GPQA Diamond93.9%—
SimpleQA Verified59.9%—
LMArena Expert1557—

Multimodal Not comparable

Claude Opus 5: 50.8 (#8), Qwen3.8 Flash: —

BenchmarkClaude Opus 5Qwen3.8 Flash
LMArena Vision1319—
Blueprint-Bench 230.4%—
Furniture Assembly60.8%—
LMArena Document1516—

Multilingual Not comparable

Claude Opus 5: 58.8 (#4), Qwen3.8 Flash: —

BenchmarkClaude Opus 5Qwen3.8 Flash
LMArena Non-English1501—
LMArena Chinese1574—
LMArena French1519—
LMArena German1524—
LMArena Japanese1516—
LMArena Korean1521—
LMArena Russian1507—
LMArena Spanish1519—

Instruction Following Not comparable

Claude Opus 5: 79.2 (#7), Qwen3.8 Flash: —

BenchmarkClaude Opus 5Qwen3.8 Flash
LMArena Instruction Following1517—

Long Context Not comparable

Claude Opus 5: 46.5 (#21), Qwen3.8 Flash: —

BenchmarkClaude Opus 5Qwen3.8 Flash
LMArena Longer Query1515—

Writing & Preference Not comparable

Claude Opus 5: 79.2 (#1), Qwen3.8 Flash: —

BenchmarkClaude Opus 5Qwen3.8 Flash
LMArena Text1507—
LMArena Creative Writing1491—
EQ-Bench Creative Writing2133—
EQ-Bench 41385—
LMArena Multi-Turn1499—

Frequently asked questions

Is Claude Opus 5 better than Qwen3.8 Flash?

Claude Opus 5 has enough public results to be ranked (#4); Qwen3.8 Flash does not yet, so treat this comparison as directional.

Which is cheaper, Claude Opus 5 or Qwen3.8 Flash?

Qwen3.8 Flash is cheaper. It lists at $0.15 per million input tokens and $0.47 per million output tokens; Claude Opus 5 lists at $5 and $25.

Which has the bigger context window?

Both accept 1M tokens.

How many benchmarks do Claude Opus 5 and Qwen3.8 Flash share?

1 benchmark has published results for both models. Claude Opus 5 has 57 scored results on Noometry and Qwen3.8 Flash has 1.

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