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Opus 5.5 benchmarks show mixed results: first in general, third in secure code

By PulseAugur Editorial · [1 sources] ·

Recent independent benchmarks for Anthropic's Opus 5.5 present conflicting results. One evaluation by Artificial Analysis places Opus 5.5 in first place overall, outperforming OpenAI's GPT-6 Astra and Anthropic's own Fable 5.1 on coding and knowledge tests. However, a separate benchmark from Endor Labs focusing on secure code generation ranks Opus 5.5 third, suggesting it may have memorized training data and struggles with functional correctness in real-world projects. The cost per task also varies, with Astra being cheaper than Opus 5.5 despite Opus 5.5's lower token cost. AI

IMPACT Mixed benchmark results for Opus 5.5 highlight the ongoing challenge of evaluating LLM capabilities, particularly in secure coding and potential data memorization.

RANK_REASON Independent benchmark results for a specific model version. [lever_c_demoted from research: ic=1 ai=1.0]

Read on dev.to — LLM tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Opus 5.5 benchmarks show mixed results: first in general, third in secure code

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2 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
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Independent benchmark results for a specific model version. [lever_c_demoted from research: ic=1 ai=1.0]
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Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
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model release, product
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High
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Same-day
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Full methodology in our editorial standards.

COVERAGE [1]

  1. dev.to — LLM tag TIER_1 English(EN) · Nomad ·

    What Independent Benchmarks Say About Opus 5.5

    <p>Two independent benchmark results for Opus 5.5 came out this week, and they don't really agree. One has it in first place. The other has it fast and cheap, but third on secure code once you take out the answers it memorized.</p> <p>A few days ago I <a href="https://promptquick…

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