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Claude Opus 5.5 paired with Claude Code topped six of AAArenaβs 12 human-program ladders, according to a paper submitted October 8. The benchmark measures iterative policy revision with fixed model weights, testing long-horizon agent development rather than one-shot prompting. [AAArena paper](https://arxiv.org/abs/2610.12341)
Artificial Analysis tested four frontier image-editing models across 30 consecutive edits of the same photo, measuring how much of the original scene survived outside the requested changes. Ideogram 4.5 and FLUX 3 preserved at least 95% of pixels during small edits, while GPT Image 2.5 Sunburst and Nano Banana 2.1 introduced substantially more cumulative drift.

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