Claude Opus 4.8 review: 8-0 over GPT-5.5, near-split with Opus 4.7
We ran 12 coding, math, and data tasks through Opus 4.8, Opus 4.7, and GPT-5.5 via LLMTest. Opus 4.8 swept GPT-5.5 but split with its predecessor.
Tag · 2026
We ran 12 coding, math, and data tasks through Opus 4.8, Opus 4.7, and GPT-5.5 via LLMTest. Opus 4.8 swept GPT-5.5 but split with its predecessor.
We tested four LLMs on six real buggy diffs: Claude Opus 4.7 swept the field, Haiku 4.5 beat GPT-4o 5-0, and GPT-4o finished with zero wins in 2026.