Deep Suite

Deep Suite is a software engineering benchmark designed to provide more accurate model evaluations than existing public benchmarks. It offers four major advantages: contamination-free tasks, high diversity, real-world complexity, and reliable verification. According to Deep Suite's testing, GPT 5.5 outperforms Opus 4.7.

Anthropic released Claude Opus 4.8, but experts like Greg Eisenberg and Matt Wolf argue it’s nearly indistinguishable from 4.7, signaling a shift to iPhone-style incremental upgrades; Deep Suite data shows GPT 5.5 outperforms Opus 4.8 in coding tasks at lower cost and token usage, while OpenAI’s Codex saw undisclosed but impactful updates.

SWEbench benchmark is invalid as GPT 5.5 scores 70% on Deep Suite versus Opus 4.7's 54%, showing opposite trends in SWEbench, indicating unreliability.