GPT-5.5 Edges Out Claude Opus 4.8 in SWE-Rebench: Cost, Consistency, and Repeatability Redefine AI Coding Agents
OpenAI’s GPT-5.5 has overtaken Anthropic’s Claude Opus 4.8 in the latest SWE-rebench evaluation, according to results published in late May 2026. The benchmarks highlight not just raw performance...