Claude Opus 4.7 vs GPT-5.5 for coding in 2026: Claude wins We ran 15 real coding tasks through Claude Opus 4.7 and GPT-5.5 via LLMTest. Claude won 10, GPT-5.5 won 2, 3 ties. Full outputs and verdict inside. May 4, 2026 · 8 min read h2hbenchmarksclaude