Claude Opus 4.6 vs Codex 5.3: Real Developer Test
Anthropic dropped Claude Opus 4.6 on February 4, 2026. OpenAI released GPT-5.3-Codex the same day. Same launch day. Both claiming to be the best coding agent ever built. The timing wasn't an accident. This was a coordinated flex. Two companies saying...
Feb 7, 20266 min read2
