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Claude Opus 4.6 vs Codex 5.3: Real Developer Test

This story is from 2026-10-04. It is preserved in the archive; the latest stories are on the live feed.

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 "we built the future of coding" on the exact sam…

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  1. 2026-10-04 08:45 · DEV Community — AI
    Claude Opus 4.6 vs Codex 5.3: Real Developer Test

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