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February 2026 AI Models: What Codex and Gemini 3.1 Pro Change

Last Updated: August 27th, 2026

This cycle's new models come down to three names a lead dev must weigh: Gemini 3.1 Pro, GPT-5.3 Codex, and Claude Opus 4.6. Each wins a different slice of the work. None wins everywhere. That matters before you bet a production stack on any one of them. Short version from the benchmark data: Gemini…