OpenAI releases GPT-5.3-Codex, a combined coding and reasoning model
Model release Provisional 50% confidence first seen
OpenAI announced GPT-5.3-Codex, a unified model that integrates the coding capabilities of GPT-5.2-Codex with the reasoning and professional knowledge from GPT-5.2. The model is designed to handle complex software development tasks that previously required multiple separate models. However, the available coverage lacks specific performance benchmarks, release dates, or concrete capability metrics.