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OpenAI Releases GPT-5.3 Codex Model Capable of Building Complex Software Autonomously

OpenAI launched GPT-5.3 Codex, an advanced agentic coding model that can autonomously perform developer tasks and build complex applications from scratch over multiple days. The model is 25% faster than its predecessor and was notably used to debug and improve itself during development. This release came minutes after competitor Anthropic launched its own agentic coding tool, highlighting intense competition in autonomous AI development.