OpenAI launches new agentic coding model only minutes after Anthropic drops its own

2026-02-05 · Source: AI News & Artificial Intelligence | TechCrunch · Field: Technology & Digital — Artificial Intelligence & Machine Learning, Software Development & Engineering, Emerging Technologies & Innovation · Depth: Fundamental Awareness, quick

Summary

OpenAI has launched GPT-5.3 Codex, a new agentic coding model designed to enhance its recently released Codex tool for software developers. The company claims this model elevates Codex beyond basic code writing and review, enabling it to perform a wide range of developer and professional tasks, including creating complex games and applications from scratch over several days. GPT-5.3 Codex is reportedly 25 percent faster than its predecessor, GPT-5.2, and is notable for being the first OpenAI model instrumental in its own creation, as early versions were used by staff for debugging and performance evaluation. This release closely followed Anthropic's launch of its own agentic coding model, with Anthropic moving its release time up by 15 minutes to precede OpenAI's planned announcement.

Key takeaway

For AI Engineers and software developers evaluating new coding agents, GPT-5.3 Codex represents a significant leap in capability, promising faster development of complex applications. You should explore its potential for automating multi-day coding tasks and consider how its self-creation methodology might inform your own model development and debugging processes.

Key insights

GPT-5.3 Codex transforms agentic coding by enabling complex application development and self-debugging capabilities.

Principles

• Agentic models can accelerate software development.
• Self-improvement loops enhance model performance.

Method

OpenAI utilized early versions of GPT-5.3 Codex for its own debugging and performance evaluation, demonstrating a self-creation methodology for model refinement.

In practice

• Use agentic tools for complex software projects.
• Integrate self-evaluation into model development.

Topics

• Agentic Coding
• GPT-5.3 Codex
• Software Development Tools
• AI Model Self-Improvement
• AI Competition

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Related on AIssential

• Is OpenAI’s GPT-5.3 Codex Worth the Hype? — GPT-5.3-Codex functions as an agent, integrating coding with planning, reasoning, and execution for complex tasks.
• OpenAI's new Codex app hits 1M+ downloads in first week — but limits may be coming to free and Go users — Agentic coding tools are rapidly gaining adoption, shifting focus from copilots to autonomous operators.
• OpenAI’s GPT-5.3-Codex drops as Anthropic upgrades Claude — AI coding wars heat up ahead of Super Bowl ads — OpenAI's GPT-5.3-Codex sets new benchmarks in coding and general agentic capabilities, intensifying the AI enterprise market competition.
• OpenAI's new coding model GPT-5.3-Codex helped build itself during training and deployment — GPT-5.3-Codex is OpenAI's faster, more capable coding model, uniquely contributing to its own development.
• 🤖 AI Agents Weekly: GPT-5.5, DeepSeek-V4 Preview, Kimi K2.6 Agent Swarm, Diversity Collapse, Sakana Fugu, and More — GPT-5.5 is an agentic-first model designed for complex multi-step tasks, offering significant gains in coding and knowledge work.
• OpenAI kills its dedicated coding model Codex again, folding it into GPT-5.5 — OpenAI has integrated its dedicated Codex coding model into the main GPT-5.x series, enhancing agentic coding capabilities.

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Editorial summary, takeaway, and curation by AIssential. Original article published by AI News & Artificial Intelligence | TechCrunch.