Claude Opus 4.6 vs GPT-5.3-Codex: Which Agentic Coding Model Offers the Best Value

chatgpt vs claude opus 4.5: coding performance breakdown (building a business website)

OpenAI Launches GPT-5.3-Codex: A Self-Building Coding AI Expanding Capabilities Amidst Fierce AI Rivalry

OpenAI released a new ChatGPT coding model, GPT-5.3-codex, on Feb. 5. The company says it helped build and deploy itself.

OpenAI Introduces GPT-5.3-Codex: Advanced Coding Agent with Broader Work Capabilities

The company says its latest model’s agentic skills also apply to a broader set of knowledge work such as presentations and spreadsheets.