OpenAI releases GPT-5.3-Codex, a coding model that helped build itself

Anthropic, one of OpenAI's chief rivals, also released a new coding model today, Claude Opus 4.6. Earlier this week, OpenAI ...

OpenAI debuts GPT-5.3-Codex: 25% faster and setting new coding benchmark records

Today, OpenAI announced GPT-5.3-Codex, its most capable agentic coding model to date. The company says the model achieved ...

Anthropic and OpenAI release dueling AI models on the same day in an escalating rivalry

The rivaling AI companies pushed GPT-5.3-Codex and Claude Opus 4.6, and had back-to-back appearances on a tech and business ...

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

Anthropic's Claude Opus 4.6 and OpenAI's GPT-5.3-Codex go head-to-head in agentic coding, but are there any differences?