OpenAI’s GPT-5.3-Codex drops as Anthropic upgrades Claude — AI coding wars heat up ahead of Super Bowl ads

OpenAI launched GPT-5.3-Codex as Anthropic released Claude Opus 4.6 in a simultaneous drop that kicks off the AI coding wars, with benchmark claims, enterprise agent ambitions, and cybersecurity ...

This week in AI updates: Claude Opus 4.6, GPT-5.3-Codex, and more (February 6, 2026)

Claude Opus 4.6 improves on Opus’ coding skills, and it now sustains agent tasks for longer and can run more reliably in larger codebases.

Sixteen Claude AI agents working together created a new C compiler

Over two weeks and nearly 2,000 Claude Code sessions costing about $20,000 in API fees, the AI model agents reportedly produced a 100,000-line Rust-based compiler capable of building a bootable Linux ...
Ars Technica

Anthropic says its new AI model “maintained focus” for 30 hours on multistep tasks

Claude is popular with some software developers thanks to Claude Code, and Anthropic is confident about the latest version of Sonnet’s coding capability: “Claude Sonnet 4.5 is the best coding model in ...