OpenAI and Anthropic intensified their sector rivalry by announcing new agentic coding models on the same day.
OpenAI released GPT-5.3-Codex as an update to its existing Codex tool. The new model operates 25% faster than its predecessor. This version expands beyond code generation to perform a broad range of autonomous computer tasks.
Anthropic simultaneously launched Claude Opus 4.6 with upgraded coding, planning, and debugging capabilities. The update specifically targets performance improvements for larger codebases.
These frontier models represent the current cutting edge of artificial intelligence capability. The dual releases signal an acceleration in the race to provide AI assistants for software development and professional knowledge work.