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OpenAI steps up coding push with GPT-5.3 Codex to counter Anthropic

OpenAI has introduced its latest AI model, GPT-5.3 Codex, as it intensifies its push into coding AI and seeks to check rival Anthropic. The company said the model goes beyond writing and reviewing code to handle most computer tasks a developer can perform, including tests, fixes and workflow updates. OpenAI said performance and reasoning speed improved. Competition is also rising as Anthropic expands Claude Code and rolls out Claude Opus 4.6.