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OpenAI · Codex
OpenAI releases GPT-5.3 Codex, minutes after Anthropic
OpenAI says GPT-5.3 Codex is 25% faster than GPT-5.2 and was instrumental in creating itself.
Anthropic · Claude
Anthropic releases Claude Opus 4.6 with agent teams that work together
Opus 4.6 has a 1 million token context window and a new "agent teams" feature. Claude now also works inside PowerPoint.