Claude Opus 4.6 Fast Mode, ads in ChatGPT, ElevenLabs raises $500M
Anthropic launches 2.5x faster mode for Opus 4.6, OpenAI tests ads in ChatGPT, ElevenLabs closes $11B Series D, GPT-5.3-Codex arrives in Copilot, and Mistral releases Voxtral Transcribe 2.