The day in AI
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Launches and products
27 Feb 2025SesameConversational Speech Model (CSM) and Maya/Miles demo Sesame's CSM voice demo crossed the 'uncanny valley' for many listeners; CSM-1B was open-sourced under Apache 2.0.27 Feb 2025OpenAIGPT-4.5 GPT-4.5, OpenAI's largest non-reasoning model, ships as a research preview at $75/$150 per million tokens, then is retired from the API within months.