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GPT-5 Thinking in ChatGPT is shockingly good at search and demonstrates the potential of combining tool calling with chain-of-thought reasoning (Simon Willison/Simon Willison's Weblog)

Simon Willison / Simon Willison's Weblog : GPT-5 Thinking in ChatGPT is shockingly good at search and demonstrates the potential of c...

3 September 2025

Source: Sierra, which builds AI customer service agents, nears a $350M raise at a $10B valuation, up from $4.5B in October 2024, and is set to top $100M in ARR (Ina Fried/Axios)

Ina Fried / Axios:
Source: Sierra, which builds AI customer service agents, nears a $350M raise at a $10B valuation, up from $4.5B in October 2024, and is set to top $100M in ARR  —  Sierra, which builds custom AI agents for enterprise customer service, is nearing a deal for a $350 million financing round …

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