OpenAI secures $300bn valuation after $40bn SoftBank-led funding round

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OpenAI has raised $40bn in new funding from SoftBank and other investors, valuing the ChatGPT maker at $300bn as it becomes one of the best-funded private start-ups in the world.

SoftBank was providing 75 per cent of the funding, according to one person familiar with the finances, while 25 per cent would be contributed by additional investors including Microsoft, Coatue…