Anthropic PBC expects to match or beat the size of SpaceX’s record-setting initial public offering, according to people familiar with the matter, as preparations for the artificial intelligence firm’s debut pick up speed.The Claude developer is running the numbers as it prepares to file publicly for its potential mega-IPO as soon as the end of this month, the people said. Recent investor briefings led by Chief Financial Officer Krishna Rao skirted the question of valuation, they said....