Anthropic announced on Monday that it will permanently maintain the initial pricing of Claude Sonnet 5, canceling the plan to increase input token prices to $3 per million and output token prices to $15 per million, which was originally scheduled for late August. This adjustment is particularly important for AI agent developers, as it means that businesses building workflows based on Sonnet 5 can achieve more stable cost expectations. Anthropic confidentially filed its IPO registration documents on June 1, and the market expects it to potentially go public later this year.