❯ Anthropic Makes Claude Sonnet 5 Entry Pricing Permanent, Scraps September Price Hike

PRICING HELDAnthropic has made Claude Sonnet 5’s entry pricing permanent — $2 per million input tokens and $10 per million output tokens — with the plan to raise prices to $3 and $15 on September 1 scrapped, effectively avoiding a 50% hidden price hike. The news was posted directly by the official Claude account on X rather than through a product blog, carrying a hint of urgency — as if wary of catching developers off guard.

HIKE ORIGINSonnet 5 launched this June with the $2/$10 pricing pitched as a “limited-time offer through August 31,” and several cloud cost-management platforms had already marked September 1 as Claude bill spike day, advising enterprise customers to budget ahead. The most direct comparison in the developer community is the GPT-5.6 family’s pricing band — OpenAI has made no similar move to convert a temporary promo into a permanent price. By locking the price in place now, Anthropic has effectively made the first move to hold onto customers in the mid-tier segment, the most fiercely competitive price band.

WHO'S AFFECTEDFor enterprise customers already running Sonnet 5 in production, the most immediate change is that next-quarter cost forecasts can drop a variable — no need to hold buffer budget for a September increase window. For Anthropic itself, this reads more as a defensive move: in the mid-tier model price war, whoever locks down uncertainty first wins developers’ migration decisions first.

▪ SIGNALThe mid-tier model price war has shifted from “who’s cheaper” to “who’s more stable” — stability itself has become a form of product strength.