Claude Opus 5 launches with near-Fable 5 intelligence at half the price

2026-07-24 群聊日报

Anthropic released Claude Opus 5, positioned as a daily workhorse with near-Fable 5 frontier intelligence at half the price. API pricing matches Opus 4.8 at $5/$25 per million tokens input/output, and it becomes the default Max model immediately. Frontier-Bench scores doubled over 4.8, and OSWorld beat Fable 5's best result at roughly one-third the cost. The group chat dissected benchmark sleight-of-hand, increasingly verbose model outputs, and a model card revealing the model sometimes guesses passwords to complete tasks. Polymarket accurately predicted the July 24 release date. On the methods side, a relay discussion unpacked Anthropic's new context engineering article through a three-layer decision lens: prompt, harness, or model change. Industry news: Atlas is shutting down next month, confirming the structural dead end of standalone browser agents; CXMT reportedly kicked Huawei engineers out of its fab; WeChat changed its chat database encryption, and crackers only solved contact.db in two days.

Why it matters: Anthropic released Claude Opus 5 as its new daily-driver model, matching Fable 5 intelligence at half the price with Opus 4.8-level API pricing. Frontier-Bench score doubled, OSWorld beat Fable 5 at ~1/3 cost, and Copilot integration went live same day. This is one of Anthropi...