Anthropic Launches Opus 5 at Half the Cost of Fable 5

Anthropic released its Opus 5 model on 24th July, an upgrade that the company says approaches the capabilities of its more powerful Fable 5 system while costing users half as much. The model is aimed at daily office tasks and computer programming, offering a cheaper entry point to frontier-level AI without the safeguards that constrain Fable 5.

Dianne Penn, an Anthropic product leader, said the release reflected a rapid pace of development. "We're building and continue to consistently deliver frontier intelligence and bring that as accessibly as possible with every model generation," she told Reuters. Opus 5 is less capable than Fable 5 at exploiting cyber vulnerabilities, so its related restrictions are lighter. The startup also said the new model was less susceptible to being tricked into misuse than its other current systems.

Fable 5, released in June, was temporarily pulled after U.S. authorities raised concerns that its capabilities could be diverted to foreign military intelligence. Opus 5 steps into that gap with a different trade-off. Penn recommended users pick Opus 5 for value and Fable 5 for "days-long, very autonomous projects".

The launch comes during a period of intense competition. Chinese startup Moonshot recently released Kimi K3, a 2.8 trillion-parameter open-weight model that approached Fable 5 on some benchmarks. Asked about that model, which the U.S. has accused of benefiting from Anthropic's work, Penn said it "remains to be seen" how open-weight models perform on the kinds of complicated real-world projects users ask Claude to handle.

The pricing strategy behind Opus 5 suggests Anthropic is working to broaden its customer base beyond the large enterprises that have been early adopters of its most advanced systems. By offering near-frontier performance at a lower price, the startup is placing itself across more of the market, from routine office automation to specialised cybersecurity work.