
Similar performance to the flagship model but at a 20% lower price. Designed for programming and complex reasoning.
Anthropic has launched Claude Opus 5.5, a new AI model for developers that matches the flagship Fable model at a 20% lower price, offering support in programming and complex tasks autonomously.
AI-generated summary
Anthropic introduced Claude Opus 5.5 on September 22 as a new affordable option for AI developers.
Released on September 22, the new AI model rivals Fable (the company's flagship AI), but at a lower price. Opus 5.5 is designed for developers who need support in programming and complex reasoning: in fact, the AI model is not limited to answering questions well but is able to independently carry out long projects. All of this, they say from Anthropic, at “4 dollars per million input tokens and 20 dollars per million output tokens”
It's called Claude Opus 5.5 and it's the latest arrival from Anthropic. The US artificial intelligence company has launched a new version of Claude: an AI that offers performance close to that of its flagship model but at a significantly lower cost. Called Opus 5.5, this model ranks second in Anthropic's range, immediately after Fable (the flagship AI of the San Francisco startup) but equaling it "in most tasks" at a price 20% lower, as announced by the company.
How it works
Claude Opus 5.5 thus becomes the company's new flagship model. Officially presented on September 22, the powerful version of artificial intelligence is designed above all for programming and complex reasoning and is capable of managing long jobs autonomously. The difference compared to other inferior models is that Opus 5.5 does not just answer questions well but is able to carry out projects, modify codes and perform accurate tests.
The costs
Opus 5.5, as explained by the company itself, is ideal for developers "interested in creating artificial intelligence solutions that require strong intelligence". Available natively on the Claude platform and in Amazon Web Services, Google Cloud and Microsoft Foundry, Opus 5.5 costs around 20% less than Opus 5: “4 dollars per million input tokens and 20 dollars per million output tokens”, we read on Anthropic's presentation sheet.
Concerns about AI
The new Opus 5.5 arrives at a delicate moment for artificial intelligence. CEO Dario Amodei himself, just ten days ago, had launched an appeal to slow down the development of AI while the UN General Assembly also expressed concerns about a possible loss of control over the IT system. In fact, on Monday 21 September, over 20 heads of state called for the introduction of mandatory tests, in contrast to Donald Trump who yesterday rejected any "globalist project" of control.

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