In the ongoing battle of AI models, Anthropic has unveiled the latest iteration of Sonnet, the firm’s mid-tier offering, which it claims operates much quicker (and at a significantly lower cost) compared to its prior version.

The lab characterizes Sonnet 5.5 as a perfect aide for routine activities — such as programming and generating office documents.

The earlier version, Sonnet 5, was launched roughly three months ago. Its main highlight at that time was its efficient agentic deployment — the capability to operate agents at a reduced expense than rivals.

The major attraction of 5.5, in contrast, is its speed. Anthropic asserts that Sonnet 5.5 is 30 percent swifter than its predecessor, and that its token burn rate is notably slower.

Within Anthropic’s model hierarchy, Sonnet holds less power compared to the Opus model, yet can prove to be more advantageous in specific scenarios due to its nimbleness. Notably, Anthropic’s benchmarks indicate that Sonnet 5.5 outperforms Opus 5.5 in agentic coding, likely owing to its capacity to generate multiple agents while staying within cost parameters.

Sonnet 5.5 is also reported to possess substantial cyber capabilities, with the company asserting that it has “comparable” cyber functionalities to Opus 5. Consequently, Anthropic claims that 5.5 is the first Sonnet iteration to be subjected to the same cyber protections applicable to Fable and Opus.

Furthermore, the company intends to roll out a new version of Haiku — its smallest model — in the forthcoming weeks, although it has not provided a specific timeline for this release.

The past year has witnessed a surge of new model launches from the key AI laboratories. Just last week, OpenAI debuted several new models — including upgraded iterations of Sol and Luna, its mid-tier and economical models. Meta also revealed a new model, which it stated will enhance an upcoming feature related to its smart glasses.