Anthropic unveils Sonnet 5.5: a faster, cheaper mid-tier model

Anthropic has released Sonnet 5.5, the newest version of its mid-tier model Sonnet. According to TechCrunch, the company describes it as a much faster and significantly cheaper work partner than its predecessor, highlighting everyday tasks such as coding and creating office documents.

What does Sonnet 5.5 promise?

Sonnet 5 was announced about three months ago, and its selling point at the time was running agents at a lower cost than competitors. The main promise of Sonnet 5.5 is speed: Anthropic says the model is 30% faster than its predecessor and that its rate of token burn is significantly slower.

In Anthropic's model hierarchy, Sonnet is less powerful than Opus but can be more useful in some situations because of its agility. In the company's benchmarks, Sonnet 5.5 performs better than Opus 5.5 on agentic coding. The report suggests this may be because it can spawn multiple agents without exceeding cost limits.

Have the safeguards changed?

Yes. Anthropic says Sonnet 5.5 has cyber capabilities "comparable" to Opus 5. As a result, the model is the first Sonnet subject to the same cyber safeguards that apply to Fable and Opus. The company also plans to release a new version of Haiku, its smallest model, in the coming weeks, without giving a firm date.

What should software and product teams in Turkey do?

Choosing a model is no longer just about picking the most powerful one; it means balancing cost and latency per task. Teams running many agents, or high volumes of code and document work, should re-measure benchmarks with their own data: running the same workloads on the current model and on Sonnet 5.5 and comparing time, token use and output quality is a firmer basis for a decision than vendor claims. Teams producing Turkish-language content should also test language quality separately; the source has no data on that.