Anthropic Adds Claude Sonnet 5.5 as a Faster, Cheaper Option Below Opus 5.5
Anthropic has introduced Claude Sonnet 5.5, a lower-cost, faster companion to Opus 5.5 that the company says improves substantially on Sonnet 5 while keeping the same low operating cost.
The new model is described as the economy version of Opus 5.5, built to prioritize speed and to run at a significantly lower cost than its larger sibling. Anthropic's pitch is that buyers give up power only at the margin: Sonnet 5.5 keeps much of the capability of the top-tier model while costing considerably less to operate.
That trade-off does not make Sonnet 5.5 a straight replacement for Opus 5.5. Android Authority reported that Opus 5.5 still edges out Sonnet in many tasks, so the flagship remains the stronger choice for workloads where the highest available performance matters more than price or latency.
The timing of the release puts the two models barely a week apart. Anthropic introduced Claude Opus 5.5 just over a week before the Sonnet announcement, and that launch reached new performance and communication benchmarks for the company, according to the report.
Against the previous generation, the company frames Sonnet 5.5 as a more substantial step forward than the naming might suggest, with the gains coming on top of Sonnet 5 rather than replacing it. Anthropic says the newer Sonnet retains the same low cost as the model it succeeds, so the improvement arrives without a corresponding increase in price.
The Sonnet line has already been cast as a value option before. Android Authority noted that Claude Sonnet 5 delivered real benefits over Opus 4.8, an earlier flagship, which established the pattern of a smaller Anthropic model closing ground on a larger one from the previous generation.
The report places the release in a wider competitive context: model developers are under pressure to improve along several axes at once, including speed, cost, safety and raw capability, rather than advancing on a single dimension. On that reading, Sonnet 5.5 is aimed at buyers who weigh operating expense and throughput alongside benchmark scores, a segment where Anthropic's own Opus tier competes less directly on price.
Anthropic has not published benchmark figures for Sonnet 5.5 in the material reviewed, and the comparison with Opus 5.5 rests on Android Authority's assessment that the larger model still leads on many tasks rather than on a disclosed set of test results.