The second model in the Claude 5.5 family keeps Sonnet 5's $2/$10 per-million-token pricing but generates output over 30% faster and completes a task for up to 30% less by using fewer tokens and tool calls.
2026-09-28 · by Moe Ameen
Anthropic released Claude Sonnet 5.5 on September 28, 2026, the second model in its Claude 5.5 family after Claude Opus 5.5, which shipped September 22. Anthropic positions Sonnet 5.5 as its most capable mid-tier model and a faster, lower-cost complement to Opus 5.5: where Opus 5.5 is built for complex work that needs careful judgment, Sonnet 5.5 is strongest at well-scoped everyday tasks — fixing bugs, and producing polished documents, slides, and spreadsheets. Anthropic also says it has "a sharp eye for design."
The headline is efficiency rather than a price cut. Sonnet 5.5 keeps Sonnet 5's pricing exactly: $2 per million input tokens and $10 per million output tokens (with cache reads at $0.20 and cache writes at $2.50 per million). What changes is throughput and cost per finished task. Anthropic says the model generates output more than 30% faster than Sonnet 5 and completes a typical task for up to 30% less by using fewer tokens and fewer tool calls to reach the same result. The company adds that on several benchmarks, Sonnet 5.5 running at Low or Medium effort can surpass Sonnet 5's best score at roughly one-tenth the cost per task.
Sonnet 5.5 takes text and image input and returns text. It is available under the model identifier `claude-sonnet-5-5` on the Claude API and across the major clouds — Amazon Web Services, Google Cloud, and Microsoft Azure — and Anthropic says it is offered with zero data retention. As always, treat exact pricing, effort behavior, and availability as a snapshot and check Anthropic's docs before relying on any figure.
The move a creator makes on this is not switching chat windows — it is running more output through automation now that each task is faster and cheaper. Sonnet 5.5's efficiency gain shows up most where content is generated in bulk on a schedule, and that is exactly where Kompozy lives. Kompozy runs its generation on Claude under the hood, so a step-change in the drafting model flows into your pipeline without you re-wiring anything: you write a Persona Brief and approve outputs, and the engine drafts captions, scripts, blogs, and threads in your voice, then does the part no language model does — rendering persona and avatar video, building carousels and quote cards, reframing and captioning clips per platform, and scheduling and publishing across the eight social platforms plus blog and email from one queue. When the writing half gets 30% faster and cheaper per task, the binding constraint shifts entirely to production and distribution, which is the half Kompozy owns.
There is also an immediate play in the launch itself. A model release this widely searched is a timely, high-intent topic your audience wants a take on this week. Drop your point of view into Kompozy as a source and it fans one angle into a Blog Article, a Carousel explainer, short captioned clips, and platform-native posts, then schedules and publishes them across your channels. Being early and clear on a story like this is how one take becomes a week of content.
Anthropic released Claude Sonnet 5.5 on September 28, 2026. It is the second model in the Claude 5.5 family and its most capable mid-tier model — a faster, lower-cost complement to Opus 5.5, strongest at well-scoped everyday tasks like fixing bugs and producing polished documents, slides, and spreadsheets.
The per-token price is unchanged from Sonnet 5 ($2 per million input, $10 per million output). Sonnet 5.5 is cheaper per finished task because it uses fewer tokens and fewer tool calls to reach the same result, which Anthropic says can lower total task cost by up to 30% while also generating output more than 30% faster.
No. It is a text-and-reasoning model that takes text and image input but generates no images, video, or audio and has no publishing layer. Anthropic's note that it has a sharp eye for design refers to layout and wording judgment, not rendered graphics. To turn its writing into finished, scheduled posts you pair it with a content engine like Kompozy.