Claude Sonnet 5.5 (Global)

Reuters reports that Anthropic launched Claude Sonnet 5.5 on September 28, 2026, pricing it at $2 per million input tokens and $10 per million output tokens, unchanged from its predecessor Sonnet 5. The company said the model needs fewer tokens to complete the same work, framing it as a faster, lower-cost complement to the Opus 5.5 flagship launched the prior week at $4/$20 per million tokens. The report notes Sonnet 5.5 is Anthropic's second launch in the Claude 5.5 family, with a third Haiku 5.5 model designed for fast, high-volume work due soon. Enterprise customers reportedly account for about 80% of Anthropic's business, including Salesforce, Databricks, Goldman Sachs, and Novo Nordisk. The story also notes CEO Dario Amodei's recent call for the global AI community to slow the pace of capability releases.

SiliconANGLE corroborates Anthropic's September 28, 2026 release of Claude Sonnet 5.5, emphasizing the vendor's claim that the model runs roughly 30% faster than the prior-generation version. The coverage frames the launch as Anthropic's second Claude 5.5-family model in quick succession, following Opus 5.5 the previous week. The article positions Sonnet 5.5 as a mid-tier efficiency-focused alternative for enterprise workloads, reinforcing Anthropic's strategy of offering near-frontier capability at lower per-task cost. It highlights that speed and reduced token consumption are the key differentiators rather than raw pricing changes.

TechCrunch reports that Anthropic's Claude Sonnet 5.5, released September 28, 2026, is positioned as a significantly cheaper and faster work partner aimed at everyday tasks like coding and creating office documents. The article highlights a 30% speed improvement over Sonnet 5 and a markedly slower token burn rate, with the model arriving roughly three months after its predecessor. Sonnet 5.5 is described as the first Sonnet variant subject to the same cyber safeguards applied to Opus and Fable. Anthropic's benchmarks indicate Sonnet 5.5 outperforms Opus 5.5 on agentic coding, attributed to its ability to spawn multiple agents without exceeding cost limits. The company claims the model has cyber capabilities comparable to Opus 5, a first for the Sonnet line. Anthropic also confirmed a new Haiku model will follow in the coming weeks, though no firm release date was given.

Anthropic released Claude Sonnet 5.5 on September 28, 2026, as a faster, more efficient mid-tier workhorse model that approaches the performance of its newly launched Opus 5.5 sibling. The company reports output generation is over 30% faster than Sonnet 5, and per-task cost drops as much as 30% because the model uses fewer tokens and fewer tool calls rather than a lower sticker price. API pricing stays at $2 per million input tokens and $10 per million output tokens, matching its predecessor. On Anthropic-run evaluations, Sonnet 5.5 scored 1844 on GDPval-AA (versus 1846 for Opus 5.5 and 1449 for Sonnet 5) and 1811 on AA-Briefcase, while reaching 80.1% on OSWorld 2.1. Anthropic positions the model for well-defined tasks such as software debugging, coding, document creation, spreadsheets, and interface design, leaving ambiguous or open-ended work to Opus 5.5. The launch is the second release in the Claude 5.5 family, with a Haiku 5.5 model expected in coming weeks.

Techzine reports that Anthropic released Claude Sonnet 5.5 on September 28, 2026, as a more compact, efficiency-focused counterpart to the newly launched Opus 5.5. The article highlights significant benchmark gains over Sonnet 5, including 70.6% on Terminal-Bench 4.0 versus the predecessor's 10.3%, and 61.6% on a chart-reading test (Chartography) compared to 15.6% previously. At "Max effort" settings, Sonnet 5.5 approaches Opus 5.5 capability, positioning the Sonnet-to-Opus transition as a continuous spectrum of speed and cost trade-offs. The story notes that a Haiku 5.5 model is also expected as part of the broader Claude 5.5 generation rollout. The article additionally covers OpenAI's decision to cancel the planned Astra 6.1 release for security reasons.