--- format: "aidr-story-markdown/v1" id: "ad3e22f8e14956f1deb8bf1d7c0c838f6a9ec459f20eb3b0748fdda07d5945e3" canonical_url: "https://aidr.today/ad3e22f8?lang=en" title: "Anthropic Launches Claude Sonnet 5.5 With First Opus Class Cyber Safeguards" lang: "en" requested_lang: "en" available_langs: ["en","vi"] translation_fallback: null fallback_fields: [] published_at: "2026-09-29T17:26:11.000Z" category: "Releases" topics: ["anthropic","llm"] source_urls: ["https://marketbrief.now/ai/anthropic-launches-claude-sonnet-55-with-first-opus-class-cyber-safeguar-9ce2505e","https://huggingnews.com/ai/anthropic-launches-claude-sonnet-55-with-first-opus-class-cyber-safeguar-9ce2505e"] summary: "The second member of the 5.5 model family is now live on the Platform and Claude Code, providing a tool that is more than 30% faster per task than the previous version. Anthropic's new release maintains a list price of $2 for input and $10 for output per 1M tokens, with $0.20 cache reads. It is the first in the Sonnet series to feature Opus class cyber safeguards and outperforms OpenAI's GPT 6 Sol in computer vision tasks with 41% lower latency and a 30% reduction in cost. The launch coincides with OpenAI's DevDay, where the company unveiled over 20 features including Codex plugins and a 1,000 hour internal agent run. OpenAI will reopen its $200 Pro subscription tomorrow, which nets usage roughly half that of its previous API plans. However, reports from the Wall Street Journal indicate that GPT 6.1 Astra will not be shipped by its October target due to safety and alignment issues." --- # Anthropic Launches Claude Sonnet 5\.5 With First Opus Class Cyber Safeguards > [Open the canonical story]() **Published:** 2026-09-29T17:26:11.000Z **Category:** Releases **Topics:** anthropic, llm ## Summary The second member of the 5\.5 model family is now live on the Platform and Claude Code, providing a tool that is more than 30% faster per task than the previous version\. Anthropic's new release maintains a list price of $2 for input and $10 for output per 1M tokens, with $0\.20 cache reads\. It is the first in the Sonnet series to feature Opus class cyber safeguards and outperforms OpenAI's GPT 6 Sol in computer vision tasks with 41% lower latency and a 30% reduction in cost\. The launch coincides with OpenAI's DevDay, where the company unveiled over 20 features including Codex plugins and a 1,000 hour internal agent run\. OpenAI will reopen its $200 Pro subscription tomorrow, which nets usage roughly half that of its previous API plans\. However, reports from the Wall Street Journal indicate that GPT 6\.1 Astra will not be shipped by its October target due to safety and alignment issues\. ## Sources - [Story source]() - [Story source]()