Claude Opus 5.5 (AU)

Anthropic released Claude Opus 5.5 on September 22, 2026, calling it the first model in a new Claude 5.5 family and its most advanced system to date. The company said Opus 5.5 runs about 40% cheaper than Opus 5 and generates output more than 30% faster, while emphasizing capabilities for complex, long-running tasks such as large-scale code work. Pricing was set at $4 per million input tokens and $20 per million output tokens, with cache reads at $0.20 per million, and Anthropic cited a 680,000-line migration finished in under a day. Benchmarks included 66.4% on Terminal-Bench 4.0 and 54.4% on FrontierCode v1.1, with availability on AWS, Google Cloud, and Microsoft Azure under the identifier claude-opus-5-5. Sonnet 5.5 and Haiku 5.5 are expected in the coming weeks.

Pulse 2.0 reported on Anthropic's launch of Claude Opus 5.5 on September 22, 2026, describing it as the first model in the new Claude 5.5 family and noting that its performance is comparable to Claude Fable 5.1 across most tasks while costing 40% less to run than Claude Opus 5 on typical workloads. Anthropic reported t The Pulse 2.0 piece added that Anthropic improved Opus 5.5's communication style in response to user feedback, designing it to communicate more naturally, prioritize important information, and follow user-specified writing. Launch was accompanied by increased usage limits for Claude's paid subscription plans, and Anthr

Metir's explainer confirmed Anthropic's September 22, 2026 release of Claude Opus 5.5, summarizing the key improvements as roughly 30% faster replies than Opus 5, 20% lower price per word with up to 40% less cost per task, and benchmark performance that beats Fable 5.1 on most published coding tests. The article noted The Metir piece confirmed availability through Anthropic and on AWS, Google Cloud, and Microsoft Azure, and reported Anthropic's launch-day benchmark scores against Fable 5.1, Opus 5, and OpenAI's GPT-6 Astra across Terminal-Bench 4.0, CursorBench 4.0, FrontierCode v1.1, AutomationBench, Terminal-Bench-Science 0.1, Hum

On September 22, 2026, Anthropic released Claude Opus 5.5, its most capable tier in the Claude lineup, and Reuters confirmed the launch details based on Anthropic's announcement. The company stated that Opus 5.5 delivers performance comparable to its top-tier Claude Fable 5.1 while costing roughly 40% less to run than Reuters reported that Opus 5.5 underwent external testing by independent AI safety research groups Frontier Design and METR prior to launch, and the release includes safeguards that had previously been reserved for Anthropic's most capable systems. The launch coincides with CEO Dario Amodei's earlier call for the globa