Anthropic Launches Opus 4.5 with Chrome and Excel Integrations

Anthropic has unveiled Opus 4.5, its latest flagship model, marking the final release in the 4.5 series. This announcement occurred on a Monday, following the previous launches of Sonnet 4.5 in September and Haiku 4.5 in October. Opus 4.5 showcases advanced performance across various benchmarks, including coding, tool usage, and problem-solving capabilities.

Key Features of Opus 4.5

• State-of-the-art performance on benchmarks like SWE-Bench, Terminal-bench, tau2-bench, and ARC-AGI 2.
• First model to achieve over 80 percent on the verified SWE-Bench coding benchmark.
• Enhanced computer and spreadsheet functions through integrations.

Alongside the model, Anthropic is launching Claude for Chrome and Claude for Excel. The Chrome extension will be accessible to all Max users, while the Excel-focused model will be available for Max, Team, and Enterprise users.

Memory Improvements and Endless Chat Feature

Opus 4.5 features significant memory enhancements for managing long-context operations. Dianne Na Penn, Anthropic’s head of product management for research, explained that these modifications allow for better long-context memory management. This is crucial for applications requiring detailed context knowledge.

The new model also introduces an “endless chat” feature. This allows paid Claude users to engage in uninterrupted conversations, even when reaching the context limit. In such instances, Opus 4.5 will intelligently compress prior memory without user notification.

Strategic Applications of Opus 4.5

Many advancements aim to support agentic use-cases. In these scenarios, Opus 4.5 can act as a lead agent, overseeing Haiku-powered sub-agents. Effective memory integration is vital, as it enables the model to navigate through extensive code bases and documents, refining its responses as necessary.

Competitive Landscape

Opus 4.5 enters a highly competitive market, contending with other leading models. Notable competitors include OpenAI’s GPT 5.1, launched on November 12, and Google’s Gemini 3, which debuted on November 18. The enhancements in Opus 4.5 position it to remain a key player in the evolving AI landscape.