Claude Opus 4.5

Claude Opus 4.5 emerged as Anthropic's flagship push into the AI coding and agentic frontier, positioned from the start as the most capable model for software engineering, autonomous agents, and computer use. The model builds on its lineage with a 200,000-token context window and a new effort parameter—defaulting to high but tunable for faster responses—that lets users trade depth for speed depending on the task. It set a new state-of-the-art on SWE-bench Verified, a benchmark measuring real-world software engineering problem-solving, reclaiming ground that Anthropic had ceded to recent releases from OpenAI and Google. Beyond pure code, the design intent extends to knowledge work: the model was specifically improved for deep research tasks, document reasoning, and handling office documents like spreadsheets and slide decks.

The release cadence itself tells a story—Claude Opus 4.5 arrived just weeks after Opus 4.1, reflecting rapid iteration in Anthropic's development pipeline. Its integration into Perplexity's Deep Research tool and Databricks' enterprise stack shows where the model is finding traction: long-running research pipelines, data engineering workflows, and agentic systems that need to reason over large documents or query databases at scale. The more accessible pricing tier signals a deliberate push to bring Opus-level intelligence beyond elite developers to teams and enterprises building AI-native products. As a platform, it arrives alongside updates to the Claude Developer Platform, Claude Code, and consumer apps, suggesting Anthropic views this model as part of a broader ecosystem shift in how work gets automated and augmented.