Anthropic has released its Claude Opus 4.5 artificial intelligence model, which the company described as “the best model in the world” for coding tasks.
Opus 4.5 is available on Anthropic’s apps, Claude’s application programming interface, and through AI platforms Microsoft Foundry, Amazon Bedrock, and Google Vertex AI.
Claude Opus 4.5 is “intelligent, efficient, and the best model in the world for coding, agents, and computer use,” wrote Anthropic. “It’s also meaningfully better at everyday tasks like deep research and working with slides and spreadsheets.”
“Opus 4.5 is a step forward in what AI systems can do, and a preview of larger changes to how work gets done.”
The model significantly outperforms its predecessors’ coding abilities, according to Anthropic. It surpasses Claude Sonnet 4.5, released in September, and Opus 4.1 at seven out of eight programming languages on its SWE-bench Multilingual coding test.
Anthropic also said Claude is less susceptible to prompt injection attacks than Google’s Gemini 3 Pro model and OpenAI’s GPT-5.1 model, both released earlier in November. These attacks attempt to trick an AI model into unintended behaviour using deceptive prompts.
Opus 4.5 will be Anthropic’s default model for its Pro, Max, and Enterprise subscription offerings.
Anthropic is reportedly valued at US$350 billion as of last week, after the company announced a $5 billion investment from Microsoft and $10 billion in investments from Nvidia. This is a large increase from its $183 billion valuation in September.
