Claude 4.5 is available everywhere today. Through the API, the model maintains the same pricing as Claude Sonnet 4, at $3 per million input tokens and $15 per million output tokens. Developers can access it through the Claude API using “claude-sonnet-4-5” as the model identifier.
Other new features
Some ancillary features of the Claude family got some upgrades today, too. For example, Anthropic added code execution and file creation directly within conversations for users of Claude’s web interface and dedicated apps. Along those lines, users can now generate spreadsheets, slides, and documents without leaving the chat interface.
The company also released a five-day research preview called “Imagine with Claude” for Max subscribers, which demonstrates the model generating software in real time. Anthropic describes it as “a fun demonstration showing what Claude Sonnet 4.5 can do” when combined with appropriate infrastructure.
A screenshot of the available Anthropic AI models for Claude Max users seen in the Claude web interface on September 29, 2025.
