High performance model with great reasoning capabilities, great for building complex agents
The company that provides the model
The number of tokens you can send in a prompt
The maximum number of tokens a model can generate in one request
The cost of prompt tokens sent to the model
The cost of output tokens generated by the model
When the model's knowledge ends
When the model was launched
Capability for the model to use external tools
Ability to process and analyze visual inputs, like images
Support for multiple languages
Whether the model supports fine-tuning on custom datasets
Claude Sonnet 4.5 is Anthropic’s high-performance reasoning model, optimized for complex, multi-step tasks and ideal for building sophisticated agents.
It costs $3.00 per million input tokens and $15.00 per million output tokens.
Claude Sonnet 4.5 supports a context window of up to 200,000 tokens, 1,00,000 if using their beta flag.
It can generate up to 64,000 tokens in a single response.
Claude Sonnet 4.5 was released on September 29, 2025.
Its knowledge cut-off date is January 1, 2025.
Yes, it supports vision inputs and analysis.
Yes, it supports function calling and structured outputs.
Yes, it can handle input and output in multiple languages.
Yes—but only through direct engagement with Anthropic.
You can view the full details and model comparison here:
https://docs.anthropic.com/en/docs/about-claude/models#model-comparison-table
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