Question 1

How much does Claude Sonnet 4.5 cost?

Accepted Answer

Claude Sonnet 4.5 costs $3 per 1 million input tokens and $15 per 1 million output tokens. This pricing is set by Anthropic.

Question 2

What tokenizer does Claude Sonnet 4.5 use?

Accepted Answer

Claude Sonnet 4.5 uses the cl100k_base tokenizer. This tokenizer has a vocabulary of ~100,000 tokens and is widely used across many models.

Question 3

What is Claude Sonnet 4.5's context window?

Accepted Answer

Claude Sonnet 4.5 supports a context window of 200K tokens (200,000 tokens). The maximum output length is 64K tokens.

Question 4

How does Claude Sonnet 4.5 compare to other models?

Accepted Answer

You can compare Claude Sonnet 4.5's pricing and capabilities against other LLMs in the comparison table above, or visit the full pricing page for a side-by-side view of all models.

Question 5

How do I count tokens for Claude Sonnet 4.5?

Accepted Answer

Use the token counter at the top of this page or visit the homepage calculator. Paste your text and it will show the exact token count and cost for Claude Sonnet 4.5 using the cl100k_base tokenizer.

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