What is Claude's context window?

All Claude 3 models support a 200,000-token context window — one of the largest available. This equates to roughly 150,000 words or about 500 pages of text.

How does Claude tokenization differ from GPT?

Claude uses its own tokenizer, which tends to produce slightly more tokens per word (~1.35) compared to GPT's tiktoken (~1.3). Code and special characters may also tokenize differently.

How is Claude pricing calculated?

Claude Sonnet 4.6 costs $3.00 per million input tokens and $15.00 per million output tokens. Claude Haiku 4.5 is much cheaper at $0.25 per million input and $1.25 per million output.

Is my text sent to Anthropic?

No. Token counting happens entirely in your browser. No text is sent to any server.

Claude Token Counter

Count tokens for Claude Sonnet 4.6, Opus, and Haiku models.

Count tokens for Anthropic Claude models including Claude Sonnet 4.6, Claude Opus 4.6, and Claude Haiku 4.5. See the up to 1M context window usage and per-request cost estimate. Uses word-based heuristics — results are approximate.

Model

Text input

Tokens0

Words0

Characters0

Context window usage

00.0% of 200.0K

Cost estimate

Per request$0.000000

Per 1K requests$0.000000

Daily (100 req)$0.000000

Monthly est.$0.000000

0 input tokens0 output tokens

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Learn More

guide:token counting guide:claude system prompts

FAQ

What is Claude's context window?: All Claude 3 models support a 200,000-token context window — one of the largest available. This equates to roughly 150,000 words or about 500 pages of text.
How does Claude tokenization differ from GPT?: Claude uses its own tokenizer, which tends to produce slightly more tokens per word (~1.35) compared to GPT's tiktoken (~1.3). Code and special characters may also tokenize differently.
How is Claude pricing calculated?: Claude Sonnet 4.6 costs $3.00 per million input tokens and $15.00 per million output tokens. Claude Haiku 4.5 is much cheaper at $0.25 per million input and $1.25 per million output.
Is my text sent to Anthropic?: No. Token counting happens entirely in your browser. No text is sent to any server.