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HomeProductsAI Token CounterClaude Opus 5
Anthropic · tokenizer estimate

Claude Opus 5 token counter

Count tokens in your browser for Claude Opus 5, check the result against its context window, and see where each model figure comes from.

  • 1M context
  • 128K max output
  • Local estimate
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Context metadata verified: 8/13/2026, 12:00:00 AMSource: Anthropic official documentation

Provider

Anthropic

Context window

1,000,000 tokens

Maximum output

128,000 tokens

Tokenizer strategy

Local estimate

Tokenization accuracy

The displayed count is a labeled local estimate, not a provider-exact token count. Provider request wrappers, tool schemas, images, cached content, and reasoning accounting can add tokens beyond plain prompt text.

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Pricing metadata

Input: $5 per million tokens

Output: $25 per million tokens

Verified 2026-11-07; provider rules and tiering can change the final bill.

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Metadata freshness

Context metadata was reviewed on 2026-08-13. It is currently past the review interval. Model APIs can still change; use the linked official source for deployment decisions.

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Browse the AI model directoryCompare context windows and tokenizer notes for the models we track.Open the full AI Token CounterCount tokens for your own prompt in the browser. Nothing is uploaded.
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