ANTHROPIC MODEL TOKEN COUNTER

Claude Sonnet 4.5 Token Counter

Count tokens for Claude Sonnet 4.5 and estimate API cost before you send a request. Anthropic does not publish this tokenizer, so counts are calibrated estimates for planning. Your text never leaves the browser.

PROMPT

Paste text to count Claude Sonnet 4.5 tokens.

Expected output

Tokens

Words

Characters

Input cost

$0.00

Output cost

$0.00

Total request

$0.00

200,000 token context window 0%

Need optimization suggestions, a token heatmap, monthly cost projection, or a side-by-side model comparison? Open the full analyzer with Claude Sonnet 4.5 preselected.

Claude Sonnet 4.5 at a glance

Provider. Anthropic

Context window. 200,000 tokens (about 150,000 English words).

API pricing. $3.00 input / $15.00 output per 1M tokens.

Tokenizer. Not public; counts on this page are calibrated estimates.

Pricing source. Official Anthropic pricing page, checked 2026-07-01. Prices in the catalog were last refreshed 2026-07-01 and are estimates, not quotes.

Other Anthropic model token counters

Claude Opus 4.8 Claude Sonnet 4.6 Claude Haiku 4.5 claude-3-7-sonnet-20250219 claude-3-haiku-20240307 claude-3-opus-20240229 claude-4-opus-20250514 claude-4-sonnet-20250514 claude-fable-5 claude-haiku-4-5-20251001 claude-opus-4-1 claude-opus-4-1-20250805 claude-opus-4-20250514 claude-opus-4-5 claude-opus-4-5-20251101

See the Claude Token Counter for all Anthropic models in one counter. Or browse the full model token counter directory and the LLM pricing comparison table to see how Claude Sonnet 4.5 prices against other providers.

FAQ

Claude Sonnet 4.5 token counter FAQ

How do I count tokens for Claude Sonnet 4.5?

Paste your prompt into the counter on this page. Anthropic does not publish the Claude Sonnet 4.5 tokenizer, so the count is a calibrated estimate based on text length, language, and structure. Treat it as planning guidance rather than an exact billing number.

How much does Claude Sonnet 4.5 cost per token?

Claude Sonnet 4.5 costs $3.00 per 1 million input tokens and $15.00 per 1 million output tokens, based on official Anthropic pricing checked 2026-07-01.

What is the context window of Claude Sonnet 4.5?

Claude Sonnet 4.5 has a context window of 200,000 tokens, which is roughly 150,000 English words of combined prompt and response. The counter above shows how much of that window your text consumes.

Is this Claude Sonnet 4.5 token count exact?

No. It is a clearly labeled estimate, because Anthropic has not released a public tokenizer for Claude Sonnet 4.5. Estimates are usually within a reasonable range for English text but can drift for code, JSON, or non-English languages.