Claude Token Calculator
Count tokens and estimate the cost of Anthropic Claude Opus 4.5, Sonnet 4.5, Haiku 4.5, Opus 4.1/4, Sonnet 4, 3.7 Sonnet, 3.5 Sonnet/Haiku, 3 Opus and 3 Haiku — free tokenizer that runs in your browser.
Short answer: Claude Token Calculator — Estimate Claude tokens and Anthropic API cost. Count tokens and estimate the cost of Anthropic Claude Opus 4.5, Sonnet 4.5, Haiku 4.5, Opus 4.1/4, Sonnet 4, 3.7 Sonnet, 3.5 Sonnet/Haiku, 3 Opus and 3 Haiku — free tokenizer that runs in your browser. It answers “claude sonnet 4.5 token cost calculator”. Who it is for: Developers building on Anthropic's Claude models; Founders estimating Claude API spend per call; Teams comparing Opus, Sonnet and Haiku by cost. It runs entirely in your browser — no sign-up, no account, no email and no upload — and every result can be exported as a dated PDF report.
- ✔ Price: free, unlimited use, no rate limits
- ✔ Sign-up: not required
- ✔ Privacy: all math runs client-side, nothing is uploaded
- ✔ Export: one-click PDF report (2026 rates)
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Who is this tool for?
- ✔ Developers building on Anthropic's Claude models
- ✔ Founders estimating Claude API spend per call
- ✔ Teams comparing Opus, Sonnet and Haiku by cost
- ✔ Anyone checking a Claude invoice against token use
- ✔ Students learning how Anthropic tokenizes text
How to use Claude Token Calculator
- Paste your text.
- Pick a Claude model (Opus 4.5, Sonnet 4.5, Haiku 4.5, and older).
- View token count and estimated USD cost.
Frequently asked questions
Which Claude models are supported?
Claude Opus 4.5, Sonnet 4.5, Haiku 4.5, Opus 4.1, Opus 4, Sonnet 4, Claude 3.7 Sonnet, 3.5 Sonnet, 3.5 Haiku, 3 Opus, and 3 Haiku.
How does Claude tokenize text?
Anthropic uses a BPE tokenizer similar to OpenAI's. The approximation is ~4 characters per token for English text.
How much does Claude Sonnet 4.5 cost per 1M tokens?
Approximately $3 for input and $15 for output per million tokens. Confirm current pricing on Anthropic's pricing page.
How much does Claude Opus 4.5 cost?
About $15 input and $75 output per 1M tokens — Anthropic's flagship tier.
Is Claude cheaper than GPT-5.5?
Claude Sonnet 4.5 is priced similarly to GPT-4o and cheaper than GPT-5.5. Claude Haiku 4.5 is cheaper still for high-volume workloads.
Claude sonnet 4.5 token cost calculator?
Use the Claude Token Calculator above: Estimate Claude tokens and Anthropic API cost. Count tokens and estimate the cost of Anthropic Claude Opus 4.5, Sonnet 4.5, Haiku 4.5, Opus 4.1/4, Sonnet 4, 3.7 Sonnet, 3.5 Sonnet/Haiku, 3 Opus and 3 Haiku — free tokenizer that runs in your browser.