---
title: "Claude Token Counter for Opus, Sonnet & Haiku"
description: "Free Claude token counter for Claude Opus, Sonnet, and Haiku. Estimate tokens, cost, and context usage in your browser. Nothing uploaded, no sign-up."
canonical: https://holaclaw.ai/tools/token-counter/claude
---

# Claude Token Counter

Estimate tokens and cost for Claude Opus, Sonnet, and Haiku. The tokenizer runs in your browser and your text never leaves it.

Use it at [holaclaw.ai/tools/token-counter/claude](https://holaclaw.ai/tools/token-counter/claude).

## Counting tokens for Claude models

**Anthropic does not publish a tokenizer for current Claude models, so this page gives a close approximation rather than an exact count.** Opus, Sonnet, and Haiku load together and share the same estimate; what changes between them is the price and the context window. When you need the official number (a hard context limit, a billing check), Anthropic's API has a token counting endpoint that returns it without running the model.

## Pricing and context windows

Anthropic's list prices per million input tokens, with the context window of each tier.

| Model | Tokenizer | Price / 1M input | Context window |
| --- | --- | --- | --- |
| Claude Opus | claude-v4 * | $5.00 | 1M |
| Claude Sonnet | claude-v4 * | $3.00 | 1M |
| Claude Haiku | claude-v4 * | $1.00 | 200K |

Marked as an estimate: Anthropic does not publish the tokenizer for these models, so the count is a close approximation. Prices and context windows are curated metadata refreshed periodically from the providers and OpenRouter, so treat them as guidance rather than a quote. Token counts are always produced by the real tokenizer.

## How Claude tokenization works

**All three Claude tiers are treated as a single tokenizer family here.** Anthropic exposes token counts through its API but not the vocabulary behind them, so this tool uses a community byte-level BPE vocabulary of about 151,000 entries as a stand-in. On English prose it lands close to Anthropic's own count; code, other languages, and unusual formatting widen the gap.

Because the three tiers share the estimate, the compare table shows one token count against three prices: the quickest way to see what a prompt would cost on each tier.

## Frequently asked questions

### Is there an official Claude tokenizer?

**No. Anthropic has not published the vocabulary behind current Claude models.** The count here is an approximation and the tool labels it as an estimate. For exact numbers, Anthropic's API provides a token counting endpoint that returns the official count for a request.

### How accurate is this Claude token count?

**Close on English prose, less so on code and non-English text.** The stand-in vocabulary splits ordinary English much the way Anthropic's does, so planning figures hold up well. Treat it as guidance rather than a billing figure, and verify anything sitting near a context-window boundary.

### Do Opus, Sonnet, and Haiku count tokens differently?

**No. The same text is the same number of tokens on all three.** Price and context window are what differ: Opus and Sonnet take up to 1M tokens, Haiku 200K. The compare table shows the shared count next to each tier's cost.

### Does the count include the system prompt?

**No, it counts only the text in the box.** A real Claude request also carries your system prompt, any tool definitions, and the conversation so far, all billed as input. Count those separately and add them when you budget a call.

## Token counters for other models

- [Compare all model families on the full token counter](/tools/token-counter.md)
- [OpenAI Token Counter](/tools/token-counter/openai.md)
- [Gemini Token Counter](/tools/token-counter/gemini.md)
- [DeepSeek Token Counter](/tools/token-counter/deepseek.md)
- [Qwen Token Counter](/tools/token-counter/qwen.md)
- [Mistral Token Counter](/tools/token-counter/mistral.md)
- [Grok Token Counter](/tools/token-counter/grok.md)
- [Muse Glimmer Token Counter](/tools/token-counter/muse-glimmer.md)