Claude Cost Calc vs
OpenAI Tokenizer
OpenAI Tokenizer is great for visualizing how GPT models split text into tokens. Claude Cost Calc goes further: it counts tokens AND prices them across Claude Opus / Sonnet / Haiku with cache-discount math, so you see real dollar amounts.
Try Claude Cost Calc (Free) →Claude Cost Calc vs OpenAI Tokenizer — Feature Comparison
| Feature | Claude Cost Calc | OpenAI Tokenizer |
|---|---|---|
| Counts tokens for OpenAI models | No (use OpenAI Tokenizer for that) | Yes — its only job |
| Counts tokens for Claude models | Yes — Opus, Sonnet, Haiku | No |
| Returns dollar cost, not just token count | Yes | No — counts only |
| Cache-discount math | Yes — separate input / cache write / cache read | N/A |
| Multi-message session input | Yes — full session log .jsonl | No — single text box |
| Visual token highlighting | No | Yes — colored token blocks |
| Free, no signup | Yes | Yes |
| Breakdown by model / hour / tool | Yes | No |
Pick Claude Cost Calc when…
You are working with Claude (not GPT) and care about dollars, not just token counts. The calculator handles cache writes/reads separately, supports paste-in session logs, and gives a per-model cost breakdown — the kind of answer OpenAI Tokenizer is not built for.
Pick OpenAI Tokenizer when…
You want to see exactly how the OpenAI GPT-4 / GPT-4o tokenizer splits a string into BPE pieces. The colored visualization is the gold standard for teaching tokenization, and it covers every current OpenAI model.
Ready to try Claude Cost Calc?
Token counts plus actual dollar cost across Claude models — not just OpenAI. Free, no signup, runs in your browser.
Open Claude Cost Calc →Or visit OpenAI Tokenizer if you prefer their workflow.
Frequently Asked Questions
Which is better for estimating Claude API costs — Claude Cost Calc or OpenAI Tokenizer?
Claude Cost Calc. OpenAI Tokenizer counts tokens for GPT models only — not Claude — and stops at token counts. Claude Cost Calc uses the Claude tokenizer rules and multiplies by current Anthropic per-million-token prices to give you a dollar figure.
Is OpenAI Tokenizer free?
Yes — the OpenAI Tokenizer at platform.openai.com/tokenizer is free and does not require an account.
When should I use OpenAI Tokenizer?
When you're working with OpenAI's GPT-4, GPT-4o, or o-series models and want to see exactly how a piece of text is split into tokens. It's also the best teaching tool for understanding BPE tokenization.
Does the Claude tokenizer count tokens the same way as OpenAI?
No. Anthropic and OpenAI use different tokenizers, so the same text can produce different token counts. Always use a Claude-specific calculator when pricing Anthropic API usage.
Can Claude Cost Calc tokenize arbitrary text, or only session logs?
Both. Paste raw text to get a token count + cost estimate, or paste a Claude Code session log (.jsonl) to get a full per-model breakdown.