AI Token Counter
Count tokens for GPT-4, Claude, Gemini — with cost estimates
Tokens for GPT-4o
0
0 characters 0 words 0 tokens/word
💰 Cost estimate
As input (this text sent to AI)$0.000
As output (AI generates this length)$0.000
1,000 runs as input$0.00
Context window usage 0 / 0
Free GPT / Claude / Gemini token counter with cost estimates
Toololis AI Token Counter counts tokens for every major AI model: GPT-4o, GPT-4, GPT-3.5, Claude 3 Opus/Sonnet/Haiku, Gemini Pro/Flash. Live cost estimates for input and output tokens. 100% client-side — your prompts never leave your browser.
How to use this tool
- 1
Paste your text or prompt
Any text — prompts, documents, code, JSON payloads.
- 2
Pick the AI model
GPT-4, GPT-3.5, Claude 3, Gemini — each uses different tokenizers.
- 3
Read token count + cost
Live token count for the chosen model, plus estimated input/output API costs.
Token rules of thumb
- English: ~1 token per 0.75 words (~4 characters per token)
- Code: more tokens per character due to special symbols
- Non-English: ~1.5-3× more tokens (especially CJK languages)
- JSON: 20-40% overhead from brackets and quotes
- Numbers: each digit is often a token
Current API pricing (2026, per 1M tokens)
| Model | Input | Output | Context |
|---|---|---|---|
| GPT-4o | $2.50 | $10.00 | 128K |
| GPT-4 Turbo | $10.00 | $30.00 | 128K |
| GPT-3.5 Turbo | $0.50 | $1.50 | 16K |
| Claude 3 Opus | $15.00 | $75.00 | 200K |
| Claude 3.5 Sonnet | $3.00 | $15.00 | 200K |
| Claude 3 Haiku | $0.25 | $1.25 | 200K |
| Gemini 1.5 Pro | $1.25 | $5.00 | 1M+ |
| Gemini 1.5 Flash | $0.075 | $0.30 | 1M |
Prices are reference as of our . Always verify on the provider's official pricing page before budgeting.
Frequently Asked Questions
What is a token?
A token is a chunk of text the AI model processes. Roughly 1 token = 0.75 words in English. The word "Understanding" might be 1 token; "Unbelievability" might be 3 tokens. Tokens are fundamental to AI pricing and context limits.
Why do different models count differently?
Each model uses a different tokenizer. GPT-4 uses
cl100k_base. GPT-3.5 and embeddings use similar. Claude uses its own tokenizer (similar counts, slightly different). Gemini uses Google's SentencePiece-based tokenizer (~1.3× GPT counts on average).Is this 100% accurate for GPT?
Yes — we use the official
gpt-tokenizer library that mirrors OpenAI's cl100k_base encoding. Matches tokens exactly.Is Claude count accurate?
Approximate. Anthropic doesn't publish their tokenizer. Our Claude estimate is ~±5% accurate based on published characteristics. For exact Claude costs, use Anthropic's official
count_tokens API endpoint.Why are my prompts expensive?
Common mistake: sending full conversation history each turn. If you send a 5,000-token context + 500-token query 10 times = 55,000 tokens input billed. Reduce by summarizing history periodically.
Is my text uploaded?
No. Tokenization runs in your browser. Your prompts, code, or proprietary content never leave your device.
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100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.