AI Token Counter & LLM Cost Calculator
Estimate tokens, context window usage, and API pricing for GPT-6 Astra, Claude Opus 5, Claude Sonnet 5, GPT-5.6 Sol, Gemini 3.8 Flash, and DeepSeek-V4-Pro.
Model Context Window
Cross-Model Cost Comparison
Overview
Free online AI token counter with BPE subword heuristics. Calculate word, character, and token counts with instant multi-model API cost projections for GPT-6 Astra, Claude Opus 5, Claude Sonnet 5, GPT-5.6 Sol, Gemini 3.8 Flash, Grok 4.6, and DeepSeek-V4-Pro in USD, EUR, and TRY.
LLM Tokenization and API Pricing Handbook
Large Language Models do not parse raw words; they break text into byte-pair encoded subwords (BPE chunks).
English text averages ~1.3 tokens per word, whereas technical code blocks, non-ASCII characters, and JSON payloads require more tokens.
Our token calculator measures tokens, evaluates context window limits, and compares pricing across top frontier models including GPT-6 Astra, Claude Opus 5, Claude Sonnet 5, GPT-5.6 Sol, Gemini 3.8 Flash, Grok 4.6, DeepSeek-V4-Pro, and Kimi K3 in USD, EUR, and TRY.
How to Calculate Tokens and API Expenses
Fast & IntuitiveInput Your Text or Code
Paste your prompt, article, or programming source code into the editor.
Select Desired LLM
Choose between Gemini 3.8, Claude 5.0, Claude 4.8, GPT-5, o3, or DeepSeek.
Compare Costs in Real Time
Inspect the live cost projections in USD, EUR, or TRY with context window utilization.
Key Highlights & Advantages
Zero server uploads. Everything processes securely within your local browser memory.
Immediate results with no file upload or download queues.
No registration, no paywalls, and no hidden quotas.
Seamlessly optimized for mobile smartphones, tablets, and desktop workstations.
All data processing runs natively via W3C compliant browser hardware acceleration.
- Minifying JSON payloads before passing them to LLMs reduces prompt token costs by up to 35%.
- Monitor context window utilization to avoid degradation in model attention and recall.
Frequently Asked Questions
2 Q&AsWhat is a token in large language models?
Tokens are the basic building blocks of text processed by LLMs, representing ~4 characters or 0.75 words in standard English.
Is my data secure?
Completely. All tokenization runs in-browser with zero remote API transmission.