LLM Tools
LLM Tools
Estimate token counts for any text with per-model cost breakdowns across OpenAI, Anthropic, Google, and more. Build multi-turn chat conversations and export as ready-to-run API request JSON for OpenAI, Anthropic, or Gemini. Visually build function/tool-calling JSON schemas for OpenAI or Anthropic tool use.
cl100k_base and o200k_base give the exact token count OpenAI's own API would report for that encoding. Non-OpenAI models (Anthropic, Google, Meta, Mistral) use their own tokenizers, so treat counts for those rows as a reasonable approximation rather than an exact match.
LLM Tools
Estimate token counts for any text with per-model cost breakdowns across OpenAI, Anthropic, Google, and more. Build multi-turn chat conversations and export as ready-to-run API request JSON for OpenAI, Anthropic, or Gemini. Visually build function/tool-calling JSON schemas for OpenAI or Anthropic tool use.
Common uses
- Estimate token count for a system prompt
- Compare GPT-4o vs Claude cost for a document
- Build a multi-turn conversation and export as OpenAI JSON
- Convert a chat to Anthropic Messages API format
- Build a function-calling JSON schema for an OpenAI tool
- Generate an Anthropic tool_use input schema
Frequently asked questions
Can I use LLM Tools to estimate token count for a system prompt?
Yes. LLM Tools can estimate token count for a system prompt, directly in your browser.
Can I use LLM Tools to compare GPT-4o vs Claude cost for a document?
Yes. LLM Tools can compare GPT-4o vs Claude cost for a document, directly in your browser.
Can I use LLM Tools to build a multi-turn conversation and export as OpenAI JSON?
Yes. LLM Tools can build a multi-turn conversation and export as OpenAI JSON, directly in your browser.
Is my data uploaded to a server?
No. This tool runs entirely in your browser — your input is processed locally on your device and is never uploaded or stored on a server.