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Calcis: LLM Cost Estimator sɣur Ryan Chen

See what your LLM prompt will cost before you send it. Works on ChatGPT, Claude, and Gemini.

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See the cost before you hit send.
Live estimate updates as you type, auto-detected GPT-5, no setup.

Same panel on Claude. And Gemini. And ChatGPT.
Switch models or sites. The overlay follows, costs recalculate.

Catches the expensive ones early.
2,400-token prompt? You'll know what it costs before it costs you.

One click for the full breakdown.
Input, output, total, model, effort. Every number, no guesswork.

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Calcis shows you what an LLM API call will cost before you send it: right inside ChatGPT, Claude, and Gemini.

As you type a prompt, Calcis estimates the token count, predicts the output length, and shows the total cost in a small overlay near the input box. The estimate updates live as you type.

Features:
- Auto-detects which model you have selected
- Auto-detects effort/reasoning level
- Shows input tokens, predicted output tokens, and cost
- Shows cost at 1,000 requests/month for at-scale planning
- Works on chat.openai.com, chatgpt.com, claude.ai, gemini.google.com
- Non-intrusive overlay that can be collapsed or dismissed
- Your prompts are never stored or logged by the extension

Setup:
1. Get an API key at calcis.dev/dashboard
2. Click the Calcis extension icon and enter your API key
3. Open ChatGPT, Claude, or Gemini and start typing

Powered by the same estimation engine as calcis.dev.

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