Diff & Cost Estimate
Compare your original prompt with an optimized version side-by-side. Visualize exact text diffs, compute token reductions, and calculate dollar savings across OpenAI, Anthropic, and Gemini.
Why Visual Diffing and Token Cost Estimation are Critical
In modern AI product development, prompt engineering is an iterative software discipline. When tweaking system instructions or compressing few-shot examples, engineers and prompt designers need to know two things immediately: what exact words changed, and how much money and latency was saved.
Diff & Cost Estimate provides side-by-side visual diffing (green additions, red removals) alongside instant financial cost projections. Whether you are optimizing a prompt for personal ChatGPT use or scaling an enterprise AI agent to millions of monthly API calls, this tool gives you complete clarity into your token economics.
3 Core Metrics Evaluated in the Diff Report
Token Compression Delta
Computes exact BPE token counts before and after optimization, highlighting net token savings and percentage reductions.
Multi-Model Cost Projections
Calculates real dollar savings across OpenAI GPT-4o, Anthropic Claude Sonnet 5, Google Gemini 3.6 Flash, and DeepSeek.
Latency & TTFT Speedup
Reducing prompt size accelerates Time-To-First-Token (TTFT) by reducing prefill compute overhead on inference servers.
Estimated Monthly Savings by Model Tier (100k API Calls)
Input-token savings only, based on published pricing as of September 2026 — use the live calculator above for your own prompt, output length, and volume.
| Frontier LLM Model | Original Cost (1,500 Tok) | Optimized Cost (750 Tok) | Monthly Net Savings |
|---|---|---|---|
| OpenAI GPT-4o | $375.00 | $187.50 | +$187.50 / mo |
| Anthropic Claude Sonnet 5 | $300.00 | $150.00 | +$150.00 / mo |
| Google Gemini 3.6 Flash | $112.50 | $56.25 | +$56.25 / mo |
| OpenAI GPT-4o mini | $22.50 | $11.25 | +$11.25 / mo |