🧠 Claude Context Window Cost Planner

Multi‑turn cost modeling · Haiku · Sonnet · Opus · Caching · Sliding window

⚙️ Parameters

⏳ Full history
Sliding window N=10

💰 Monthly cost estimate

Input tokens—
Output tokens—
Haiku—
Sonnet 4—
Opus 4—
Cached savings (90%)—
⚡ Breakeven: —

📈 Cost per conversation (Haiku)

Input cost grows super‑linearly with turns (full history).

🪟 Sliding window optimization

Monthly cost (Haiku) at window sizes 5, 10, 20 vs full history.

📦 Prompt caching calculator

Assuming 90% context cached → input cost = 10% of original.

Monthly input (no cache): — With caching: — Savings: —

⚖️ Breakeven: Haiku → Sonnet

At what daily volume does Sonnet cost justify? (cost difference vs quality)

Adjust parameters to see breakeven volume.

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