AI Cost Calculator (GPT-5, Claude, Gemini, Perplexity)

Estimate your monthly API spend across all major models. Calibrated to 2026 pricing. Browser-only — your inputs never leave this page.

Your usage

Anthropic prompt-cache reduces input cost ~90% on hit

Pricing notes: Rates are 2026 published API prices. Actual cost varies with batch API discounts (50%), volume tier discounts, fine-tuned models, and provisioned throughput. Use this as a planning estimate, not a billing prediction.

How to reduce AI cost

  • Use prompt caching. Anthropic + OpenAI both support cached system prompts. Cache hit = 90% off input tokens. Biggest single lever.
  • Right-size the model. Sonnet 4.5 is 5× cheaper than Opus and handles 80% of tasks. GPT-5 Mini is 20× cheaper than GPT-5.
  • Batch API for non-realtime. 50% discount on Anthropic Message Batches API and OpenAI Batch API. If your task can wait 24h, batch.
  • Trim the system prompt. Audit your system prompt for repetition + dead instructions. ~30% trim is usually achievable.
  • Limit max-tokens. If your typical output is 500 tokens, don't allow 4000. Cap explicitly.

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