AI LLM API Token Cost Calculator (Gemini vs. GPT-4o vs. Claude)

Benchmark monthly API spend across top frontier and lightweight models with prompt caching and hybrid routing savings.

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Result
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Projected Monthly API Cost by Daily Request Volume

Source: Official developer pricing per 1M tokens (Gemini 2.5 Flash In $0.30/Out $2.50, GPT-4o-mini In $0.15/Out $0.60, Claude 3.5 Sonnet In $3.00/Out $15.00; Pricing date: 2026-11-09)
As of: November 2026

500 calls / day (34.5M tokens)Gemini $35.23 / GPT-4o-mini $9.82
1,000 calls / day (69.0M tokens)Gemini $70.46 / GPT-4o-mini $19.63
3,000 calls / day (207.0M tokens)Gemini $211.39 / GPT-4o-mini $58.89
10,000 calls / day (690.0M tokens)Gemini $704.62 / GPT-4o-mini $196.31

Model Cascading: How to Cut AI SaaS Bills by 85%

Routing 85% of high-volume tasks (classification, extraction, first-draft generation) to ultra-efficient models like Gemini Flash or GPT-4o-mini while reserving frontier reasoning models for complex synthesis keeps gross margins above 80%.

Prompt Caching & Batch API Optimization

Placing static system instructions and few-shot examples at the beginning of your prompt enables 50%–90% discounts on cached input tokens. Combining this with asynchronous Batch APIs cuts non-urgent pipeline costs in half.

FAQ

How many words is 1,000 tokens in English?
In English, 1,000 tokens roughly equals 750 words or about 4,000 characters.
Why are output tokens 3x to 5x more expensive than input tokens?
Output generation is memory-bandwidth bound because each token must be generated sequentially, whereas input tokens are processed in parallel during the prefill phase.
Which model offers the best price-to-performance for automation?
Gemini Flash and GPT-4o-mini deliver near-frontier accuracy on structured JSON extraction and summarization at less than 1/15th the cost of flagship models.

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