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GPT-4o Mini vs Gemini 1.5 Flash API Token Cost Calculator for Customer Support Agent

Calculate and compare monthly API token costs, prompt caching savings, and latency between GPT-4o Mini ($0.15/1M in) and Gemini 1.5 Flash ($0.075/1M in) for Customer Support Agent.

Requests / Day10,000
Input Tokens / Req1,800
Output Tokens / Req400
Prompt Cache Hit %50%
GPT-4o Mini (OpenAI)128K Context
Estimated Monthly API Spend
$132.75/mo
Input / Cached (1M):$0.15 / $0.075
Output (1M):$0.60
Avg Speed:~165 tok/s
Gemini 1.5 Flash (Google)1M Context
Estimated Monthly API Spend
$61.11/mo
Input / Cached (1M):$0.07 / $0.018
Output (1M):$0.30
Avg Speed:~190 tok/s
Cost Winner for Customer Support Agent: Gemini 1.5 Flash saves $71.64/month ($860/year) at current token volume.
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GPT-4o Mini vs Gemini 1.5 Flash API Cost & Architecture Guide

Selecting between GPT-4o Mini (OpenAI) and Gemini 1.5 Flash (Google) for production Customer Support Agent workloads requires balancing token pricing, prompt caching discounts, context window capacity (128K vs 1M), and streaming throughput (165 vs 190 tok/s).

GPT-4o Mini is priced at $0.15 per 1M input tokens ($0.075/1M with prompt caching) and $0.60 per 1M output tokens. By comparison, Gemini 1.5 Flash charges $0.07 per 1M input tokens ($0.018/1M cached) and $0.30 per 1M output tokens.

At 10,000 requests/day (540.0M monthly input tokens and 120.0M monthly output tokens with a 50% cache hit rate), GPT-4o Mini costs $132.75/month whereas Gemini 1.5 Flash costs $61.11/monthโ€”a monthly variance of $71.64 ($860/year).

Frequently Asked Questions

Is GPT-4o Mini or Gemini 1.5 Flash cheaper for Customer Support Agent?

Under standard Customer Support Agent parameters (10,000 reqs/day, 1800 input tokens, 400 output tokens, 50% cache hit), Gemini 1.5 Flash is more cost-effective, saving $71.64 per month ($859.68 annually).

How does prompt caching affect GPT-4o Mini vs Gemini 1.5 Flash pricing?

GPT-4o Mini reduces cached input costs to $0.075/1M tokens, while Gemini 1.5 Flash charges $0.018/1M cached input tokens. High system-prompt reuse in Customer Support Agent pipelines can cut total input token spend by 50%โ€“90%.

What are the context window and speed differences between GPT-4o Mini and Gemini 1.5 Flash?

GPT-4o Mini supports a 128K token context window at ~165 tokens/sec, while Gemini 1.5 Flash provides a 1M token context window at ~190 tokens/sec.

Disclaimer: API prices and tokenizer rules are subject to change by the respective providers.

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