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GPT-4o Mini vs Gemini 1.5 Flash API Token Cost Calculator for RAG Pipeline

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 RAG Pipeline.

Requests / Day5,000
Input Tokens / Req4,500
Output Tokens / Req600
Prompt Cache Hit %60%
GPT-4o Mini (OpenAI)128K Context
Estimated Monthly API Spend
$124.88/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
$54.54/mo
Input / Cached (1M):$0.07 / $0.018
Output (1M):$0.30
Avg Speed:~190 tok/s
Cost Winner for RAG Pipeline: Gemini 1.5 Flash saves $70.34/month ($844/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 RAG Pipeline 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 5,000 requests/day (675.0M monthly input tokens and 90.0M monthly output tokens with a 60% cache hit rate), GPT-4o Mini costs $124.88/month whereas Gemini 1.5 Flash costs $54.54/monthโ€”a monthly variance of $70.34 ($844/year).

Frequently Asked Questions

Is GPT-4o Mini or Gemini 1.5 Flash cheaper for RAG Pipeline?

Under standard RAG Pipeline parameters (5,000 reqs/day, 4500 input tokens, 600 output tokens, 60% cache hit), Gemini 1.5 Flash is more cost-effective, saving $70.34 per month ($844.02 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 RAG Pipeline 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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