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GPT-4o Mini vs Gemini 1.5 Flash API Token Cost Calculator for Code Generation & Review

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 Code Generation & Review.

Requests / Day2,500
Input Tokens / Req5,000
Output Tokens / Req1,500
Prompt Cache Hit %55%
GPT-4o Mini (OpenAI)128K Context
Estimated Monthly API Spend
$108.28/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
$50.12/mo
Input / Cached (1M):$0.07 / $0.018
Output (1M):$0.30
Avg Speed:~190 tok/s
Cost Winner for Code Generation & Review: Gemini 1.5 Flash saves $58.16/month ($698/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 Code Generation & Review 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 2,500 requests/day (375.0M monthly input tokens and 112.5M monthly output tokens with a 55% cache hit rate), GPT-4o Mini costs $108.28/month whereas Gemini 1.5 Flash costs $50.12/monthโ€”a monthly variance of $58.16 ($698/year).

Frequently Asked Questions

Is GPT-4o Mini or Gemini 1.5 Flash cheaper for Code Generation & Review?

Under standard Code Generation & Review parameters (2,500 reqs/day, 5000 input tokens, 1500 output tokens, 55% cache hit), Gemini 1.5 Flash is more cost-effective, saving $58.16 per month ($697.95 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 Code Generation & Review 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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