Price comparison · checked October 12, 2026

GPT-6 Luna vs Gemini 3.5 Flash-Lite pricing

For a typical support chatbot (60,000 conversations a month), GPT-6 Luna costs $18.00 a month and Gemini 3.5 Flash-Lite costs $72.00. That makes GPT-6 Luna 4.0× cheaper for this workload.

GPT-6 LunaGemini 3.5 Flash-Lite
ProviderOpenAIGoogle
Input / 1M$0.10$0.30
Cached input / 1M$0.010–
Output / 1M$0.50$2.50
Context window1.05M1M
NotesShort-context rate–

Monthly cost by workload

WorkloadGPT-6 LunaGemini 3.5 Flash-LiteDifference
Support chatbot
60,000 req · 1,500 in / 300 out
$18.00$72.00GPT-6 Luna 4.0× cheaper
Document summaries
20,000 req · 6,000 in / 400 out
$16.00$56.00GPT-6 Luna 3.5× cheaper
Coding assistant
30,000 req · 4,000 in / 800 out
$24.00$96.00GPT-6 Luna 4.0× cheaper
RAG search
100,000 req · 2,500 in / 250 out
$37.50$138GPT-6 Luna 3.7× cheaper

Standard rates, no caching or batch discounts. Sources: ai.google.dev · developers.openai.com

Try your own numbers

Start from a use case

1,000 tokens is about 750 English words. Input includes your system prompt, chat history and any retrieved documents.

GPT-6 Luna
OpenAICheapest
$18.00 /mo
Gemini 3.5 Flash-Lite
Google
$72.00 /mo

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