Price comparison · checked October 12, 2026

GPT-6.1 Sol vs GPT-6 Luna pricing

For a typical support chatbot (60,000 conversations a month), GPT-6 Luna costs $18.00 a month and GPT-6.1 Sol costs $360. That makes GPT-6 Luna 20× cheaper for this workload.

GPT-6.1 SolGPT-6 Luna
ProviderOpenAIOpenAI
Input / 1M$2.00$0.10
Cached input / 1M$0.10$0.010
Output / 1M$10.00$0.50
Context window1.05M1.05M
NotesShort-context rateShort-context rate

Monthly cost by workload

WorkloadGPT-6.1 SolGPT-6 LunaDifference
Support chatbot
60,000 req · 1,500 in / 300 out
$360$18.00GPT-6 Luna 20× cheaper
Document summaries
20,000 req · 6,000 in / 400 out
$320$16.00GPT-6 Luna 20× cheaper
Coding assistant
30,000 req · 4,000 in / 800 out
$480$24.00GPT-6 Luna 20× cheaper
RAG search
100,000 req · 2,500 in / 250 out
$750$37.50GPT-6 Luna 20× cheaper

Standard rates, no caching or batch discounts. Sources: 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
GPT-6.1 Sol
OpenAI
$360 /mo

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