Price comparison · checked October 12, 2026

GPT-6 Luna vs DeepSeek V4.1 Flash pricing

For a typical support chatbot (60,000 conversations a month), GPT-6 Luna costs $18.00 a month and DeepSeek V4.1 Flash costs $24.30. That makes GPT-6 Luna 1.4× cheaper for this workload.

GPT-6 LunaDeepSeek V4.1 Flash
ProviderOpenAIDeepSeek
Input / 1M$0.10$0.15
Cached input / 1M$0.010$0.003
Output / 1M$0.50$0.60
Context window1.05M1M
NotesShort-context rateOff-peak rate. Peak hours cost 2×

Monthly cost by workload

WorkloadGPT-6 LunaDeepSeek V4.1 FlashDifference
Support chatbot
60,000 req · 1,500 in / 300 out
$18.00$24.30GPT-6 Luna 1.4× cheaper
Document summaries
20,000 req · 6,000 in / 400 out
$16.00$22.80GPT-6 Luna 1.4× cheaper
Coding assistant
30,000 req · 4,000 in / 800 out
$24.00$32.40GPT-6 Luna 1.3× cheaper
RAG search
100,000 req · 2,500 in / 250 out
$37.50$52.50GPT-6 Luna 1.4× cheaper

Standard rates, no caching or batch discounts. Sources: api-docs.deepseek.com · 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
DeepSeek V4.1 Flash
DeepSeek
$24.30 /mo

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