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GPT-5.6 Luna API pricing

As of October 16, 2026, GPT-5.6 Luna costs $0.20 per million input tokens and $1.20 per million output tokens on the OpenAI API. Cached input is $0.02 per million.

It is the 5th cheapest of 36 OpenAI models tracked here, by blended price. The closest Budget-tier model from another provider is Codestral (Mistral) at $0.30 / $0.90; GPT-5.6 Luna is 0% more expensive. First listed in the LiteLLM price data on July 9, 2026. Its price has been cut 1 time and raised 0 times since. Prompts longer than 272K tokens are billed at $0.40 input / $1.80 output.

Input / 1M tokens$0.20
Output / 1M tokens$1.20
Context window922K
Max output128K

Every published rate

RatePer 1M tokens
Input (standard)$0.20
Output (standard)$1.20
Cached input (read)$0.02
Cache write$0.25
Batch input$0.10
Batch output$0.60
Input, prompts over 272K tokens$0.40
Output, prompts over 272K tokens$1.80

What it costs in practice

TaskTokensPer requestPer 1,000 requests
Chatbot reply1,000 in / 500 out$0.0008$0.80
Summarize a long document20,000 in / 1,000 out$0.0052$5.20
Coding agent step50,000 in / 2,000 out$0.01$12.40

Standard rates, no caching or batch discount; prompts over 272K tokens are billed at the higher long-prompt rate. Compare your own numbers across all models →

Price history

$6.00 $0 2026-07-092026-10-16
Per 1M tokens. ━ Output · ┅ Input
DateModelChange
2026-08-20GPT-5.6 LunaContext window: 1.05M → 922K (-12%) source
2026-07-30GPT-5.6 LunaOutput price: $6.00 → $1.20 (-80%) source
2026-07-30GPT-5.6 LunaInput price: $1.00 → $0.20 (-80%) source
2026-07-09GPT-5.6 LunaNew model listed: $1 in / $6 out source

Dates are when each change first appeared in the LiteLLM price data, usually within days of the provider's announcement.

Details

ProviderOpenAI
Price tierBudget
FeaturesVision, Reasoning, Prompt caching, Tool use, PDF input, Web search
API model namesgpt-5.6-luna
Official pricingdevelopers.openai.com

Models at a similar price

ModelInput / 1MOutput / 1M
DeepSeek V3.2$0.28$0.40
Codestral$0.30$0.90
GPT-5.4 Nano$0.20$1.25
DeepSeek V3$0.27$1.10
DeepSeek V4 Flash$0.30$1.20
Gemini 3.1 Flash Lite$0.25$1.50

Other OpenAI models

ModelInput / 1MOutput / 1M
GPT-4$30.00$60.00
GPT-5.6 Cyber$12.50$75.00
GPT-5.5 Cyber$12.50$75.00
o1$15.00$60.00
GPT-6 Astra$10.00$50.00
GPT-4 Preview$10.00$30.00
GPT-4 Turbo$10.00$30.00
GPT-5.5$5.00$30.00
GPT-Rosalind Research$5.00$25.00
GPT-Rosalind Discovery$5.00$25.00
GPT-5.6$4.00$20.00
GPT-5.6 Sol$4.00$20.00
GPT-5.4$2.50$15.00
GPT-5.2$1.75$14.00
GPT-5.6 Terra$2.00$12.00
GPT-4o$2.50$10.00
GPT-6 Sol$2.00$10.00
GPT-6.1 Sol$2.00$10.00
GPT-4.1$2.00$8.00
o3$2.00$8.00
GPT-5$1.25$10.00
GPT-5.1$1.25$10.00
GPT-5 Search API$1.25$10.00
GPT-3.5 Turbo 16K$3.00$4.00
o3 Mini$1.10$4.40
o4 Mini$1.10$4.40
GPT-5.4 Mini$0.75$4.50
GPT-3.5 Turbo$0.50$1.50
GPT-4.1 Mini$0.40$1.60
GPT-5 Mini$0.25$2.00
GPT-5.4 Nano$0.20$1.25
GPT-4o Mini$0.15$0.60
GPT-6 Luna$0.10$0.50
GPT-4.1 Nano$0.10$0.40
GPT-5 Nano$0.05$0.40