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OpenAI vs OpenAI

GPT-5.6 Terra vs GPT-5.6 Luna: pricing comparison

GPT-5.6 Luna costs 10.0× less than GPT-5.6 Terra for a typical 1,000-input, 500-output request. Here is how the two compare on price, context and discounts.

Prices last updated:

GPT-5.6 TerraGPT-5.6 Luna
ProviderOpenAIOpenAI
Input per 1M tokens$2.00$0.20
Output per 1M tokens$12.00$1.20
Context window1.05M1.05M
Batch discount50% off50% off
Typical request (1,000 in / 500 out)$0.008$0.0008
Monthly at 1,000 requests/day$240.00$24.00

GPT-5.6 Terra: Inputs above 272K tokens are billed at a higher long-context rate ($4 / $18).

GPT-5.6 Luna: Inputs above 272K tokens are billed at a higher long-context rate ($0.40 / $1.80).

Compare with your own numbers

GPT-5.6 Terra per request
$0.008
Per month
$240.00
GPT-5.6 Luna per request
$0.0008
Per month
$24.00

Cost by task

Cost per 1,000 requests at standard prices.
TaskTokens (in / out)GPT-5.6 TerraGPT-5.6 Luna
Short chat reply500 / 300$4.60$0.46
RAG answer6,000 / 600$19.20$1.92
Summarize a long document12,000 / 1,000$36.00$3.60
Output-heavy generation1,000 / 4,000$50.00$5.00

Output tokens usually dominate the bill — see input vs output token cost.

Frequently asked questions

Is GPT-5.6 Terra or GPT-5.6 Luna cheaper?
GPT-5.6 Luna is cheaper for a typical request of 1,000 input and 500 output tokens: $0.0008 versus $0.008 for GPT-5.6 Terra, about 90% less.
What are the per-token prices of GPT-5.6 Terra and GPT-5.6 Luna?
GPT-5.6 Terra costs $2.00 input and $12.00 output per million tokens. GPT-5.6 Luna costs $0.20 input and $1.20 output per million tokens.
Which has the larger context window, GPT-5.6 Terra or GPT-5.6 Luna?
Both accept 1.05M tokens of context.

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