GPT-5.6 Luna
Fast, cost-efficient tier of the GPT-5.6 series for high-volume, latency-sensitive work such as chat, classification, and lightweight agents.
Pricing
Input$1 / 1M checked Jul 19, 2026
Output$6 / 1M checked Jul 19, 2026
A Pro serving mode (reasoning.mode=pro) is available at the same list price.
Cost bandBudget
Free tierNo free API tier.
Limits
Context window1M checked Jul 19, 2026
DeploymentOpenAI API
OpenAI-compatible APIYes
ModalitiesText, Image input, PDF input
Where it fits
Best forHigh-volume chat, classification, extraction, and light agent steps.
Business fitHigh-volume option with capable reasoning at a fraction of flagship cost.
Capabilities
Reasoning modesFunction callingStructured outputsWeb searchMCP
Change history
- Jul 9, 2026New modelGPT-5.6 Luna added to the index $1 / 1M in / $6 / 1M out, 1M context. Luna tier of the GPT-5.6 series. OpenAI models index
Data
Last checkedJul 19, 2026
Cross-checked againstopenrouter.ai/openai/gpt-5.6-luna
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