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by OpenAI

OpenAI: GPT-5.6 Luna.

multimodal closed 1.1M ctx
Cheapest input
$1.0/M
on OpenRouter
Cheapest output
$6.0/M
on OpenRouter
Hosted equiv.
~$2.16/hr
@ 100 tok/s on OpenRouter

GPT-5.6 Luna is a fast, cost-efficient model in OpenAI's GPT-5.6 series. It is suited for high-volume, latency-sensitive tasks such as chat, classification, and lightweight agentic workflows, providing capable reasoning

Hosted API only

No self-host path — closed weights.

OpenAI: GPT-5.6 Luna's weights aren't published. Use it via the access providers below.

Where to use it

Cheapest hosted endpoints.

Provider Access $/M in $/M out
OpenRouter api aggregator $1.0 $6.0 Launch ↗
FAQ

Frequently asked.

How do I run OpenAI: GPT-5.6 Luna?
OpenAI: GPT-5.6 Luna is a closed-source API model. The cheapest way to access it is through the API providers listed on this page (direct API, aggregators, and hosted chat UIs).
Where can I access OpenAI: GPT-5.6 Luna?
OpenAI: GPT-5.6 Luna is available via OpenRouter. Each access option lists its own pricing (per million tokens or hourly hosting).
How much does it cost to run OpenAI: GPT-5.6 Luna?
API pricing starts at $1.0/M input tokens and $6.0/M output tokens. Self-hosting cost depends on the GPU you rent — see the Run It Yourself tab.
Is OpenAI: GPT-5.6 Luna open-source or proprietary?
OpenAI: GPT-5.6 Luna is a proprietary model from OpenAI. Access is API-only — there are no public weights to download.