GPT-5.6 Luna
OpenAI's GPT-5.6 Luna is the cost-sensitive GPT-5.6 tier for high-volume workloads that still need current GPT-5.6 behavior, vision input, structured outputs, and tool support.
Newer version: GPT-6 Luna
Provider
OpenAI
Model family
OpenAI GPT
Multimodal LLM
Cost tier
Luna
Status
Current
Why teams choose it
Broad capability envelope
Useful when the same stack must cover chat, multimodal inputs, tooling, or structured-output shapes without juggling many SKUs.
Long-context analysis
Helps teams summarize, compare, and extract insights from long documents without losing important nuance.
Coding and tools
Works well for code assistance, tool calling, and agent workflows where instructions must stay consistent across steps.
Cost-efficient routing
Useful as part of a routing stack where cheap models handle drafts and confirmations and this tier handles genuinely hard passages.
When not to use this
- Do not use as the default for frontier reasoning without task-level evals.
Benchmarks
No independent or vendor benchmark scores in this catalog entry.
Technical specs
- Inputs
- text, image
- Outputs
- text
- License
- Proprietary API
- Capabilities
- reasoning
- vision
- function calling
- structured outputs
- low cost
OpenAI GPT family lineup
Current models
Previous versions
Related models
Available through
Verified subscription plans that list this model.
GPT-5.6 Luna FAQ
What is GPT-5.6 Luna?
OpenAI's GPT-5.6 Luna is the cost-sensitive GPT-5.6 tier for high-volume workloads that still need current GPT-5.6 behavior, vision input, structured outputs, and tool support.
When does GPT-5.6 Luna fit best?
Simple assistant turns
What should teams watch out for with GPT-5.6 Luna?
Do not use as the default for frontier reasoning without task-level evals.
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