GPT-5.6 Luna

In LLM

OpenAI GPT-5.6 Luna LLM reasoning coding AI agent multimodal long context tool use cost efficient high volume

OpenAI’s fastest and most cost-efficient GPT-5.6 model for high-volume coding, reasoning, and agentic workloads.

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Cost-efficient model

Optimized for high-volume workloads where speed and price matter

Fast inference

The fastest and lowest-cost model in the GPT-5.6 family

1.05M token context

Processes large codebases, documents, and extended project histories

128K token output

Produces long implementations, reports, and structured responses

Reasoning support

Uses reasoning tokens for technical and multi-step tasks

Multimodal input

Accepts text and image inputs

Agentic workflows

Completes multi-step tasks using tools and external services

Function calling

Connects with custom APIs, functions, and application workflows

Structured outputs

Produces responses that follow predefined JSON schemas

Streaming support

Delivers incremental responses for responsive applications

Prompt caching

Reduces cost when reusing large, repeated prompt contexts

High-throughput design

Suitable for large-scale production workloads and repeated model calls

Power high-volume AI features in production applications
Build cost-efficient coding assistants and developer tools
Generate and transform structured JSON data
Classify, summarize, and extract information from large document sets
Process screenshots, diagrams, and visual application inputs
Automate repetitive business and operational workflows
Run lightweight autonomous and semi-autonomous agents
Generate code, tests, documentation, and implementation suggestions
Create large-scale content processing pipelines
Handle customer support routing and response generation
Analyze long prompts and extensive project context
Use fallback or background models for latency-sensitive applications

Available through the OpenAI API with usage-based token pricing.

Standard API pricing per 1 million tokens:

Input: $1.00

Cached input: $0.10

Output: $6.00

Requests containing more than 272K input tokens are charged at 2× the standard input rate and 1.5× the standard output rate for the full request.

Cache writes are billed at 1.25× the uncached input-token rate.

GPT-5.6 Luna is available through the OpenAI API, Codex, and eligible ChatGPT Work experiences. It is not selectable in standard ChatGPT conversations.

Commercial usage is subject to OpenAI’s applicable service terms, API terms, and usage policies.

Integration highlights

OpenAI Responses API
OpenAI Chat Completions API
OpenAI API
Codex
ChatGPT Work
OpenAI SDKs
Function Calling
Structured Outputs
Streaming
Batch API
Prompt Caching
Image Inputs

Docs & Developer Links

API
DOCUMENTATION

Community Discussion

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GPT-5.6 Luna

Key Features⌄

Cost-efficient model

Fast inference

1.05M token context

128K token output

Reasoning support

Multimodal input

Agentic workflows

Function calling

Structured outputs

Streaming support

Prompt caching

High-throughput design

Use Cases⌄

Pricing & Licensing⌄

Integrations & Tech Details⌄

Integration highlights

Docs & Developer Links

Community Discussion

Similar & Alternative Tools

Grok Imagine Video 1.5

Claude Opus 5

GPT-5.6 Luna

GPT-5.6 Terra