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GPT-5.6 Luna

Model Information

Display Name: GPT-5.6 Luna

API Model ID: openai/gpt-5.6-luna

Category: Image To Text

Description: GPT-5.6 Luna is the cheapest tier of OpenAI's GPT-5.6 line, built for high-volume work. It keeps the family's 1.05M-token context window, reasoning controls and multimodal input at the lowest price of the three. **Key Features:** - 1,050,000-token context window - Up to 128K output tokens - Multimodal input: text, image and file - Function/tool calling and structured outputs (JSON schema) - Reasoning with adjustable effort, including fully disabled - Prompt caching for cheaper repeated context **Best For:** - High-volume chat and classification - Cheap passes over very long context - Backend of routed/virtual models **Note:** prompts above 272K tokens are billed by OpenAI at double the base rate. Our price is flat and already accounts for it.

Context Window: 1,050,000 tokens

Max Output: 128,000 tokens

How to Use This Model

To use GPT-5.6 Luna via the HInow.ai API, use the model ID: openai/gpt-5.6-luna

API Request Example (Chat/Text)


POST https://api.hinow.ai/v1/chat/completions
Authorization: Bearer YOUR_API_KEY
Content-Type: application/json

{
  "model": "openai/gpt-5.6-luna",
  "messages": [
    {"role": "user", "content": "Your message here"}
  ]
}

API Request Example (Image Generation)


POST https://api.hinow.ai/v1/images
Authorization: Bearer YOUR_API_KEY
Content-Type: application/json

{
  "model": "openai/gpt-5.6-luna",
  "prompt": "Your image description here"
}

Pricing

  • input: $1.20
  • output: $5.40

Available Parameters

  • max_tokens: Max tokens to generate, including reasoning (Options: 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 128000)
  • reasoning_effort: Reasoning depth. 'none' disables reasoning entirely (Options: none, low, medium, high)
  • seed: Integer seed for reproducible sampling
  • tools: Function/tool definitions for agentic workflows
  • tool_choice: Controls whether the model calls a tool (Options: auto, none, required)
  • response_format: Output format (structured outputs supported) (Options: text, json_object, json_schema)

Quick Reference

To use this model, set: "model": "openai/gpt-5.6-luna"

Featured: No

Documentation: https://hinow.ai/models/openai/gpt-5.6-luna

API Endpoint: https://api.hinow.ai/v1

Back to Models
GPT-5.6 Luna

GPT-5.6 Luna

openai/gpt-5.6-luna

$1.20 / $5.40
per 1M tokens (in/out)

About

GPT-5.6 Luna is the cheapest tier of OpenAI's GPT-5.6 line, built for high-volume work. It keeps the family's 1.05M-token context window, reasoning controls and multimodal input at the lowest price of the three.

Key Features:

  • 1,050,000-token context window
  • Up to 128K output tokens
  • Multimodal input: text, image and file
  • Function/tool calling and structured outputs (JSON schema)
  • Reasoning with adjustable effort, including fully disabled
  • Prompt caching for cheaper repeated context

Best For:

  • High-volume chat and classification
  • Cheap passes over very long context
  • Backend of routed/virtual models

Note: prompts above 272K tokens are billed by OpenAI at double the base rate. Our price is flat and already accounts for it.

Capabilities

Image To TextText To Text
Context1050K tokens
Max Output128K tokens

Parameters

max_tokens

Max tokens to generate, including reasoning

5121024204840968192163843276865536128000
reasoning_effort

Reasoning depth. 'none' disables reasoning entirely

nonelowmediumhigh
seed

Integer seed for reproducible sampling

tools

Function/tool definitions for agentic workflows

tool_choice

Controls whether the model calls a tool

autononerequired
response_format

Output format (structured outputs supported)

textjson_objectjson_schema

Code Examples

curl -X POST https://api.hinow.ai/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $HINOW_API_KEY" \
  -d '{
    "model": "openai/gpt-5.6-luna",
    "messages": [
      {
        "role": "user",
        "content": [
          {"type": "text", "text": "Describe this image"},
          {"type": "image_url", "image_url": {"url": "https://example.com/image.jpg"}}
        ]
      }
    ],
    "parameters": {
      "max_tokens": "512",
      "reasoning_effort": "none",
      "seed": "",
      "tools": "",
      "tool_choice": "auto",
      "response_format": "text"
    }
  }'