GPT-5.6 Luna

OpenAI chatreasoningtool_usevision Long

API ID: openai/gpt-5.6-luna-20260709

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Input Price
$1.00
/1M tokens
Output Price
$6.00
/1M tokens
Cached Input
$0.10
Save 90%

About GPT-5.6 Luna

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 for...

💰
Price Ranking
#1086 lowest price among 1240 Chat models

Model Specifications

Context Length
1.1M
Max Output
128k
Release Date
2026-07-09
Capabilities
chat reasoning tool_use vision
Input Modalities
fileimagetext
Output Modalities
text

Best For

  • Complex reasoning, math problems, multi-step logic
  • Image analysis, document understanding, visual Q&A
  • Conversations, content writing, general assistance

Consider Alternatives For

  • Simple Q&A (cheaper models available)

💰 Real-World Cost Examples

Estimated monthly costs for common use cases

Personal AI Assistant
$2.25
/month
50 conversations/day, ~500 tokens each
Customer Service Bot
$69.00
/month
1000 tickets/day, ~800 tokens each
Data Analysis Pipeline
$94.50
/month
500 analyses/day, ~2k tokens each
Calculate Your Custom Usage

OpenAI Model Lineup

Compare all models from OpenAI to find the best fit

Model Input Output Context Capabilities
GPT-5.6 Luna Current Free Free 1.1M chat reasoning tool_use vision
GPT-3.5 Turbo 16k (older v1106) Free Free 16k chat
GPT-3.5 Turbo 16k (older v1106) Free Free 16k chat
GPT-4 32k Free Free 33k chat
GPT-4 32k Free Free 33k chat
GPT-4 32k (older v0314) Free Free 33k chat
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🚀 Quick Start

Get started with GPT-5.6 Luna API

OpenAI Python SDK 
from openai import OpenAI
client = OpenAI()

response = client.chat.completions.create(
    model="openai/gpt-5.6-luna-20260709",
    messages=[
        {"role": "user", "content": "Hello!"}
    ]
)
print(response.choices[0].message.content)

Resources

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