GPT-5.6 Luna Pro
by OpenAItext+image+file->text5 endpoints
Overview
GPT-5.6 Luna Pro is the same underlying model as GPT-5.6 Luna, served with reasoning.mode set to pro for higher-quality responses on complex tasks.
Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode
Capabilities
Text generation
Image understanding
Tool use / Function calling
Structured output
Extended reasoning
Prompt caching
Long context
File input
Deterministic seed
Modalities
Input
FileImageText
Output
Text
Technical Specifications
Context Window
1.1M tokens
Max Output
128K tokens
Knowledge Cutoff
2026-02-16
Tokenizer
GPT
Content Moderation
Enabled
Uptime (24h)
9566.5%
Supported Parameters
include_reasoningmax_completion_tokensmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetools
Pricing
Per 1M tokens
Input$1.00
Output$6.00
Cache read$0.10
Cache write$1.25