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Text ModelProprietary

GPT-5.6 Luna

by OpenAI

Analysis by:the whichllmmodel Editorial Team|Updated: June 2026

Benchmark Evaluations

CodingSWE-bench Pro
62.7%
ReasoningGPQA Diamond
92.3%

Pricing Details

Input Cost
$1.00
per 1M tokens
Output Cost
$6.00
per 1M tokens
Blended Cost
$2.25
based on 3:1 ratio
Context Window
1.05M tokens

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Quick Info

  • ProviderOpenAI
  • CategoryText / Chat
  • LicenseProprietary
  • AvailabilityAPI Only
  • WebsiteVisit Website ↗

Frequently Asked Questions about GPT-5.6 Luna

GPT-5.6 Luna has a blended cost of $2.25 per 1 million tokens (calculated using a standard 3:1 input-to-output token ratio). Its specific pricing is $1.00 per 1M input tokens and $6.00 per 1M output tokens.

GPT-5.6 Luna supports a context window of 1.05M tokens. This allows it to process large documents, codebase segments, or long chat histories in a single query session.

GPT-5.6 Luna scores 62.7% on coding evaluations (swe-bench-pro) and 92.3% on reasoning tasks (gpqa-diamond).

GPT-5.6 Luna is an proprietary model developed by OpenAI.

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