GPT-5.6 is OpenAI's 2026 flagship model family, available in three tiers: Sol (highest performance), Terra (balanced, GPT-5.5-equivalent at half the cost), and Luna (lowest cost, high speed). Released June 26, 2026.
Parameters
Undisclosed
Context Window
License
Proprietary
Release Date
2026-06-26
API Pricing
Input Price (per 1M tokens)
$1
Output Price (per 1M tokens)
$
Billing Mode: standard