GPT-5.6 Luna

Overview

GPT-5.6 Luna is openai’s fastest and lowest-cost model in the gpt-56 family, positioned for high-volume tool-using and multi-step workflows.

Recent Developments

• 2026-07-30: API price cut 80% to $0.20/$1.20 per million input/output tokens (from $1/$6) (2026-07-31-openai-gpt56-price-cuts-official, 2026-07-31-openai-gpt56-price-cuts-apidog).
• Also reflected in Codex / ChatGPT Work credit consumption; subscription prices unchanged.

Related

• openai
• gpt-5-6-terra
• gpt-5-6-sol
• ai-price-wars
• ai-inference

Sources

• 2026-07-31-openai-gpt56-price-cuts-official
• 2026-07-31-openai-gpt-56-luna-terra-price-cuts