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OpenAI reduced GPT-5.6 Terra pricing by 20% and GPT-5.6 Luna pricing by 80%.
OpenAI announced significant price cuts for two GPT-5.6 model variants. ✦ AI generated
Author · Simon Willison's Weblog · 2026-07-30 · original ↗
Huge price drop from OpenAI today: GPT-5.6 Terra got a 20% reduction, and GPT-5.6 Luna got a massive 80% drop.
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- ·GPT-5.6 Terra pricing reduced by 20%
- ·GPT-5.6 Luna pricing reduced by 80%
- ·Announced as a "huge price drop"
- ·Luna's 80% cut is 4x Terra's 20%
- ·Luna's drop described as "massive"
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explains mechanism → The author switched their agent.datasette.io demo site from Gemini 3.1 Flash-Lite to GPT-5.6 Luna following the price cut.Author · Simon Willison's Weblogprovides context → At $0.20/$1.20 per million tokens, GPT-5.6 Luna is cheaper than Google's Gemini 3.1 Flash-Lite and 1/5th the input price of Anthropic's Claude Haiku 4.5.Author · Simon Willison's Weblogprovides context → OpenAI is discounting its mid-tier Terra model by 20% and its low-tier, faster Luna model by 80%, partly to steer users toward cheaper tiers and to compete with cheaper emerging Chinese models.Wes (Host) · Syntax