On August 21, 2026, OpenAI cut the price of GPT-5.6 Sol, its flagship model, from $5.00/$30.00 per million input/output tokens to a promotional $4.00/$20.00, a 20% cut on input and a 33% cut on output. OpenAI has stated the promotional rate is available at least through November 21, 2026.
The two lower tiers in the GPT-5.6 family, Terra and Luna, were not affected by this specific cut. Terra remains at $2.00/$12.00 and Luna at $0.20/$1.20 per million tokens.
For context, output tokens on GPT-5.6 Sol are now priced at 5x input tokens, down from 6x before the cut. If your workload leans heavily on long completions rather than long prompts, this cut has more impact on your bill than the headline percentages suggest.
Our AI API Cost Calculator has been updated to reflect the current promotional rate. If you're budgeting past November 21, 2026, it's worth checking OpenAI's pricing page directly in case the promotional rate lapses or becomes permanent.
Our AI API Cost Calculator uses the promotional $4.00/$20.00 rate. When OpenAI ends or changes the promotion, we will update the calculator and note the change here.