GPT-5.6 Luna cost drops 80%
Source: OpenAI, Advancing the price-performance frontier with GPT-5.6, using Artificial Analysis Intelligence Index v4.1 results.
OpenAI has cut the API price of GPT-5.6 Luna by 80 per cent, only three weeks after releasing it.
The new price is US$0.20 per million input tokens and US$1.20 per million output tokens, down from US$1 and US$6. Terra has also become 20 per cent cheaper. Sol is unchanged.
The chart above is the arresting part. Luna at maximum reasoning scores 51 on the Artificial Analysis Intelligence Index. Claude Opus 5 at low reasoning scores the same. Yet Luna appears to cost roughly five cents per benchmark task, against about 35 cents for Opus.