OpenAI releases GPT-6 Sol and Luna models, slashing API costs 50% or more

OpenAI is expanding its lineup of AI models with the new GPT-6 Sol and GPT-6 Luna, mid-priced and lower tier models designed to serve as enterprise workhorses for common tasks requiring less intelligence — and both are priced at half or less the costs of their predecessors when accessed over OpenAI's application programming interface (API).

Both improve on benchmarks over their 5.6 predecessors, as well, though they remain less performant and less powerful than the flagship GPT-6 Astra model released earlier this month with a grand statement from the company's president that we are now in the "AGI era," or artificial general intelligence.

OpenAI says improvements to inference and caching allowed it to reduce prices while increasing capability. An OpenAI spokesperson confirmed to VentureBeat that these GPT-6 Sol and Luna rates are permanent prices, not promotional or introductory pricing. Against OpenAI’s currently published GPT-5.6 rates, the drop is substantial:

• GPT-5.6 Sol currently costs $4 per million input tokens and $20 per million output tokens, making GPT-6 Sol exactly 50% cheaper in both directions.

• GPT-5.6 Luna currently costs $0.20 input and $1.20 output, making GPT-6 Luna 50% cheaper on input and 58.3% cheaper on output.