OpenAI releases GPT-6 Sol and Luna — and cuts token prices in half

OpenAI on Tuesday released GPT-6 Sol and Luna, which will complement the flagship GPT-6 Astra model in OpenAI’s lineup. As of now, there is no GPT-6 Terra.

The new GPT-6 pricing

The headline news here is that OpenAI cut the price per million input/output tokens by half or more, compared to the previous version. GPT-6 Sol will cost $2/$10 per million input/output tokens (vs. $4/$20 for GPT-5.6 Sol), and Luna will come in at $0.10/$0.50 (vs. $0.20/$1.20).

The GPT-5.6 pricing was always meant to be promotional, but for the new GPT-6 models, this is the default price, an OpenAI spokesperson tells The New Stack.

“Improvements in caching and inference let us serve these models at lower cost, and we’re passing those savings directly on to users and customers,” OpenAI explains in its announcement.

Benchmarks

As you would expect, the new models show clear improvements over the GPT-5.6 predecessors, but for the most part, these are not all that extreme.

TNS Note: Unlike with previous releases, OpenAI did not provide us with a full set of benchmark results ahead of the launch. We will update this story once we get them.

On a benchmark like Zapier’s AutomationBench — which checks how well the models work on a set of business workflow tests — GPT-6 Luna improves by 5.4 percentage points over the previous version, for example.