GPT-6 Sol and Luna arrive at half the price — the AI market splits exactly as expected
OpenAI's new mid and budget models cost about 50% less than the GPT-5.6 tier. Astra stays premium. The frontier-up, commodity-down split is now official.
Stated by the maker, publisher, or platform holder.
Three weeks after launching its premium GPT-6 Astra at $10/$50 per million tokens, OpenAI has released the rest of the family — and priced it the other way. GPT-6 Sol and GPT-6 Luna launched on 22 September at roughly half the cost of the models they replace.
What's confirmed
OpenAI describes the pair as cut from the same cloth as Astra — the same model generation, packaged at lower capability and much lower cost.
If the Luna claim holds, it's the headline: last generation's mid-tier model, at roughly a hundredth of the price, a year later. That's the rate at which commodity AI is getting cheaper.
The split is now official
We've been tracking this for a month. In late August the story was prices collapsing and flagship models converging. Then Astra launched at 2.5 times the previous flagship's price, and Microsoft cut transcription to $0.10 an hour in the same week.
Sol and Luna complete the picture. One company's lineup now spans a 100x price range:
| Model | Input / output per million tokens | Position |
|---|---|---|
| GPT-6 Astra | $10 / $50 | Frontier, gated cyber features |
| GPT-6 Sol | $2 / $10 | Mid-tier, general use |
| GPT-6 Luna | $0.10 / $0.50 | Budget, high volume |
The top gets more expensive because buyers doing the hardest work will pay for the best model. Everything below it gets cheaper because, once several models are good enough, price is what's left to compete on.
What it means
For most people using ChatGPT, this shows up as better default models without a price change. For anyone building on the API, it means routing matters more than it used to: sending routine work to Luna and reserving Astra for the hard cases could cut costs dramatically, and the gap between those two choices is now 100x on input.
It also sits awkwardly next to OpenAI's $1.5 trillion fundraising. Cutting prices in half on your volume products while raising at that valuation is a bet that usage grows far faster than revenue per token falls. That's the wager the whole industry is making right now, and Sol and Luna are OpenAI placing it in public.