Frontier Preview Mode — Price Frontier Models Before They Ship | Cromus
Frontier Preview Mode lets teams weigh the cost and effectiveness of frontier AI models on their workflows before those models reach general availability. Frontier models ship faster than any budget can react, and each one quietly redraws the cost curve. Instead of waiting for general availability, wiring a new model in, running real traffic, and reading the invoice a month later, Frontier Preview Mode answers the question up front: if I move this workflow to the new model, what happens to my bill, and is the quality jump worth it?
The frontier models Cromus tracks include OpenAI's GPT-5.6 family — Sol (premium tier, indicative $5 in / $30 out per 1M tokens), Terra (balanced, $2.50 / $15), and Luna (balanced, $1 / $6), all currently in limited preview and not yet generally callable — and Anthropic's premium frontier tier, Claude Fable 5 and Claude Mythos 5 ($10 / $50), whose API access is currently suspended under a June 2026 export-control directive with pricing preserved for reactivation. Pricing is provisional and mirrors each provider's published preview rates.
Frontier Preview Mode is a modeling layer, not a deploy path. A preview model only enters a simulation when explicitly pinned to a node; it is never auto-selected as the cheapest option, so a not-yet-shippable model can never quietly become the default. Every node priced on a preview model is flagged as provisional, and any workflow containing one carries a blocked-deploy banner until a generally available model is swapped back in. Frontier Preview Mode is rolling out on the Founding plan and above.