Well there can't be direct evidence, it's a private corporation and we don't know how big the model is. But you can look on Openrouter for hosters that offer free models with known sizes, where there's no brand and so no incentive to subsidize, and they don't look wildly bigger than OpenAI/Anthropic API prices.

edit: example: GLM 5.1, a 751B model, is offered for 0.6$/m in, 4.43$/m out. Scuttlebutt (ie. I asked Google's AI) seems to think that Opus 4 is a 1T/5T MoE model, so you can treat it (with some effort) as a 1T model for pricing purposes. Its API pricing is $1.55 in, $25 out, ie. 2x to 5x more than GLM. Idk what to say other than this sounds about right, probably with healthy margin.