Frequent 503 trying to use Kimi K3 on Fireworks.ai via Vercel AI Gateway

I’m trying to use model:moonshotai/kimi-k3 on provider:fireworks via Vercel AI Gateway, but I’m getting 60% or more 503 errors:

"message":"Service temporarily unavailable. Please try again shortly."
"type":"service_unavailable_error"

No issue with other providers on the same model.

I have raised this with the Fireworks team and they have confirmed no issue on their side. Plausibly hitting Vercel-specific rate limit buckets.

Message from Fireworks support:

Vercel will need to check their setup/logs and reach out to their contact in Fireworks if it is.