From the source
Perplexity announces price cuts for GPT-5.6 Luna and Terra, and introduces Fast mode for GPT-5.6 Sol at double standard token pricing.
From the source
GPT-5.6 Luna now costs $0.20 per million input tokens and $1.20 per million output tokens. GPT-5.6 Terra now costs $2 per million input tokens and $12 per million output tokens. GPT-5.6 Sol now supports Fast mode at 2× standard token pricing; send service_tier: "priority" to use it.
docs.perplexity.ai