CustomGPT vs SiteSpeakAI
CustomGPT has built a reputation for accurate, source-cited answers and strong anti-hallucination handling. If citation accuracy is your single priority and budget is not a constraint, it is a respected option. SiteSpeakAI also grounds answers in your own content and cites sources, using retrieval with reranking, and it does so at a lower price with fewer restrictions.
The practical differences show up in three places: the free plan, model choice, and human handoff.
Free plan, price, and model choice
CustomGPT has no free plan, only a 7-day trial that needs a card, and starts at $99/month. SiteSpeakAI has a free plan and starts at $29/month, so you can build and test on a real site before paying.
Model choice is the other gap. CustomGPT's Standard plan is locked to a single model, and choosing the model per agent is reserved for its Enterprise tier. SiteSpeakAI lets you pick from OpenAI, Anthropic, Google, and xAI on paid plans, and bring your own keys on Pro.
Human handoff
When a conversation needs a person, CustomGPT routes it into the external helpdesk queue your team already runs. That works if you already pay for a helpdesk, but it means another tool in the loop. SiteSpeakAI includes its own inbox, so a human can take over the live conversation in the same place your visitors are chatting.
For teams that want grounded answers plus a free plan, real model choice, and built-in live chat, SiteSpeakAI covers more of the job for less.
