ChatGPT Business fits these requirements
Your answers describe a team that wants shared work, a company administrator, and straightforward central billing. They do not describe negotiated procurement, specialist security review, or custom enterprise integrations. ChatGPT Business is the matching starting point. Published seat prices change, so use the AI Build pricing page and OpenAI’s current checkout rather than a figure in this result.
Why this matches
The answers combine team use with company administration, confidential-information controls that a business workspace can address, and a preference for central billing or a structured but ordinary rollout. Headcount alone did not decide this. The same result can apply to a small team or a large one when the governance answers stay in this range.
Limitations and when to reconsider
ChatGPT Business is not a substitute for a formal security and procurement review, contractual negotiation, or custom enterprise integrations. If any of those become requirements, look at ChatGPT Enterprise or ask AI Build to review the conflict. Enterprise is quoted rather than listed at a public seat price. SSO is available on more than one company plan; do not treat a single product name as proof of every control.