ChatGPT & OpenAI Consulting Services for the Enterprise — EPC Group

EPC Group delivers Azure OpenAI Service architecture (preferred deployment path for regulated enterprises), ChatGPT Enterprise rollout for productivity, custom GPT design for departmental workflows, Responses API agent patterns for agentic workloads (the Assistants API was retired on August 26, 2026; Assistants builds are migrated, not extended), fine-tuning programs for domain-specific models, prompt engineering, retrieval-augmented patterns against SharePoint and Microsoft Graph, safety guardrails, and the seven-layer agentic governance framework.

For regulated mid-market and Fortune 500 enterprises EPC Group recommends Azure OpenAI Service in nearly every case. Azure OpenAI keeps data at rest in the resource's Azure geography and processes prompts and responses where the chosen deployment type says — within that geography for Standard and Regional Provisioned, within the US, EU or APAC data zone for Data Zone, in any Azure region for Global; Microsoft Entra identity, conditional access and PIM apply when the deployment is configured for keyless Entra authentication rather than API keys; Purview classification, DLP and audit cover the interactions when the app is Entra-registered and a DSPM for AI policy captures them; the resource runs inside the customer's existing Azure compliance scope (SOC 2, HIPAA under the BAA, FedRAMP for Azure Government, FINRA, GxP — depending on region and service), and bills under the consolidated Azure agreement. Direct OpenAI API is appropriate for very early prototypes or when a specific OpenAI feature (e.g., GPTs marketplace, ChatGPT Team specific surfaces) is required.

Microsoft 365 Copilot is built on Azure OpenAI under the covers — it is the productivity surface anchored to Microsoft Graph, Purview labels, and tenant policy for office workers. EPC Group engages standalone OpenAI / Azure OpenAI for line-of-business workflows (custom chat surfaces, agentic automation, document processing pipelines, embeddings-based search) that fall outside the M365 Copilot productivity scope, and for departmental Custom GPTs and Assistants tuned to a specific business process.

Azure OpenAI Service is HIPAA-eligible under the Microsoft BAA, SOC 2 covered, FINRA accommodated, and FedRAMP coverage exists for Azure Government regions. The architecture posture, region selection, Purview classification, prompt logging policy, and audit artifacts EPC Group delivers map directly to the buyer's compliance review. Consulting delivery is FedRAMP-aligned; product status of underlying Azure OpenAI deployment depends on region and tenant agreement.

Layer 1 Microsoft Entra non-human identity for any GPT-backed agent making downstream Microsoft Graph or Power Platform calls. Layer 2 Decision boundaries — explicit allowed action lists. Layer 3 Escalation rules to a human approver. Layer 4 Audit trail — every prompt, response, tool call, and downstream effect logged to immutable storage. Layer 5 Anomaly monitoring on call patterns and output distribution. Layer 6 Named-owner accountability per agent. Layer 7 Model-version pinning, A/B canary, rollback path. Identical framework across Azure OpenAI, Microsoft 365 Copilot, Anthropic Claude, and Google Gemini.

EPC Group engaged with OpenAI during the GPT-3 beta and has shipped GPT-anchored solutions for regulated enterprises across healthcare, financial services, federal/defense, and life sciences ever since. The firm was an early Azure OpenAI Service partner and operates the OpenAI practice inside the broader AI consulting team led by Errin O'Connor.