OpenAI Integration Canada | GPT-5 + ChatGPT API + Realtime Voice

Production OpenAI Builds

{ "Most businesses use ChatGPT consumer": { " Few have actually deployed OpenAI's API in production where it matters - customer-facing apps, internal tools, and real workflows": { " We build the integrations": "API + Assistants + Agents SDK + Realtime API, all tied to your systems." } } }

What "OpenAI Integration" Actually Means

ChatGPT is a consumer product. The OpenAI API is the developer platform. Building real OpenAI-powered features requires API integration, function calling, structured outputs, retrieval augmentation, eval suites, observability, and cost controls. Most "ChatGPT for business" projects fail because teams underestimate the gap between consumer ChatGPT and production OpenAI. We close that gap. We build OpenAI integrations that handle real production volume, have measurable success criteria, and integrate with your actual business systems through function calling and tools.

What We Build on the OpenAI Stack

Custom GPTs with real tools. Most "custom GPTs" in the ChatGPT store are prompt wrappers. We build custom GPTs that actually connect to your CRM, your booking system, your inventory, your knowledge base via Actions and function calling. Voice agents on Realtime API. GPT-4o Realtime API enables natural-feeling voice agents. We build customer-facing voice agents that handle inbound calls, schedule appointments, qualify leads. Vision and document workflows. GPT-4o vision for invoice processing, receipt extraction, form digitization, image-based customer support, content moderation. Code and workflow agents. OpenAI Agents SDK for production agents that take real actions in real systems. DALL-E and image pipelines. Programmatic image generation for e-commerce product photos, marketing assets, content production.

The Stack

Models: GPT-5 (max reasoning), GPT-4o (multimodal), GPT-4o-mini (cost-effective), o1/o3 (deep reasoning), DALL-E 3 (images), Whisper (transcription). Frameworks: OpenAI Agents SDK, Assistants API, function calling, structured outputs, batch API for cost reduction. Observability: Helicone, LangSmith, custom OTel. Deployment: Vercel AI SDK, Modal, custom Python services.

Process

Week 1: Discovery, architecture, model selection. Week 2-3: Build, integrations, prompt engineering. Week 4: Eval + tune. Week 5: Production deployment + monitoring.

Our Approach

Our OpenAI Engineering Principles

Production-grade builds

Function Calling First

Real tools connected to real systems. Not prompt-based simulation.

Structured Outputs

JSON Schema everywhere. Type-safe, validated, production-reliable.

Eval-Driven Tuning

Every integration has a measurable success criterion and an eval suite.

Cost-Aware Routing

GPT-4o-mini for classification, GPT-5 for hard reasoning. Saves 80% on cost.

Observability Built In

Every API call traced, costs tracked, errors surfaced.

What We Offer

OpenAI Integration Services

Production builds on the OpenAI stack

Custom GPTs with Actions

Custom GPTs that connect to your real business systems.

Custom Actions (API integrations)
Knowledge base setup
Multi-tool workflows
Authentication + access control
ChatGPT marketplace deployment

Voice Agents (Realtime API)

Natural voice agents powered by GPT-4o Realtime.

Inbound call handling
Multi-language support
CRM + booking integration
Sentiment-aware escalation
Sub-300ms response latency

Vision Workflows

Image and document processing on GPT-4o vision.

Invoice + receipt extraction
Form digitization
Visual quality control
Image-based search
Multi-page document workflows

Workflow Agents

Production agents on the OpenAI Agents SDK.

Multi-tool agent loops
Structured output validation
Cost-optimized model routing
Observability stack
Production deployment

Investment

OpenAI Integration Pricing

Production builds + ongoing optimization

Integration

Starting at $5,500

Single OpenAI integration with existing systems

2-3 weeks

API integration
Custom prompts + functions
Cost optimization
Observability setup
30 days tuning

Production App

Starting at $14,000

Multi-feature OpenAI app with full eval stack

4-7 weeks

Multi-tool architecture
Structured outputs
Eval suite
Cost monitoring
90 days tuning

Voice Agent System

Starting at $22,000

Production voice agent on GPT-4o Realtime

6-10 weeks

Realtime API integration
Phone number + telephony
CRM + booking integration
Eval + monitoring
90 days tuning

OpenAI Integration FAQs

ChatGPT vs OpenAI API - what's the difference?

ChatGPT is the consumer product. The OpenAI API is the developer platform. Building real product features requires the API, not ChatGPT subscriptions.

Can you build voice agents with OpenAI?

Yes. GPT-4o Realtime API enables sub-300ms voice agents. We integrate with telephony providers (Vapi, Retell, LiveKit) for production phone agents.

How much does OpenAI usage cost in production?

$0.001-$0.50 per interaction depending on model and complexity. With batch API, model routing, and prompt caching we typically cut costs 70-90% vs naive implementations.

Do you do custom GPTs?

Yes. We build custom GPTs with real Actions connecting to your CRM, booking system, or knowledge base. Not prompt wrappers.

Which model do you recommend?

Depends on the task. GPT-5 for hard reasoning, GPT-4o for multimodal, GPT-4o-mini for high-volume cheap work. Most production apps use multiple models routed by complexity.

Related Services

AI Agents

Production AI agents on any model.

Learn more

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Anthropic stack specialists.