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From Strategy to Code

Services/Delivery & Engineering/AI & Data Engineering

OpenAI Integration Specialists · GPT-4o, GPT-5, Function Calling, Production

OpenAI integrations for products that need the latest GPT model surface — function calling, structured outputs, embeddings, vision, and the Realtime API. Built with the operational discipline that turns AI demos into AI products.

OpenAIGPT-4oGPT-5Function CallingEmbeddingsRealtime
Why HXRL

Our point of view

OpenAI's API surface evolves faster than any other vendor's. We track the changes (Responses API, structured outputs, agent SDK) and ship with the current primitives — not the ones that were current when the project started.

Outcome

OpenAI-powered features that ship reliably and stay within the cost envelope predicted at proposal stage.

What we ship

OpenAI Integration

Concrete deliverables — not adjectives. Each engagement scopes which of these are in play and what success looks like for them.

01OpenAI integration with structured outputs and function calling
02Embeddings and vector search pipelines
03OpenAI Realtime API for voice agents
04Vision and document understanding workflows
05Cost telemetry and rate-limit handling
FAQ

Questions clients actually ask

Drawn from sales calls, not SEO filler. Want a question added? Drop it in the form on this page — we update from real enquiries.

GPT-4o, GPT-5, or smaller models?+

GPT-5 for high-stakes reasoning. GPT-4o for general-purpose with cost discipline. Smaller models (GPT-4o-mini, o-class) for batch or latency-sensitive paths. We benchmark and route.

Structured outputs — when do you use them?+

Always for any output that downstream code parses. Hand-written JSON parsing of LLM output is a 2023-era pattern.

OpenAI direct or through a gateway?+

Vercel AI Gateway for multi-provider, observability, and failover. OpenAI direct only when the gateway adds latency we can't afford.

Cost control — what do you do?+

Token budgets per request type, prompt-caching where supported, embedding-cache reuse, and CI cost-regression tests. AI features sneak past finance otherwise.

Get in touch

Talk to a senior engineer about OpenAI Integration.

No SDR funnel — your message goes to a director who can tell you, on the first call, whether we're the right partner.

Interested in
OpenAI Integration
Related specialisms

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