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TechCirkle · LLM Integration Services

LLM INTEGRATION
Services.

Getting GPT-4 to do something is easy. Getting it to do the same thing reliably, at scale, without your costs spiraling or the model quietly changing under you, is the hard part. That is the part we build.

Model Routermodel dispatched
task › classify support ticket category
Selected$0.0003/call340ms
GPT-4o mini
simple classification · high volume · cheap wins
Not usedGPT-4o would cost 30× more — no benefit on this task
GPT-4o · Claude · Gemini · Open-sourcePrompt-only · RAG · Fine-tuningProduction-hardened · not demo-ready
01Which Model for Which Job

No universally
best LLM.

There are models that fit specific jobs better than others. Here is how we pick.

01
GPT-4o
Default pick
OpenAI
Solid reasoning, fast, multimodal, well-supported tooling. The choice when you want a reliable workhorse and do not have a reason to pick something else.
General-purposeMultimodalReliable default
02
GPT-4o mini
OpenAI
Often 90 percent of the quality at 5 percent of the cost. Classification, simple extraction, formatting jobs where the smarter model is overkill.
ClassificationSimple extractionHigh-volume pipelines
03
Claude Sonnet & Opus
Anthropic
When reasoning matters more than speed, or when you want a model more cautious by default. Refuses rather than guesses — strong for analysis and document work.
Document analysisLong contextHigh-stakes reasoning
04
Gemini
Google
For multimodal work where images, video, or extremely long context windows are central. Strong integration with the Google ecosystem.
Image & videoVery long contextGoogle ecosystem
05
Llama · Mistral · Qwen
Open-source
When privacy, cost at scale, or full control matters more than frontier capability. Hosted in your cloud, never sending data to a third party.
Sensitive dataCost at scaleFine-tunable
06
Specialised Models
Embedding · Speech · Vision
For embedding (OpenAI, Voyage, Cohere), speech (Whisper, Deepgram), vision, and tasks where a foundation LLM is the wrong tool entirely.
Vector embeddingsTranscriptionVision tasks

Most production systems we build use two or three of these together. A cheap fast model for the easy work, a smarter model for the hard cases, and an open-source fallback for sensitive data.

02Three Integration Patterns

Architecture matters
more than model.

The architecture you pick is more important than the model. Three patterns cover most of what we build.

Simplest integration
Prompt only

You send a prompt, you get a response. Good for stateless, generic tasks where the model already knows what it needs. Summarisation, simple classification, text rewriting, format conversion. Cheapest to ship. Fragile at edge cases.

Cheapest to ship
Fragile at edge cases
Often the right starting point — sometimes the ending point
When prompting is not enough
Fine-tuning

When you need a specific style, tone, or capability the base model cannot reliably produce. More expensive, more involved, and you now manage a custom model. We recommend it sparingly — after the first two patterns have been tried.

Consistent custom style or tone
After RAG has been tried first
Roughly one in ten projects
03Where Integrations Break

The same problems,
every time.

We have seen these enough times to flag them before they happen to you.

01
Hallucination as confidencemost common

The model invents an answer and presents it like fact. Often undetectable without domain expertise.

Grounding in real data · designing the system to refuse rather than guess.

02
Token cost spiralfinancial risk

A feature that worked fine in testing costs thousands a month at real scale.

Caching repeated queries · right model per task · spend controls per tenant or user.

03
Latency that ruins UXuser-facing failure

Two seconds is fine in chat. Unacceptable in a real-time search box or product flow.

Streaming responses · prefetching · faster models on latency-sensitive paths.

04
Model changing under yousilent breakage

The provider updates the model. Prompts that worked now produce different output.

Pinning to specific model versions · evaluation sets that detect drift · upgrading on your schedule.

05
No fallback when the API is down3am outage

OpenAI goes down. Anthropic has an incident. Your AI feature stops working.

Fallback model from a different provider · graceful degradation that does not look broken.

04The Production Layer Most Teams Skip

What separates
demos from features.

The gap between a demo that wows and a feature that holds up is mostly the engineering around the model, not the model itself.

Cost & performance
Caching

Repeated identical queries should not hit the model twice. Saves cost, reduces latency. Trickier than it sounds when prompts include user data.

Perceived speed
Streaming

Responses appearing as they generate, rather than waiting for the full answer, transforms perceived speed. Non-negotiable for user-facing features.

Reliability
Fallback models

Primary provider down or rate-limited — fall back to another. The user does not notice. The on-call engineer is not paged at 3am.

Debuggability
Observability

Every prompt, response, latency, and cost logged. Traces so you can debug what happened on that one weird call. Evaluation runs against a golden set.

Financial control
Cost controls

Per-user, per-tenant, per-feature spend limits with alerts before things get expensive. Non-negotiable at any meaningful scale.

Engineering discipline
Prompt versioning

Prompts are code. Version-controlled, tested, and rollable like any other code. This is where most side projects differ from production features.

05Privacy & Data Handling

Your data stays
where you decide.

LLM providers have come a long way on enterprise data handling, but the details matter and they change.

Enterprise cloud
Provider enterprise plans

OpenAI, Anthropic, and Google all offer enterprise plans where your data is not used for training, with zero-retention options. We help you negotiate the right tier and verify the contract terms match your compliance needs.

Data not used for training
Zero-retention options available
Enterprise SLAs
Self-hosted
Your own cloud

Open-source models (Llama, Mistral, Qwen) on AWS Bedrock, Vertex AI, or self-hosted in your VPC. Your data never leaves your environment. We recommend this when privacy, compliance, or cost makes it the right call.

Data never leaves your VPC
AWS · GCP · Azure
Fine-tunable to your use case
Regulated industries
HIPAA · GDPR · SOC 2

For healthcare, finance, and legal, we build with the assumption that audit, encryption, and data residency are not afterthoughts. We have built systems satisfying these requirements with LLM features inside them.

Healthcare · Finance · Legal
Audit logging by default
Data residency controls
06The LLM Integration Stack

What we
build with.

Chosen based on project requirements — not defaulted to the most popular option.

01
Model Providers
OpenAI and Anthropic for most production work · Bedrock and Vertex AI for managed open-source · Together AI and Groq for fast inference on open-source models
OpenAIAnthropicGoogleAWS BedrockVertex AITogether AIGroq
02
Orchestration
LangChain for orchestration-heavy projects · LangGraph for stateful multi-step flows · Direct SDK calls when frameworks add unnecessary weight
LangChainLangGraphDirect SDK
03
Retrieval
Hybrid search combining vector and keyword (BM25) for better results than either alone · pgvector for teams already on Postgres
PineconeWeaviatepgvectorBM25 hybrid
04
Evaluation
Golden sets, regression tests, A/B comparisons across models and prompts — so you know when a change made things worse
LangSmithBraintrustCustom harnesses
05
Observability
Helicone for lightweight cost and latency tracking · LangSmith for detailed traces · Datadog with custom dashboards at scale
HeliconeLangSmithDatadogCustom dashboards
06
Application Layer
Python with FastAPI for AI services · Node and Next.js for product integrations · Postgres for application data, vector DB for embeddings
Python / FastAPINode / Next.jsPostgresVector DB
07Case Studies

Recent LLM
integration work.

We are documenting recent work — covering the problem, the architecture, and the measurable result.

⊠ In preparation
Case Study 01In preparation

Multi-model production system

GPT-4o for the smart work, GPT-4o mini for high-volume classification, and Llama as the privacy-preserving fallback. Three models, one coherent system.

Full case study coming soon
⊠ In preparation
Case Study 02In preparation

RAG-grounded knowledge access

A retrieval-augmented LLM feature built on internal documents, with citations and refusal patterns to eliminate hallucination.

Full case study coming soon
⊠ In preparation
Case Study 03In preparation

Latency-critical integration

An LLM feature in a real-time product flow where streaming, caching, and prefetching mattered more than the model choice.

Full case study coming soon
08Common Questions

Questions about
LLM integration.

Depends on the job. For most general production work, GPT-4o is a sensible default. For long-document analysis or careful reasoning, Claude. For multimodal or huge context, Gemini. For privacy and cost at scale, open-source like Llama. We will recommend based on what you are actually building.

The build cost is usually a few weeks of work for a focused integration, more for a system spanning multiple features. The interesting number is the running cost, which depends on usage volume, model choice, and how well the system is engineered. We model the per-month cost as part of scoping so there are no surprises.

When it helps. LangChain is useful for orchestration-heavy projects, particularly agentic workflows. For simpler integrations, direct SDK calls are often cleaner and easier to debug. We pick based on the project, not loyalty to a framework.

Yes. We deploy open-source models (Llama, Mistral, Qwen) on AWS Bedrock, Vertex AI, or self-hosted in your VPC. Your data stays in your environment. We will recommend this when privacy, compliance, or cost makes it the right call.

Your prompts may produce different output. We protect against this by pinning to specific model versions where possible, running evaluation sets that detect drift, and upgrading on your schedule rather than reacting in panic. The change is not a surprise.

RAG retrieves relevant context at query time and grounds the model’s answer in your data — no training required, works immediately on new data. Fine-tuning bakes a specific style or capability into the model through additional training. We default to RAG and recommend fine-tuning sparingly, after RAG has been tried.

Ready when you are

Tell us what you want the model to do.

Tell us what you want the model to do, where it fits in your product, and what success looks like. We will come back with a real architecture, a real cost model, and a real plan.

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