Fordel StudiosInfrastructure that runs AI workloads without surprising your budget.
Direct API calls to hosted models are the right starting point — until unit economics break. The transition from managed APIs to hybrid or self-hosted inference is the inflection point most teams underestimate. We design infrastructure with that transition in mind: proper cost instrumentation from day one, separation of inference and application tiers, and deployment patterns that support incremental migration without downtime.
The inference cost crisis has a simple shape: LLM API pricing is linear with token volume, and product margins often are not. Teams that built on GPT-4 API calls at prototype scale discover at production scale that the cost model does not work for their unit economics. The infrastructure response is not just "use a cheaper model" — it is understanding the full optimization surface: model routing, semantic caching, quantization, batch processing, and the self-hosting crossover point.
vLLM (UC Berkeley, open source) and TGI (Text Generation Inference, HuggingFace) changed the self-hosting calculus by making high-throughput LLM serving on commodity GPU hardware practical. vLLM's PagedAttention algorithm dramatically improves GPU memory utilization. INT4 and INT8 quantization reduces model memory footprint by 4-8x with manageable accuracy trade-offs on many tasks. The crossover point where self-hosting beats API pricing is now within reach for workloads that were API-only two years ago.
| Architecture decision | Common anti-pattern | Right-sized approach |
|---|---|---|
| LLM inference | One large GPU instance, always-on | Auto-scaling with spot fallback, right-sized per model |
| Model serving | Raw HuggingFace inference | vLLM or TGI for throughput, quantized for memory efficiency |
| API vs self-hosted | API for everything | API for low-volume/complex, self-hosted for high-volume/simple |
| Training pipelines | Sequential steps, one machine | Orchestrated DAG with checkpointing and spot instance support |
| Observability | Cloud default metrics | Custom: tokens/sec, latency P95, cost/request, GPU utilization |
We design infrastructure architectures that separate training infrastructure (GPU-heavy, bursty, latency-tolerant) from inference infrastructure (latency-sensitive, auto-scaling, different instance families). This separation lets each be optimized independently. Training runs on spot instances with checkpointing for cost efficiency. Inference runs on auto-scaled on-demand instances sized to measured P95 latency targets.
AI infrastructure layers we build
Profile your actual latency and throughput requirements. Model the cost at current and projected volume for API, self-hosted vLLM/TGI, and quantized variants. Select the architecture that meets latency requirements at acceptable cost.
Deploy vLLM or TGI for self-hosted LLM serving with INT4/INT8 quantization where accuracy trade-offs are acceptable. Configure PagedAttention, continuous batching, and auto-scaling to maximize throughput per GPU.
Kubernetes (EKS, GKE, AKS) for multi-service deployments. Simpler workloads on Cloud Run or ECS. Model serving on SageMaker or Vertex AI where managed scaling is worth the abstraction cost.
Model updates are deployment events with the same canary rollout, evaluation gates, and automated rollback as application deployments. A model that degrades performance on eval triggers rollback before production traffic switches.
Custom metrics for AI workloads: tokens/second, latency P95, cost/request, GPU utilization. Budget alerts by workload type, idle resource detection, and spot instance savings tracking. Cost visibility is built in on day one.
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vLLM and TGI model serving
We deploy vLLM with PagedAttention and continuous batching, or TGI for HuggingFace-native models, depending on your model family and serving requirements. Both consistently outperform naive single-request inference in throughput-per-GPU at production concurrency levels. We configure INT4 or INT8 quantization where the accuracy delta is acceptable for your use case — which we verify against your eval set before deployment.
- 02
Inference cost modeling
Before recommending self-hosted vs. API, we model both at your current volume and at 5x and 10x projections. The crossover point is a function of model size, requests per day, and hardware amortization — it's not the same answer for every team. You get a spreadsheet with the assumptions visible before we touch any infrastructure.
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AI workload infrastructure patterns
Model artifact versioning in S3 or GCS, inference endpoint auto-scaling with cold-start latency tuned to your SLA, and training pipeline orchestration with spot instance support and checkpoint/resume for fault tolerance. We integrate feature stores where training/serving skew is a risk — specifically when the same features are computed differently at training time and inference time.
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Deployment automation with eval gates
Model deployments follow canary rollout patterns — traffic shifts incrementally from the previous checkpoint to the new one, with automated rollback on latency or error rate regression. Eval gates run against a held-out benchmark before any traffic shift; a model that regresses on your defined metrics doesn't reach production regardless of deployment schedule. This is the same pipeline discipline we apply to application code, adapted for model artifacts.
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Infrastructure as code
Every resource is defined in Terraform or AWS CDK — nothing is created manually in the console. That means reproducible environments, a reviewable change history, and the ability to recreate the entire stack from scratch in a new region or account. We treat drift from IaC as a defect, not an operational convenience.
- AI infrastructure architecture doc with cost model at current and 10x scale
- vLLM or TGI serving setup with quantization and auto-scaling config
- Terraform or CDK covering every provisioned resource
- CI/CD pipeline with model deployment automation and eval gates
- Observability stack: AI-specific metrics, dashboards, and distributed tracing
- Cost governance: tagging taxonomy, budget alerts, and spot instance config
Teams moving from naive API-for-everything to a modelled hybrid typically reduce per-token serving cost by 40–70% at the same throughput, while improving P99 latency. The bigger win is predictable unit economics that don't break when traffic grows.
Frequently
asked questions
When does self-hosting with vLLM beat OpenAI API pricing?
It depends on model size, request volume, and latency requirements. The crossover point is lower than most teams expect for high-volume workloads on smaller models. We model the cost for your specific volume before recommending — quoting a generic crossover point is not useful because the variables matter significantly. The analysis covers model serving cost, operational overhead, and the engineering time to maintain self-hosted infrastructure.
What does INT4/INT8 quantization actually cost in quality?
Quantization trade-offs are task-dependent. For classification, extraction, and summarization tasks, INT8 quantization typically produces negligible quality degradation. INT4 is more aggressive and requires evaluation on your specific task. We recommend measuring against your eval dataset before quantizing production models — not relying on benchmark numbers that may not match your use case.
Managed ML platforms (SageMaker, Vertex AI) or self-hosted Kubernetes?
Managed platforms reduce operational overhead significantly and are appropriate for most production workloads. Self-hosted Kubernetes makes sense when you have specific customization requirements, existing Kubernetes expertise, or data residency constraints. The managed vs. self-managed cost difference has narrowed as managed platforms matured — factor in engineering time to operate self-managed infrastructure.
Do you handle ongoing infrastructure management?
We design, build, and hand off with documentation and runbooks. Ongoing retainer-based infrastructure support is available for teams without in-house DevOps capacity. The infrastructure-as-code approach means ongoing maintenance is incremental and transparent rather than tribal knowledge.
Ready to get started?
Tell us what you are building. We will scope it, price it honestly, and give you a clear plan.
Free 30-min scoping call