--- title: "LLM Development | Fine-tuning, RAG & Private LLMs | Agility" url: https://agilitytech.ai/llm-development-services description: "LLM development: fine-tuning, RAG systems, private LLM deployment, and LLM products on GPT-5, Claude Opus 4, Llama 4 & Mistral. Shipped in weeks." publisher: Agility (agilitytech.ai) --- LLM Development # LLMs Built for Your Business Fine-tuning, RAG, private deployment, LLM-powered products. End-to-end LLM engineering on GPT-5, Claude Opus 4, Llama 4, and Mistral. Delivered in 4 to 8 weeks. [Start Your LLM Project](https://agilitytech.ai/contact)[Generative AI Consulting](https://agilitytech.ai/generative-ai-consulting) 4 to 8 Weeks to Production 80% Cost Reduction via Fine-tuning 6+ LLM Families Supported 200+ AI Projects Delivered ## Full-Spectrum LLM Services Everything from model selection to production deployment, under one roof ### LLM Fine-tuning Fine-tune GPT-5, Llama 4, and Mistral on your domain data for superior accuracy and 80% lower inference costs Training data preparationLoRA / QLoRA fine-tuningRLHF alignmentModel evaluation & benchmarking ### RAG Systems Connect any LLM to your private knowledge base for accurate, grounded responses with source citations Document ingestion pipelinesChunking & embedding strategyHybrid search (BM25 + semantic)Context management & reranking ### Private LLM Deployment Deploy open-source models (Llama, Mistral, Phi) inside your own cloud. Zero data leakage, full compliance AWS / Azure / GCP deploymentvLLM & TGI servingAuto-scalingSOC2 & HIPAA ready ### LLM API Integration Integrate GPT-5, Claude Opus 4, Gemini, or any LLM into your product with robust, production-grade wrappers Retry & fallback logicPrompt versioningCost monitoringResponse caching ### Prompt Engineering & Evals Systematic prompt design and automated evaluation pipelines to maximise accuracy and minimise cost Prompt library developmentChain-of-thought & few-shot designAutomated eval suitesRegression testing ### LLM-Powered Products End-to-end AI product development, from idea to production SaaS powered by the latest LLMs Full-stack developmentMulti-tenant architectureBilling integrationAnalytics & dashboards ## Every Major LLM Supported We're model-agnostic: we pick the best LLM for your use case, budget, and compliance requirements OpenAI ### GPT-5 / GPT-5 mini Complex reasoning, tool calling, vision Anthropic ### Claude Opus 4 / Sonnet 4 Long context, analysis, safety-critical apps Google ### Gemini 2.5 Pro / Flash Multimodal, large context windows Meta (Open Source) ### Llama 4 (open weights) Private deployment, fine-tuning, cost-sensitive Mistral AI (Open Source) ### Mistral / Mixtral Fast inference, European data residency Microsoft / Alibaba ### Phi-4 / Qwen Edge deployment, low-resource environments ## LLM Projects We've Shipped [Legal Tech ### Challenge Contract review taking senior lawyers 4 to 6 hours per document, limiting throughput ### Solution Fine-tuned Llama 3 model trained on 10,000 contracts, highlights risk clauses and deviations from standard terms ### Results Review time: 4 hours → 12 minutes. 98% clause detection accuracy. Timeline 6 weeks to production Read more](https://agilitytech.ai/case-studies/insurance-automation)[Healthcare ### Challenge Clinical notes unstructured and inconsistent, making data analysis impossible ### Solution Custom RAG system with fine-tuned medical NLP model extracting structured data from free-text notes ### Results 40% improvement in early risk detection. HIPAA compliant, deployed on private AWS. Timeline 8 weeks to production Read more](https://agilitytech.ai/case-studies/healthcare-ai)[E-commerce ### Challenge Product catalogue of 500K+ items with inconsistent, low-quality descriptions hurting conversion ### Solution Batch LLM pipeline generating SEO-optimised descriptions at scale, with brand voice fine-tuning ### Results 10x faster catalogue updates. 18% increase in organic product page traffic. Timeline 4 weeks to production Read more](https://agilitytech.ai/case-studies/retail-analytics) ## From Data to Production LLM 01 ### Model Selection & Architecture Choose the right model, hosting strategy, and architecture based on your accuracy, cost, and compliance requirements 3 to 5 days 02 ### Data Preparation Clean, format, and augment your training or retrieval data. The most critical step for performance 1 to 2 weeks 03 ### Build & Train Fine-tuning, RAG pipeline construction, or product integration, with continuous evaluation throughout 2 to 5 weeks 04 ### Deploy & Monitor Production deployment with latency monitoring, cost tracking, and model drift detection 1 week ## Ready to Build with LLMs? From a single-model integration to a full fine-tuned deployment. We scope it, build it, and ship it. [Discuss Your LLM Project](https://agilitytech.ai/contact)[OpenAI / GPT Development](https://agilitytech.ai/openai-gpt-development) Keep exploring ## Explore related AI services The rest of Agility's AI engineering and consulting services. ### Hire AI Developers Senior, pre-vetted ML, LLM, data and MLOps engineers. Dedicated teams or staff augmentation. [Learn more](https://agilitytech.ai/hire-ai-developers) ### Generative AI Consulting RAG pipelines, AI agents and LLM integration, from strategy through to production. [Learn more](https://agilitytech.ai/generative-ai-consulting) ### Custom AI Development Bespoke AI solutions designed and built to your specification. [Learn more](https://agilitytech.ai/custom-ai-development) ### AI Consulting India Global AI delivery from our India hubs. [Learn more](https://agilitytech.ai/ai-consulting-india) ### AI Consulting Ahmedabad Local AI expertise in Ahmedabad, Gujarat. [Learn more](https://agilitytech.ai/ai-consulting-company-ahmedabad) ### AI Consulting USA AI consulting and delivery for US enterprises. [Learn more](https://agilitytech.ai/ai-consulting-company-usa) ### AI Consulting for Healthcare Clinical decision support, medical document AI, and HIPAA-compliant ML for health systems. [Learn more](https://agilitytech.ai/ai-consulting-healthcare) ### AI Consulting for Insurance Claims automation, fraud detection, and underwriting AI for P&C, life, and health insurers. [Learn more](https://agilitytech.ai/ai-consulting-insurance) ### AI Consulting for Logistics Route optimization, demand forecasting, and warehouse AI for supply chain operators. [Learn more](https://agilitytech.ai/ai-consulting-logistics)