Building with AI isn't one-size-fits-all. Your industry, stack, and system maturity all change the answer. Use this framework to pick the right LLM and architecture for your pilot.
Four lenses to guide your LLM and architecture choices
Concrete paths from industry context to implementation recommendations
Quick comparison of top LLMs for application development
| Category | GPT-5 | Claude 4 | Gemini 2.5 | Llama 4 | Cohere |
|---|---|---|---|---|---|
| Strengths | Strong reasoning, function calling | Long context, safety focus | Multimodal, Google ecosystem | Open source, on-premise | Enterprise RAG, multimodal |
| Context Window | Not publicly specified | Varies by tier | 2M+ tokens (Gemini 2.5 Pro) | Varies by variant | Varies by tier |
| Modalities | Text, images, audio | Text, images | Text, images, audio, video | Text (multimodal variants) | Text, images (Command A Vision) |
| Best For | Complex reasoning, APIs | Long documents, safety | Multimodal apps, Google Cloud | On-premise, cost control | Enterprise RAG, vision tasks |
| Guardrails | Built-in safety | Constitutional AI | Safety filters | Custom implementation | Enterprise controls |
| Notes | Launched Aug 2025 | Opus 4 / Sonnet 4 variants | 2.5 Pro flagship model | Scout/Maverick variants | Command A Vision (Jul 2025) |
Common patterns for integrating LLMs into existing systems
When to use: Existing monoliths that need AI capabilities without major refactoring. Perfect for healthcare, finance, and legacy enterprise systems.
Key considerations: Add API gateway for request routing, deploy LLM service as sidecar, implement dedicated vector storage, and ensure comprehensive monitoring for compliance requirements.
When to use: Modern microservices architectures with existing API ecosystems. Ideal for CRM, SaaS platforms, and API-first applications.
Key considerations: Use orchestrator for complex workflows, implement tool-calling for external integrations, leverage event-driven patterns for real-time updates, and maintain service boundaries for scalability.
• GPT-5: OpenAI GPT-5 Announcement (Aug 7, 2025) | Product Page
• Claude 4: Anthropic Claude 4 Announcement (May 22-23, 2025) | Opus 4 & Sonnet 4 variants
• Llama 4: Meta AI Blog (Apr 5, 2025) | Scout & Maverick variants
• Gemini 2.5 Pro: Google DeepMind Gemini | 2M+ token context window
• Cohere Command A Vision: Cohere Docs (Jul 31, 2025) | Multimodal enterprise model
Model specifications and capabilities are subject to change. Always refer to official vendor documentation for the most current information.