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Integrating GPT-5, Claude Opus 4.8, Gemini 3, Llama 4 & More via One API
15 posts on integrating gpt-5, claude opus 4.8, gemini 3, llama 4 & more via one api — part of api integration on the n4n AI blog.
Why unified APIs beat maintaining five separate LLM SDKs
Analyzing unified api vs multiple sdks for LLM integration: maintenance, fallback, and tradeoffs for teams shipping GPT-5, Claude, Gemini, and Llama.
Routing requests across GPT-5, Llama 4, and DeepSeek V4
Step-by-step guide to route requests gpt-5 llama 4 deepseek v4 through one OpenAI-compatible API, with fallback, caching, and metering.
One schema, many models: normalizing GPT-5 and Gemini 3 replies
Step-by-step guide to normalize LLM API responses from GPT-5 and Gemini 3 into one schema, with Python mappers, streaming, and pitfalls.
Migrating from the OpenAI SDK to a unified LLM gateway
Practical steps to migrate OpenAI SDK to a unified LLM gateway for GPT-5, Claude, Gemini, and Llama with fallback and per-token metering.
How OpenAI-compatible APIs let you swap GPT-5 for Llama 4
An OpenAI-compatible API swap models approach lets you replace GPT-5 with Llama 4 by changing a config string, not code, avoiding lock-in.
Handling rate limits across GPT-5, Claude Opus 4.8, and Gemini 3
Practical steps to handle rate limits multiple LLM APIs across GPT-5, Claude Opus 4.8, and Gemini 3 with a unified OpenAI-compatible gateway.
Comparing API formats: GPT-5, Claude Opus 4.8, Gemini 3, Llama 4
Head-to-head comparison of GPT-5, Claude Opus 4.8, Gemini 3, Llama 4 API formats across capabilities, cost, latency, ergonomics.
Building a model-agnostic chat app with GPT-5 and Claude
Hands-on tutorial: build a model-agnostic chat app with GPT-5 and Claude via one OpenAI-compatible endpoint. Runnable Node.js code, prerequisites, and output.
Automatic failover between GPT-5 and Claude Opus 4.8, explained
Automatic failover between GPT-5 and Claude Opus 4.8 routes requests to the healthy model on errors, ensuring uptime without code changes. Explained.
Unified API vs. calling GPT-5, Claude, and Gemini separately
Engineering comparison of unified API vs separate LLM SDKs for GPT-5, Claude Opus 4.8, and Gemini 3: capabilities, pricing, latency, ergonomics, ecosystem, and limits.
Switching between GPT-5 and Claude Opus 4.8 without new code
Learn how to switch GPT-5 and Claude Opus 4.8 without code changes using one OpenAI-compatible API endpoint and env-var model routing step-by-step.
One API for GPT-5, Claude Opus 4.8, Gemini 3, and Llama 4
A practical guide to building with a unified API for GPT-5, Claude Opus 4.8, Gemini 3, and Llama 4—covering setup, routing, fallback, and pitfalls.
How a unified API simplifies multi-model LLM integration
A unified LLM API definition explains a single interface abstracting multiple model providers. Learn how it works, why it matters, and see code examples.
Building a fallback chain across GPT-5, Gemini 3, and Llama 4
Build a client-side llm fallback chain across GPT-5, Gemini 3, and Llama 4 with OpenAI-compatible APIs, including step-by-step Python code.
A single Python client for GPT-5, Claude Opus 4.8, and Gemini 3
Hands-on tutorial: build one Python client to call GPT-5, Claude Opus 4.8, and Gemini 3 via an OpenAI-compatible gateway, with streaming and fallback.
More topics in api integration
- Function Calling Fundamentals27
- Structured Outputs & JSON Mode19
- cURL LLM API Cookbook15
- Next.js AI Chat Integration (App Router + Vercel AI SDK)15
- FastAPI LLM Backend Integration14
- Go net/http LLM API Client14
- LangChain + OpenAI-Compatible Gateway Integration14
- Node.js OpenAI-Compatible SDK Integration14
- Python + OpenAI-Compatible SDK Integration14
- Rate Limits, Retries & Backoff Strategies14
- React Streaming Chat UI Patterns14
- Server-Sent Events (SSE) Streaming Deep Dive14