Best OpenAI-Compatible API Endpoints
Switch providers without changing your code. These APIs use the exact same format as OpenAI — just change the base URL and API key. Drop-in replacements that save you money and give you model flexibility.
🤔 Why Use OpenAI-Compatible Endpoints?
Three reasons developers are switching from direct OpenAI API usage.
Save 50-90% on Costs
OpenAI charges $2.50-$15.00 per million tokens. Together AI and DeepSeek offer equivalent quality at $0.27-$0.90 per million. Same SDK, fraction of the cost.
Model Flexibility
OpenRouter gives you 200+ models through one endpoint. A/B test Claude, Llama, GPT, and Gemini without changing SDKs or integration code.
Free Tiers Available
NVIDIA NIM (40 RPM free), Groq (30 RPM free), and Google Gemini (1500 RPM free) all offer OpenAI-compatible endpoints at zero cost.
🧩 Top OpenAI-Compatible Providers
15 providers with drop-in OpenAI SDK compatibility.
OpenAI
GPT-4.1, GPT-4o, o3, o4-mini. Industry standard for LLM APIs.
Google Gemini
Gemini 2.5 Pro, 2.0 Flash. Free tier via AI Studio with generous quotas.
Groq
Llama 3.3 70B, Mixtral, Gemma2. Ultra-fast inference with LPU hardware.
Together AI
Llama 3.x, Qwen2.5, DeepSeek. Great pricing and throughput.
Cohere
Command R+, Command R. Enterprise-grade NLP with RAG focus.
Fireworks AI
Llama 3.x, DeepSeek V3/R1. Fast serverless inference at scale.
DeepSeek
DeepSeek V3, R1. Extremely cost-effective and powerful open models.
xAI (Grok)
Grok-3, Grok-3-mini. Real-time knowledge with X integration.
Cerebras
Llama 3.3 70B at ultra-fast speeds. Wafer-scale engine.
Novita AI
Llama, Qwen, DeepSeek. Pay-per-use with competitive pricing.
AnyScale
Llama 3, Mixtral, CodeLlama. Scalable Ray-based inference.
Lepton AI
Llama 3.1, Nous Hermes, WizardLM. GPU cloud with simple API.
Ollama
Run any open model locally. Free, unlimited, offline.
LM Studio
Desktop app for running local models. Simple GUI + API.
OpenRouter
Aggregator for 200+ models. Pay-per-token, no subscription needed.
📋 All OpenAI-Compatible Deals
Top verified deals using OpenAI-compatible endpoints.
Groq — Llama 3.3 70B Free API
CompatibleDeepSeek — V3 API (0.27$/M input tokens)
CompatibleGoogle Gemini — 2.0 Flash Free
CompatibleGoogle Gemini — 2.5 Pro Free
CompatibleNVIDIA NIM — Llama 3.3 70B Free Tier
CompatibleOpenRouter — DeepSeek R1 (Free)
Compatible❓ Frequently Asked Questions
What does OpenAI-compatible mean?
An OpenAI-compatible API follows the same request/response format as the OpenAI API. This means you can use the official OpenAI Python/JS SDK by just changing the base_url to point to the provider. No code changes needed — it's a drop-in replacement.
Can I use these with LangChain, LiteLLM, and other frameworks?
Yes. Most LLM frameworks support OpenAI-compatible endpoints natively. For LangChain, use ChatOpenAI with the provider's base_url. For LiteLLM, most providers have built-in support. Any tool that works with the OpenAI API format will work with these endpoints.
Which OpenAI-compatible provider is the cheapest?
DeepSeek direct API ($0.27/M input) is the cheapest, followed by Fireworks AI ($0.40/M) and Together AI ($0.90/M). Free tiers from NVIDIA NIM (40 RPM) and Groq (30 RPM) are unbeatable for low-traffic apps. OpenRouter offers flexibility with pay-per-token across 200+ models.
Are there any limitations with OpenAI-compatible endpoints?
Some providers may not support all OpenAI features like function calling, streaming, or vision. However, major providers (Together AI, Groq, NVIDIA NIM, OpenRouter) support streaming, tool calling, and JSON mode. Always check provider docs for feature compatibility.
Ready to switch?
One line change in your codebase. Thousands saved. Explore all OpenAI-compatible providers now.
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