Ranked comparison

LLM API: One Integration, Every Major Model

You should not need six SDKs, six billing accounts, and six error-handling paths to use six models. A unified LLM API gives you one key for all of them.

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Credit-based pay-per-use with token-settled billing. No monthly subscription. Paid credits never expire.

Replace multiple AI subscriptions with one wallet that includes routing, failover, and optimization.

First success in 60 seconds
Step 01Sign up in 10 secondsGet 20 free creditsStep 02Open your dashboardCreate API keyStep 03Send first requestRun a sample
Why teams start here first
No monthly subscription
Pay-as-you-go credits
Start with trial credits, then buy only what you consume.
Failover safety
Production-ready routing
Auto fallback across providers when latency, quality, or reliability changes.
Data control
Your policy, your choice
BYOK and zero-retention mode keep training and storage scope explicit.
Single API experience
One key, multi-provider access
Use Chat/Compare/Blend/Judge/Failover from one dashboard.
Evaluation criteria
Model coveragePricing transparencyReliability and uptimeDeveloper experienceUnique capabilities
1
LLMWiseLLMWise

Not just a proxy - it actually does things other APIs cannot. Send the same prompt to four models at once and see results stream in parallel. Or let one model critique another's output. Or blend multiple responses into a single synthesis. These are native API operations, not hacks.

Multi-model orchestration built into the API, not bolted onAuto-routing picks the best model per request with zero configurationBYOK support - use your own provider keys and skip credit charges
2
OpenRouterOpenRouter

The widest model selection - 300+ models including niche and fine-tuned variants. The 5% markup is reasonable for the convenience. Best for prototyping when you want to try many models quickly.

Largest model catalog of any unified APIOpenAI-compatible format for easy migrationCommunity-driven pricing transparency
3
Together AITogether AI

The best option for open-source model inference. Fast hosting of Llama, Mistral, and other open models with fine-tuning support. Not a gateway - you are using Together's infrastructure, not routing to other providers.

Fast inference for open-source modelsFine-tuning and custom model hostingCompetitive pricing on open models
4
Fireworks AIFireworks AI

Optimized for throughput. If you need to process large batches of LLM requests fast, Fireworks' infrastructure is tuned for high-volume workloads.

Throughput-optimized inference infrastructureFunction-calling and structured output supportCompetitive per-token pricing at scale
5
GroqGroq

The fastest inference available. Groq's custom LPU hardware delivers sub-100ms time-to-first-token on supported models. Limited model selection but unbeatable speed for real-time applications.

Custom LPU hardware for ultra-fast inferenceSub-100ms TTFT for supported modelsFree tier available for experimentation
Evidence snapshot

LLM API: One Integration, Every Major Model scoring method

Ranking evidence from practical criteria teams use for real production traffic.

Criteria
5
evaluation dimensions used
Models ranked
5
candidates evaluated
Top pick
LLMWise
current #1 recommendation
FAQ coverage
4
selection objections addressed
Our recommendation

LLMWise is the best choice for teams building production AI features that need reliability, cost control, and multi-model orchestration. OpenRouter is the fastest way to experiment with many models. Together AI and Fireworks AI are best for open-source model inference. Groq wins on raw speed.

Use LLMWise Compare mode to verify these rankings on your own prompts.

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Common questions

What is a unified LLM API?
A unified LLM API provides a single endpoint and API key to access models from multiple providers - OpenAI, Anthropic, Google, Meta, and others. Instead of managing separate integrations, you call one API and specify which model you want. This simplifies billing, error handling, and model switching.
Is there a free LLM API?
Several options exist. LLMWise includes trial credits on signup. OpenRouter has free open-source model variants. Groq offers a free tier for low-volume usage. The honest answer is that sustained production usage always requires payment - LLM inference is expensive, and truly free APIs are not sustainable at scale.
What is the cheapest LLM API?
For pay-per-token pricing, Together AI and Fireworks AI offer competitive rates on open-source models. LLMWise's auto-routing saves 25-40% by directing simple queries to cheaper models automatically. The cheapest option depends on your volume and model requirements.
Can I use my existing OpenAI code with a unified LLM API?
Most unified APIs support OpenAI-compatible message format (role + content). LLMWise and OpenRouter both accept the same message structure, so migration is typically a matter of changing the endpoint URL and API key, not rewriting prompts or code.

One wallet, enterprise AI controls built in

Credit-based pay-per-use with token-settled billing. No monthly subscription. Paid credits never expire.

Replace multiple AI subscriptions with one wallet that includes routing, failover, and optimization.

Chat, Compare, Blend, Judge, MeshPolicy routing + replay labFailover without extra subscriptions
Start free with 20 creditsSee pricing examples
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Related pages
LLM Proxy: One Endpoint, Every AI ProviderLLM Orchestration: Build Multi-Model AI PipelinesGeneric LLM GatewaysOpenRouterLiteLLMAI Sandbox: Test Every Major LLM in One Place