Managing separate API keys for OpenAI, Anthropic, Google, and DeepSeek is one of the biggest pain points for AI developers in 2026. AI API aggregator platforms solve this by providing a single endpoint and API key to access hundreds of models.
I tested 10 platforms over the past month across three criteria: model coverage, pricing transparency, and developer experience. Here's the ranking.
What Is an AI API Aggregator?
An AI API aggregator (also called an AI API gateway or unified AI API) sits between your application and multiple AI providers. You get:
- One API key for all models
- One billing account instead of managing 5-10 provider accounts
- Unified API format (usually OpenAI-compatible)
- Automatic failover when a provider goes down
The 10 Best AI API Aggregator Platforms (Ranked)
1. Crazyrouter
Website: crazyrouter.com
Crazyrouter provides access to 627+ models across 102 model families from 20+ providers. It stands out for having the broadest model coverage of any aggregator I tested, including hard-to-find models from ByteDance (Doubao, Seedance), Alibaba (Qwen3), and xAI (Grok).
| Feature | Detail |
|---|---|
| Models | 627+ across 102 families |
| API Format | OpenAI, Anthropic, and Gemini compatible |
| Pricing | Pay-as-you-go, below official rates |
| Free Credit | $0.20 on signup |
| Global Nodes | 7 regions (US, Japan, Korea, UK, HK, PH, RU) |
| Capabilities | Chat, vision, image gen, video gen, music, TTS, STT, embeddings |
Why it ranks #1: Broadest model coverage, multi-format API support (not just OpenAI-compatible), and consistently lower pricing than going direct. The 7 global edge nodes also give it the best latency profile for international teams.
Quick start:
from openai import OpenAI
client = OpenAI(
base_url="https://crazyrouter.com/v1",
api_key="sk-your-crazyrouter-key"
)
response = client.chat.completions.create(
model="gpt-5",
messages=[{"role": "user", "content": "Hello"}]
)
2. OpenRouter
Website: openrouter.ai
The most well-known aggregator with 300+ models. Strong community, good documentation, and OAuth support for user-facing apps.
| Feature | Detail |
|---|---|
| Models | 300+ |
| API Format | OpenAI-compatible |
| Pricing | Pay-per-token + 5% BYOK fee |
| Free Models | Yes (limited selection) |
Strengths: Large community, free tier, well-documented.
Weaknesses: 10-30% markup on popular models, US-only infrastructure, no native Anthropic/Gemini format support.
3. AIMLAPI
Website: aimlapi.com
Offers 400+ models covering chat, image, video, audio, and 3D generation. Good for teams that need multimodal capabilities beyond text.
| Feature | Detail |
|---|---|
| Models | 400+ |
| API Format | OpenAI-compatible |
| Pricing | Pay-as-you-go |
| Capabilities | Chat, image, video, audio, voice, 3D |
Strengths: Broad multimodal coverage, competitive pricing.
Weaknesses: Less established community, documentation could be better.
4. Portkey
Website: portkey.ai
Enterprise-focused gateway with strong observability, prompt management, and compliance features. Best for teams that need production-grade monitoring.
| Feature | Detail |
|---|---|
| Models | 100+ via provider integrations |
| API Format | OpenAI-compatible |
| Pricing | Free tier + paid plans |
| Key Feature | Built-in observability and prompt versioning |
Strengths: Enterprise governance, detailed analytics, prompt management.
Weaknesses: Smaller model catalog than pure aggregators, enterprise pricing can be steep.
5. LiteLLM
Website: litellm.ai
Open-source Python library that provides a unified interface to 100+ LLMs. Can be self-hosted or used as a managed proxy.
| Feature | Detail |
|---|---|
| Models | 100+ |
| API Format | OpenAI-compatible |
| Pricing | Free (open-source) or managed plans |
| Key Feature | Self-hosting option |
Strengths: Open-source, self-hostable, no vendor lock-in.
Weaknesses: Requires infrastructure management if self-hosted, higher latency overhead than compiled alternatives.
6. Eden AI
Website: edenai.co
Specializes in multimodal AI APIs beyond just LLMs — OCR, document parsing, image analysis, translation, and more.
| Feature | Detail |
|---|---|
| Models | 500+ (including specialized AI services) |
| API Format | Custom unified API |
| Pricing | Pay-as-you-go with automatic cost optimization |
Strengths: Broadest multimodal coverage including non-LLM services.
Weaknesses: Not OpenAI-compatible format, steeper learning curve.
7. Helicone
Website: helicone.ai
Primarily an observability platform that also functions as an AI gateway. Best for teams that prioritize logging and cost tracking.
| Feature | Detail |
|---|---|
| Models | Routes to major providers |
| API Format | OpenAI-compatible proxy |
| Pricing | Free tier available |
| Key Feature | Request logging and cost analytics |
Strengths: Free observability, easy integration as a proxy layer.
Weaknesses: Not a full aggregator — you still need provider keys.
8. Bifrost (by Maxim AI)
Website: getmaxim.ai
High-performance open-source gateway built in Go. Achieves extremely low latency overhead (11 microseconds at 5,000 RPS).
| Feature | Detail |
|---|---|
| Models | 15+ providers |
| API Format | OpenAI-compatible |
| Pricing | Open-source (free) |
| Key Feature | Ultra-low latency, automatic failover |
Strengths: Best raw performance, open-source, self-hostable.
Weaknesses: Smaller model catalog, requires infrastructure setup.
9. SiliconFlow
Website: siliconflow.com
All-in-one AI cloud platform combining model hosting, inference optimization, and API aggregation. Strong in the Asian market.
| Feature | Detail |
|---|---|
| Models | Major LLMs + open-source models |
| API Format | OpenAI-compatible |
| Pricing | Competitive, especially for Asian providers |
Strengths: Optimized inference, good Asian model coverage.
Weaknesses: Less established in Western markets.
10. Unified.to
Website: unified.to
Provides unified APIs across multiple categories (not just AI), including CRM, HRIS, and accounting integrations alongside generative AI.
| Feature | Detail |
|---|---|
| Models | Major LLM providers |
| API Format | Custom unified API |
| Pricing | Subscription-based |
Strengths: Broad integration coverage beyond AI.
Weaknesses: AI is one of many features, not the primary focus.
Comparison Table
| Platform | Models | OpenAI Compatible | Self-Host | Free Tier | Best For |
|---|---|---|---|---|---|
| Crazyrouter | 627+ | ✅ + Anthropic + Gemini | ❌ | $0.20 credit | Broadest model access, international teams |
| OpenRouter | 300+ | ✅ | ❌ | ✅ | Community, free models |
| AIMLAPI | 400+ | ✅ | ❌ | ✅ | Multimodal (image/video/audio) |
| Portkey | 100+ | ✅ | ❌ | ✅ | Enterprise observability |
| LiteLLM | 100+ | ✅ | ✅ | ✅ (OSS) | Self-hosted deployments |
| Eden AI | 500+ | ❌ | ❌ | ✅ | Non-LLM AI services |
| Helicone | Proxy | ✅ | ✅ | ✅ | Logging and cost tracking |
| Bifrost | 15+ providers | ✅ | ✅ | ✅ (OSS) | Ultra-low latency |
| SiliconFlow | Major LLMs | ✅ | ❌ | ✅ | Asian market, inference optimization |
| Unified.to | Major LLMs | ❌ | ❌ | ❌ | Multi-category integrations |
How to Choose
- Maximum model coverage: Crazyrouter (627+ models) or AIMLAPI (400+)
- Free experimentation: OpenRouter (free tier with select models)
- Enterprise compliance: Portkey (governance + observability)
- Self-hosting required: LiteLLM or Bifrost
- Beyond text (OCR, translation): Eden AI
- Best performance: Bifrost (lowest latency) or Crazyrouter (global edge nodes)
- Cost tracking: Helicone (free observability layer)
Getting Started
Most aggregators support the OpenAI SDK format. Here's the general pattern — just swap the base URL and API key:
from openai import OpenAI
# Works with Crazyrouter, OpenRouter, AIMLAPI, Portkey, LiteLLM, etc.
client = OpenAI(
base_url="https://<aggregator-endpoint>/v1",
api_key="your-aggregator-key"
)
response = client.chat.completions.create(
model="gpt-5", # or claude-sonnet-4.6, gemini-2.5-pro, etc.
messages=[{"role": "user", "content": "Hello!"}]
)
print(response.choices[0].message.content)
The migration from direct provider APIs typically takes under 5 minutes.
Last updated: April 2026. Pricing and model counts change frequently — check each platform's website for current details.
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