Top 10 AI API Proxies & Reverse Proxies for Developers in 2026

A hands-on comparison of 10 AI API proxies — commercial gateways, open-source solutions, and self-hosted options — with real pricing data, working code examples, and a feature matrix.

What Is an AI API Proxy?

An AI API proxy sits between your application and AI providers (OpenAI, Anthropic, Google, etc.), handling authentication, routing, rate limiting, caching, and failover. Instead of managing separate API keys and SDKs for each provider, you hit one endpoint.

Think of it as NGINX for AI models — but purpose-built for the unique challenges of LLM traffic: streaming responses, token-based billing, model-specific quirks, and multi-provider failover.

Why you need one:

• One API key, many models — Stop juggling 5 different provider accounts
• Cost optimization — Route to cheaper models for simple tasks, cache repeated queries
• Reliability — Automatic failover when a provider goes down (it happens more than you think)
• Observability — Track costs, latency, and token usage across all providers
• Security — Centralize API key management instead of scattering keys across services

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Quick Comparison

Proxy	Type	Models	Pricing	Self-Host	Best For
Crazyrouter	Commercial	627+	~55% of official	❌	Cheapest multi-modal access
LiteLLM	Open Source	100+ providers	Free	✅	Self-hosted LLM proxy
OpenRouter	Commercial	300+	Official + 10-30%	❌	Quick prototyping
Portkey	Commercial	1,600+ (BYOK)	Free–$49/mo	✅	Enterprise governance
One API	Open Source	40+ providers	Free	✅	Chinese dev community
Helicone	Commercial	BYOK	Free–$20/mo	✅	Observability layer
NGINX AI Proxy	Open Source	Config-based	Free	✅	Existing NGINX users
Cloudflare AI GW	Commercial	BYOK	Free	❌	Edge caching
Kong AI Gateway	Commercial	Plugin-based	Enterprise	✅	Existing Kong users
Unify AI	Commercial	80+	Pay-per-token	❌	Benchmark-driven routing

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Commercial Proxies

1. Crazyrouter — Cheapest Multi-Modal API Proxy

Website: crazyrouter.com

Crazyrouter is the most aggressive on pricing: roughly 55% of official API prices across 627+ models. But what makes it unique among proxies is multi-modal coverage — it's the only gateway that handles LLM, image generation, video generation, and music generation through a single endpoint.

Models covered:

• LLMs: GPT-5/5.2, Claude Opus 4.6/Sonnet 4.6, Gemini 3 Pro, DeepSeek V3.2/R1, Grok 4, Qwen 3
• Image: DALL-E 3, Midjourney, Flux Pro, Stable Diffusion 3.5
• Video: Sora 2, Kling V2.6, Veo 3, Runway Gen4
• Music: Suno V4

Pricing comparison:

Model	Official	Crazyrouter	Savings
GPT-5.2	$3.00 / $12.00 per 1M tokens	~$1.65 / $6.60	45%
Claude Opus 4.6	$15.00 / $75.00	~$8.25 / $41.25	45%
Claude Sonnet 4.6	$3.00 / $15.00	~$1.65 / $8.25	45%
Gemini 3 Pro	$1.25 / $10.00	~$0.69 / $5.50	45%

Drop-in replacement — change two lines:

from openai import OpenAI

client = OpenAI(
    base_url="https://crazyrouter.com/v1",
    api_key="your-crazyrouter-key"
)

response = client.chat.completions.create(
    model="gpt-5-mini",
    messages=[{"role": "user", "content": "What is an AI API proxy? One sentence."}]
)
print(response.choices[0].message.content)

Tested response (March 2026):

{
  "model": "gpt-5-mini",
  "choices": [{
    "message": {
      "content": "An AI API proxy is an intermediary service that routes and transforms requests and responses between applications and AI providers while handling authentication, security, rate limiting, caching, logging, and policy enforcement."
    },
    "finish_reason": "stop"
  }],
  "usage": {"prompt_tokens": 17, "completion_tokens": 37, "total_tokens": 54}
}

Also natively supports Anthropic SDK format and Google Gemini format — no forced conversion to OpenAI format.

✅ Cheapest pricing (~55% of official), 627+ models including image/video/music, OpenAI + Anthropic + Gemini compatible, 7 global regions
❌ No self-hosting, smaller community than OpenRouter

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2. OpenRouter — The Popular Default

Website: openrouter.ai

OpenRouter is the most widely known AI API proxy. 300+ models, a free tier for some models, and a large community. It's the "safe default" choice.

The catch: 10-30% markup on top of official prices. For prototyping this doesn't matter. At scale, it adds up fast — a $10,000/month API bill becomes $11,000-$13,000.

✅ Largest community, free tier for some models, easy to start
❌ 10-30% markup, LLM only (no image/video), no self-hosting

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3. Portkey — Enterprise Control Plane

Website: portkey.ai

Portkey positions itself as the "control plane for AI apps." If your team needs SOC 2 compliance, RBAC, audit logs, and guardrails (PII detection, content filtering), Portkey is the enterprise answer.

Key features:

• 1,600+ LLMs (BYOK — Bring Your Own Key)
• Guardrails: PII detection, input/output validation
• Distributed tracing, cost dashboards, latency monitoring
• Prompt management with A/B testing
• Automatic failover between providers

Pricing: Free (10K requests/month) → Pro $49/month → Enterprise custom

✅ Most comprehensive governance, SOC 2, open-source core
❌ BYOK (no token cost savings), complex setup, overkill for simple projects

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4. Helicone — Observability-First Proxy

Website: helicone.ai

Helicone isn't a model aggregator — it's Datadog for AI API calls. One-line integration (change your base URL), and you get full request/response logging, cost tracking, semantic caching, and latency monitoring.

Pricing: Free (100K requests/month) → Pro $20/month

✅ Best AI observability, 100K free requests/month, one-line setup
❌ Not a model aggregator (BYOK), adds a proxy hop

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5. Cloudflare AI Gateway — Edge Caching

Website: developers.cloudflare.com/ai-gateway

Free proxy layer running on Cloudflare's edge network. Provides caching, rate limiting, and basic analytics. If you're already using Cloudflare, this is a no-brainer addition.

✅ Free, global edge network, edge caching reduces repeated query costs
❌ BYOK (no cost savings), basic analytics, no smart routing

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6. Unify AI — Benchmark-Driven Routing

Website: unify.ai

Unify's unique angle: instead of you picking the model, it automatically routes to the optimal model based on benchmarks, cost, and latency.

✅ Intelligent routing, data-driven decisions
❌ Only 80+ models, benchmark scores may not match your use case

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7. Kong AI Gateway — For Kong Shops

Website: konghq.com

AI plugins for the popular Kong API Gateway. Natural extension if your org already uses Kong for API management.

✅ Reuses existing Kong infrastructure, enterprise-grade
❌ Pointless without Kong, complex AI-specific configuration

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Open-Source / Self-Hosted Proxies

8. LiteLLM — The Go-To Open Source Proxy

GitHub: github.com/BerriAI/litellm (18K+ stars)

LiteLLM is the most popular open-source AI API proxy. Python-based, supports 100+ providers, OpenAI-compatible endpoint. If you want full control over your AI infrastructure with data staying on your servers, LiteLLM is the standard choice.

pip install litellm
litellm --config config.yaml

model_list:
  - model_name: gpt-5
    litellm_params:
      model: openai/gpt-5
      api_key: sk-xxx
  - model_name: claude-opus
    litellm_params:
      model: anthropic/claude-opus-4-6
      api_key: sk-ant-xxx

Features: virtual keys, budget management, rate limiting, load balancing, spend tracking.

✅ MIT license, data never leaves your infra, active community, cost tracking
❌ You manage the infrastructure, BYOK (no token discounts), LLM only

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9. One API — Popular in Chinese Dev Community

GitHub: github.com/songquanpeng/one-api (20K+ stars)

One API is the most widely used open-source AI proxy in Chinese-speaking developer communities. It provides a web-based admin panel for managing multiple API keys, channels, and token quotas. Think of it as LiteLLM + admin dashboard, with a focus on key management and reselling scenarios.

Key features:

• Web admin panel (manage keys, channels, quotas)
• Multi-tenant support (create sub-accounts with token limits)
• Channel balancing (distribute requests across multiple keys)
• 40+ providers supported
• Docker one-click deployment

✅ Best admin UI among open-source options, multi-tenant, 20K+ GitHub stars
❌ Less active English community, some providers lag behind LiteLLM

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10. NGINX AI Proxy — For NGINX Veterans

Blog: blog.nginx.org/blog/using-nginx-as-an-ai-proxy

NGINX now supports AI-specific proxy configurations — streaming SSE responses, request/response transformation for different providers, and load balancing across AI backends. If your team already runs NGINX, adding AI proxy capabilities is a natural extension.

✅ Leverages existing NGINX expertise, no new dependencies, battle-tested infrastructure
❌ Manual configuration, no built-in model routing or cost tracking, steep learning curve for AI-specific features

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Feature Matrix

Feature	Crazyrouter	LiteLLM	OpenRouter	Portkey	One API	Helicone	CF GW
Models	627+	100+	300+	1,600+(BYOK)	40+	BYOK	BYOK
Price discount	~45%	None	-10-30%	None	None	None	None
Image/Video/Music	✅	❌	❌	❌	❌	❌	❌
Self-host	❌	✅	❌	✅	✅	✅	❌
Admin UI	Dashboard	✅	❌	✅	✅	✅	✅
Guardrails	❌	❌	❌	✅	❌	❌	❌
Smart routing	❌	Basic	❌	✅	❌	❌	❌
Caching	❌	✅	❌	✅	❌	✅	✅
OpenAI compatible	✅	✅	✅	✅	✅	✅	✅

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How to Choose

Decision tree:

1. "I need the cheapest token prices" → Crazyrouter (~45% off official prices, widest model coverage)

2. "I need data to stay on my servers" → LiteLLM (open source, MIT, most providers) or One API (if you want an admin panel)

3. "I need enterprise governance" → Portkey (SOC 2, guardrails, RBAC, audit logs)

4. "I need to understand my AI spending" → Helicone (best observability, 100K free requests)

5. "I also need image/video/music generation" → Crazyrouter (only gateway covering full multi-modal spectrum)

6. "I'm already using Cloudflare/Kong/NGINX" → Add their AI gateway plugins to your existing stack

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FAQ

What's the difference between an AI API proxy and an AI API gateway?

In practice, they're used interchangeably. Technically, a "proxy" forwards requests to AI providers, while a "gateway" adds management features (auth, rate limiting, analytics, routing). Every tool in this list does both — the distinction is marketing, not technical.

Can I use multiple AI proxies together?

Yes. A common pattern: use Crazyrouter for model access (cheapest tokens) + Helicone for observability (track what's happening). Or self-host LiteLLM as your proxy layer, routing to Crazyrouter for cost savings. See our cost optimization guide for architecture patterns.

Do AI proxies add latency?

Minimal — typically 5-20ms for commercial proxies (Crazyrouter, OpenRouter). Self-hosted proxies (LiteLLM, One API) add almost no latency if deployed in the same region as your app. Cloudflare AI Gateway can actually reduce latency through edge caching. For a deep dive, see our latency optimization guide.

Which proxy is best for production use?

Depends on your constraints. For cost: Crazyrouter. For control: LiteLLM. For enterprise: Portkey. For observability: Helicone. Many production systems use 2-3 of these together. Check our load balancing guide for production architecture patterns.

Is it safe to route API keys through a third-party proxy?

Commercial proxies (Crazyrouter, OpenRouter, Portkey) manage keys on your behalf — you don't send your provider keys through them. For BYOK proxies (Helicone, Cloudflare), your keys pass through their infrastructure — check their security practices. For maximum security, self-host with LiteLLM or One API.

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Last updated: March 2026. Prices and model counts change frequently — check each platform's website for the latest.