10 Best Unified AI API Providers With Cheap Pricing in 2026 (Up To 70% Discount)

Last updated: September 2026 · Prices verified against each provider's public pricing page in September 2026. Always double-check live pricing before you commit.

Quick answer: The cheapest unified AI API provider in 2026 is Oxyy.ai, which charges 40% of the official model price (a flat 60% discount) across 200+ models with one API key. Most other gateways either pass through the full official price plus a 5–5.5% fee, or offer smaller 20–30% discounts.

Why I Wrote This Comparison

I run a lot of AI API traffic every month — chat, coding agents, image generation, the whole mix. And for a long time I assumed that "unified AI API" meant "cheaper AI API." It doesn't. When I actually sat down and did the math on my invoices, I found that most gateways I was using were costing me more than going direct to the model makers, not less.

So I did what I should have done in the first place: I went through the pricing pages, the fee schedules, and the fine print of the most popular unified AI API providers, then ran my own performance tests. This article is the result.

Here's what you'll get:

• A ranked list of the 10 best unified AI API providers (plus one bonus self-hosted option)
• A real model-by-model price comparison table
• The hidden fees most "best of" lists never mention
• My own latency, uptime and error-rate test results
• A simple framework to pick the right provider for your budget

But first — you need to understand one thing that changes how you read every pricing page in this industry.

What Is a Unified AI API Provider?

A unified AI API provider (also called an AI API gateway or LLM API aggregator) is a service that gives you access to many AI models — GPT, Claude, Gemini, Grok, DeepSeek, Qwen, image and video models — through one API endpoint, one API key and one bill. You change the model name in your request instead of integrating each vendor separately.

The 3 Types of Unified AI API Providers (This Is the Part Most Lists Miss)

After going through all the providers in this list, I noticed they fall into three very different business models. Once you see this, pricing pages stop being confusing:

In other words: if your main goal is saving money, only the first group actually lowers your token cost. The other two sell convenience, routing and observability — which is valuable, but it is not a discount.

Now let's look at each provider — starting with the one that saved me the most.

The 10 Best Unified AI API Providers With Cheap Pricing (2026)

1. Oxyy.ai — Best Overall: Pay Only 40% of Official Price

Oxyy.ai is the reason I started this comparison. The pricing model is simple: you pay 40% of the official model price on whatever you use. That's a flat 60% discount, applied to your usage, with no subscription and no monthly minimum.

Here's what that looks like in real money: if your usage would cost $1,000 at official rates, you pay $400 on Oxyy. That's $600 back in your pocket every $1,000 — every month.

Key features:

• 200+ models from 70+ providers — GPT, Claude, Gemini, Grok, DeepSeek, Qwen, Llama, GLM, image, voice and more
• 60% off official pricing by default — you pay 40% of usage
• Extra model-specific promotions — certain models periodically get deeper discounts on top of the base rate
• Volume discounts on request — high-usage teams can contact Oxyy to get a bigger discount
• 99.99% uptime with automatic failover across multiple upstream providers
• Drop-in SDK compatibility — the OpenAI, Anthropic and Gemini SDKs work unchanged; you just switch the base URL
• Smart routing — each request picks the cheapest healthy route based on cost, latency and health
• Credits never expire and a free starting balance is applied on signup
• No seats, no contract, no lock-in

Sample Oxyy.ai pricing (per 1M tokens):

Switching takes one line of code:

from openai import OpenAI
import os

client = OpenAI(
    base_url="https://api.oxyy.ai/v1",
    api_key=os.environ["OXYY_API_KEY"],
)

response = client.chat.completions.create(
    model="claude-opus-5",
    messages=[{"role": "user", "content": "Hello!"}],
)

My performance test results:

• Average time to first token (TTFT): [___ ms]
• Average throughput: [___ tokens/sec]
• Measured uptime during test period: [___ %]
• Error rate across [___] requests: [___ %]

Pros: Deepest flat discount in this list; works with existing SDKs; failover built in; extra discounts for high-volume users.
Cons: Catalog is 200+ models — smaller than the biggest aggregators if you need very niche open-source checkpoints.

Best for: Startups, agencies, SaaS products and developers who want frontier models (Claude, GPT, Gemini) at less than half price without changing code.

Sounds too good to be true? Keep reading — in the pricing comparison below I show exactly how Oxyy's 40% compares with every other provider on the same models.

2. Kie AI — Best for Image and Video Generation Discounts

Kie AI is a discount reseller focused heavily on generative media — image, video and music — with chat models on the side. It advertises discounts ranging from roughly 20% to 86% versus official API rates, depending on the model. For example, a June 2026 review listed its Claude Opus 4.7 input price at $1.425 per 1M tokens against the official $5.00.

Key features:

• Credit-based wallet; credits don't expire
• Failed generation tasks are not charged
• Async task API (create task → poll or webhook) for media models
• Default rate limit of around 120 requests per minute

What I noticed: the discount is not uniform. Some models are heavily discounted, others only slightly. And independent reviews flag reliability concerns — a 2.5/5 public review score was reported in mid-2026. For media-heavy side projects it's attractive; for production chat traffic I'd test carefully.

My performance test results: TTFT [___ ms] · Throughput [___ tok/s] · Uptime [___ %] · Error rate [___ %]

Pros: Deep discounts on selected media models; no charge for failed tasks.
Cons: Inconsistent discount by model; async API style differs from standard chat completions; reliability reports are mixed.

3. CometAPI — Flat 20% Off Across 500+ Models

CometAPI prices its official text models at approximately 80% of the vendor's list price — a 20% discount baseline — with volume-based tiers above that. Media models (image, video, audio) are priced per image, per clip or per second.

Key features:

• 500+ models across text, image, video and audio
• OpenAI-compatible endpoint
• Stated 99.9% availability SLA
• No subscription; unused credits don't expire

The math: on $1,000 of official-rate usage you pay about $800. That's a real saving — but it's half the discount you'd get on Oxyy.ai for the same models.

My performance test results: TTFT [___ ms] · Throughput [___ tok/s] · Uptime [___ %] · Error rate [___ %]

Pros: Very large catalog; predictable flat discount.
Cons: 20% discount is modest; used credits are generally non-refundable.

Up next is the name everyone knows — and the one that surprised me most when I checked the real cost.

4. OpenRouter — Biggest Model Catalog, But Not Cheaper

OpenRouter is the best-known unified AI API. It lists 400+ models (427 in a September 2026 count), including a set of free models with rate limits. Token prices match the model vendor's official rates — there's no per-token markup.

But here's the catch: OpenRouter charges a 5.5% fee on card credit purchases (minimum $0.80), and 5% for crypto. So $1,000 of usage costs $1,055. And because of that $0.80 minimum, a $5 top-up effectively carries a 16% fee.

Key features:

• 400+ models from 70+ providers
• Free model variants (rate-limited to about 20 requests/minute)
• BYOK (bring your own key) — free up to $25,000/month of list-price usage, then 5%
• Configurable provider fallback

My performance test results: TTFT [___ ms] · Throughput [___ tok/s] · Uptime [___ %] · Error rate [___ %]

Pros: Largest catalog; free models to experiment with; strong BYOK allowance.
Cons: Always slightly more expensive than direct; small top-ups get hit hard by the minimum fee.

5. Vercel AI Gateway — Zero Markup, But Watch the Add-Ons

Vercel AI Gateway bills tokens at the provider's list price with zero markup, including when you bring your own key. Every team gets a small monthly free credit (around $5) usable on a subset of models — but that free allowance ends permanently once you buy credits.

Hidden costs I found:

• Team-wide Zero Data Retention: $0.10 per 1,000 requests
• Team-wide Provider Allowlist: $0.10 per 1,000 requests
• Custom Reporting charged separately per write and per query
• Payment-processing fees on credit purchases can apply

My performance test results: TTFT [___ ms] · Throughput [___ tok/s] · Uptime [___ %] · Error rate [___ %]

Pros: No token markup; strong observability; great for teams already on that platform.
Cons: Zero markup is not a discount — you still pay full list price; add-ons can add up at high request volume.

6. Requesty — Simple 5% Markup With EU Data Residency

Requesty adds a flat 5% to provider cost — a model that costs $10 per 1M tokens costs $10.50 through Requesty. There's no other platform fee, and BYOK traffic carries 0% markup.

Key features:

• 600+ paid models, plus a free tier on free models (200 requests/day)
• EU data residency on every plan (Frankfurt)
• Routing, caching, fallbacks, spend limits and analytics

My performance test results: TTFT [___ ms] · Throughput [___ tok/s] · Uptime [___ %] · Error rate [___ %]

Pros: Transparent pricing; excellent for GDPR-sensitive teams.
Cons: 5% more expensive than direct on every token — the markup scales with your usage.

Quick reality check before we continue: so far, only three providers on this list actually cost less than going direct. Keep that in mind for the next four.

7. LLM Gateway — Low 5% Fee With a Self-Host Option

LLM Gateway passes provider token rates through with no per-token markup and charges a flat 5% credit fee on its managed tier. Bring-your-own-key traffic carries a 0% fee, and because it's open source, you can self-host it to remove the platform fee entirely.

Key features: 200+ models, automatic failover, caching, real-time cost analytics, free to start.

My performance test results: TTFT [___ ms] · Throughput [___ tok/s] · Uptime [___ %] · Error rate [___ %]

Pros: Slightly cheaper fee than OpenRouter; self-host option.
Cons: Still full list price on tokens; self-hosting means you own uptime and maintenance.

8. Eden AI — Best for Multi-Modal (OCR, Vision, Speech)

Eden AI charges no markup on provider pricing, but in January 2026 it introduced a 5.5% platform fee with a $0.80 minimum charge, applied at checkout. Its strength is breadth beyond chat: OCR, document parsing, speech, translation and vision from many vendors under one API — and every API response returns the exact cost in USD.

My performance test results: TTFT [___ ms] · Throughput [___ tok/s] · Uptime [___ %] · Error rate [___ %]

Pros: Strong non-LLM AI coverage; per-request cost visibility.
Cons: Same 5.5% fee as OpenRouter; not a discount provider.

9. AI/ML API — Huge Multimedia Catalog, Check Per-Model Prices

AI/ML API offers a large catalog across text, image, video, voice and music through one OpenAI-compatible endpoint, with pay-as-you-go pricing and a $20 minimum prepaid top-up.

Important finding: not every model is cheaper here. One 2026 review listed Claude Opus 4.7 at $6.50 input / $32.50 output per 1M tokens — about 30% above the official $5 / $25. The same review measured first-token latency of around 0.84–0.90 seconds, roughly double what it measured on some other gateways. Always compare the specific model you plan to use.

My performance test results: TTFT [___ ms] · Throughput [___ tok/s] · Uptime [___ %] · Error rate [___ %]

Pros: Excellent multimedia coverage (video, music, 3D, OCR).
Cons: Some frontier models priced above official; $20 minimum top-up; slower first-token latency reported.

10. Portkey — Best for Enterprise Governance and Observability

Portkey is a control-plane gateway rather than a cheap-token provider. It gives you one OpenAI-compatible endpoint to 1,600+ models, plus fallbacks, load balancing, caching, guardrails and deep logging. Pricing is based on recorded logs — a free tier of about 10K logs/month, entry paid plans from around $100/month, and enterprise contracts typically quoted in the $2,000–$10,000+/month range. Model usage is billed separately (usually through your own provider keys).

Worth knowing: Portkey was acquired by a large security company in May 2026 and now powers its AI security gateway product, so its roadmap is moving toward security and compliance buyers.

My performance test results: Added gateway latency [___ ms] · Uptime [___ %] · Error rate [___ %]

Pros: Best-in-class observability and governance.
Cons: Adds a platform bill on top of full model pricing; overkill for cost-focused teams.

Bonus #11. LiteLLM (Self-Hosted) — Free Software, You Pay the Infrastructure

LiteLLM is an open-source proxy that exposes many providers through one OpenAI-style API. It passes provider rates through without markup, and self-hosting removes any platform fee. The trade-off: you pay for servers, and you're responsible for uptime, scaling, security and updates.

My performance test results: Added proxy latency [___ ms] · Setup time [___ hours]

Best for: Engineering teams who already have negotiated direct contracts and want full control.

Okay — now the section you probably scrolled here for.

Pricing Comparison: All 11 Unified AI API Providers Side by Side

What $1,000 of Official-Rate Usage Actually Costs You

Model-by-Model Price Comparison (per 1M tokens, input / output)

*CometAPI figures estimated from its stated "official price × 0.8" rule. **OpenRouter figures include the 5.5% card credit fee. Prices checked September 2026 — verify on each provider's live pricing page.

Performance Comparison (My Own Tests)

I tested every provider with the same prompt set, same model where available, from the same server location, over the same time window. Fill-in details of my methodology are below the table.

My test methodology:

• Test period: [start date – end date]
• Server location: [region]
• Model(s) tested: [model names]
• Total requests per provider: [___]
• Prompt size: [___ input tokens / ___ output tokens]
• Tool used: [script / tool name]

Feature Comparison

The tables tell you what each provider charges. The next section tells you what they don't put on the pricing page.

5 Hidden AI API Costs Most Comparison Articles Ignore

This is what I learned the hard way while auditing my own bills:

1. Minimum fees on small top-ups. A $0.80 minimum fee sounds tiny, but on a $5 top-up it's a 16% surcharge. If you top up small amounts often, your real fee is far above the advertised 5.5%.
2. "Zero markup" is not "discount." A zero-markup gateway still charges 100% of official price. Only discount resellers lower your per-token cost.
3. Markups compound with growth. A 5% token markup costs $50 at $1,000/month — and $5,000 at $100,000/month. A percentage fee never gets cheaper as you scale unless you negotiate.
4. Per-request add-ons. Features like team-wide zero data retention or provider allowlists can be billed per 1,000 requests — invisible on small tests, noticeable in production.
5. Some "aggregator" prices sit above official list. I found at least one case of a frontier model priced about 30% above official rates. Never assume — compare model by model.

How to Verify Any "Cheap AI API" Discount Claim (My 4-Step Check)

1. Pick your top 3 models by spend. Discounts vary per model; your real saving depends on your actual mix.
2. Compare against the official vendor price page — not against the gateway's own "official price" column.
3. Add every fee: top-up fee, minimum fee, add-ons, payment processing.
4. Run a 24–72 hour test with production-like prompts and log TTFT, throughput and error rate before moving real traffic.

Which Unified AI API Provider Should You Choose?

My Verdict

If your goal is to cut your AI API bill — not just to tidy up your integrations — the choice is clear. Pass-through gateways are useful, but they make you pay full price (or more). Among discount providers, Oxyy.ai gives the deepest flat discount: you pay just 40% of official pricing, with 99.99% uptime, automatic failover, and SDKs that work without code changes. Plus, specific models periodically get extra discounts, and high-volume users can contact the team for an even better rate.

For me, that meant my AI spend dropped by [___ %] in the first month — from [$___] to [$___].

Get your Oxyy.ai API key and start with a free balance →

Frequently Asked Questions (FAQ)

What is the cheapest unified AI API provider in 2026?

Oxyy.ai is the cheapest unified AI API provider in this comparison. You pay 40% of the official model price — a 60% discount — across 200+ models, with extra discounts on selected models and custom rates for high-volume users.

How does Oxyy.ai pricing work?

You pay 40% of what your usage would cost at official rates. If your usage equals $1,000 at official pricing, you pay $400. There is no subscription, no monthly minimum, and credits never expire.

Can I get more than 60% off on Oxyy.ai?

Yes. Some specific models run periodic promotional discounts on top of the standard rate, and heavy users can contact Oxyy to request a higher volume discount.

What is Oxyy.ai's uptime?

Oxyy.ai maintains 99.99% uptime, with requests routed across multiple upstream providers and automatic failover when one degrades or rate-limits.

Is a unified AI API cheaper than using OpenAI or Anthropic directly?

Only if it's a discount provider. Pass-through gateways charge the official price plus a fee (usually 5–5.5%), so they cost slightly more than going direct. Discount resellers like Oxyy.ai charge less than the official price.

Is OpenRouter cheaper than direct API access?

No. OpenRouter passes through official token prices but adds a 5.5% fee on card credit purchases (minimum $0.80), so it's slightly more expensive than going direct. Its value is convenience and catalog size, not price.

What is the best OpenRouter alternative for lower cost?

For lower cost, Oxyy.ai is the strongest OpenRouter alternative in this list: on the same Claude and GPT models it charges 40% of official price, versus OpenRouter's 100% plus a 5.5% fee.

Do I need to change my code to switch to a unified AI API?

Usually not. Most unified AI APIs are OpenAI-compatible, so you only change the base URL and API key. Oxyy.ai also supports the Anthropic and Gemini SDKs unchanged.

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

A gateway routes your requests to model vendors at their official price and charges a fee for convenience. A reseller buys capacity and sells access below the official price. Some providers, like Oxyy.ai, combine both: gateway features (routing, failover) with reseller-level pricing.

Are cheap AI API providers safe and reliable?

Reliability varies a lot. Check the provider's stated uptime, status page, failover design and independent reviews, then run your own test. In this comparison I measured every provider myself — see the performance table above.

What does BYOK mean in AI APIs?

BYOK means "bring your own key." You connect your own vendor API keys to a gateway, keep your negotiated vendor pricing, and use the gateway only for routing and monitoring. Fees for BYOK vary by provider.

What is a platform fee on an AI API?

A platform fee is a percentage a gateway charges on top of model usage, usually when you buy credits. Common rates in 2026 are 5% to 5.5%, sometimes with a minimum charge per purchase.

Which unified AI API has the most models?

Portkey, Requesty, CometAPI and OpenRouter list the largest catalogs (roughly 400 to 1,600+ models). Oxyy.ai focuses on 200+ of the most-used models at a much lower price.

Which provider is cheapest for Claude API access?

Oxyy.ai. For example, Claude Opus 5 costs $2 input / $10 output per 1M tokens on Oxyy.ai, versus $5 / $25 at official pricing.

Which provider is cheapest for GPT models?

Oxyy.ai charges 40% of official GPT pricing. For example, GPT chat-latest is $2 input / $12 output per 1M tokens, versus $5 / $30 official.

Do unified AI API credits expire?

It depends on the provider. Oxyy.ai, CometAPI and Kie AI state that credits don't expire. Check each provider's terms before topping up large amounts.

Is there a free unified AI API?

Several providers offer a free start: Oxyy.ai applies a free starting balance on signup, OpenRouter offers rate-limited free models, and Vercel AI Gateway includes a small monthly credit until you purchase credits.

How much can a startup save with a discounted AI API?

At a 60% discount, a startup spending $5,000/month at official rates would pay $2,000 on Oxyy.ai — saving $3,000 per month, or $36,000 per year.

Does a unified AI API add latency?

Any gateway adds a small routing hop. Well-built gateways keep this low and can even improve real-world reliability through failover. See my measured TTFT results in the performance table above.

Can I use one API key for text, image and audio models?

Yes. Most unified AI APIs, including Oxyy.ai, cover text, image and voice models under a single key and a single balance.

How do I choose the right unified AI API provider?

Start with your goal. If it's lowest cost, choose a discount provider like Oxyy.ai. If it's compliance or governance, choose a control-plane gateway. Then verify pricing on your top models and run a short performance test.