OpenRouter vs. AssemblyAI

Learn why developers choose AssemblyAI’s LLM Gateway to build Voice AI on one OpenAI-compatible API:

0% markup—pay provider rates, with no ~5.5% credit-purchase fee
Native speech-to-text in the same pipeline—transcribe and reason over audio without a second vendor
Automatic per-model fallbacks, EU data residency, and opt-in zero data retention

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At a glance: OpenRouter vs. AssemblyAI

Model

AssemblyAI LLM Gateway

OpenRouter

Pricing

0% markup, no credit fee

Provider rates + ~5.5% credit fee

Models

25+ curated production models

400+ models, 70+ providers

Speech-to-text

First-party models—no extra hop

Routes to third-party ASR

Automatic fallbacks

Configurable per-model

EU data residency

Default-on for EU traffic

Enterprise-only

Zero data retention

Opt-in, per request

Via ZDR-provider routing

BAA available

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OpenAI SDK compatible

Everything you get with the AssemblyAI LLM Gateway

0% markup

Pay provider token rates with no gateway markup, no credit-purchase fee, and no minimum commitment. The price you see is the price you pay.

Automatic fallbacks

Configure a primary model and any number of backups per request. If a provider errors or rate-limits, the Gateway retries the next model—no code changes.

Native speech-to-text

Transcribe with AssemblyAI’s own speech models and apply any LLM to the result in one pipeline—no second vendor and no extra network hop.

25+ frontier models

GPT, Claude, Gemini, Qwen, Mistral, and more behind one OpenAI-compatible API. New models are added the day they launch.

OpenAI-compatible

Drop into any OpenAI SDK or HTTP client. Change a base URL and a model string, and the rest of your code keeps working.

EU data residency

Route requests through EU-resident infrastructure, on by default for traffic originating in the EU, for GDPR-sensitive workloads.

Zero data retention

Opt into zero data retention per request or project-wide, so prompts and responses are never stored.

BAA available

Sign a Business Associate Addendum for applications that process PHI, backed by SOC 2 Type 2, ISO 27001, PCI DSS, and GDPR.

Start building

Get your free API key and make your first Gateway call in minutes—no commitments or minimums.

Live demo

Pick a model. Take action on your audio.

The same transcript, four different jobs, four different models — all routed through one endpoint.

Prompt

What is runner's knee?

claude-opus-4-7 412 ms · 47 tokens

Based on the transcript, runner's knee is a condition characterized by pain behind or around the kneecap. It is caused by overuse, muscle imbalance and inadequate stretching. Symptoms include pain under or around the kneecap and pain when walking.

Ready to move off OpenRouter?

Switch to one OpenAI-compatible API with 0% markup, automatic fallbacks, and native speech-to-text—no credit fees or minimums.

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Playground

We’re not playing around—but you can

Put our Voice AI models and the LLM Gateway to the test in our no-code playground.

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Frequently asked questions

: AssemblyAI’s LLM Gateway is a single OpenAI-compatible API to 25+ curated frontier models with automatic fallbacks, 0% markup, and native speech-to-text in the same pipeline. OpenRouter is a larger marketplace that routes to 400+ models across 70+ providers and charges roughly 5.5% on credit purchases. Choose AssemblyAI when you’re building on audio and want speech and LLM calls in one platform; choose OpenRouter when maximum model breadth is the priority.
: No. AssemblyAI passes through provider token rates with 0% markup and no credit-purchase fee. OpenRouter also passes through token prices, but it charges about 5.5% on card credit top-ups (5% on crypto, with a minimum per transaction), which adds up at volume.
: AssemblyAI, because it runs its own speech-to-text models and lets you apply any LLM to the transcript in one pipeline—no second vendor and no extra network hop. OpenRouter can route to third-party ASR such as Whisper, but it has no first-party speech model or audio intelligence.
: Yes. Configure a primary model and any number of fallbacks per request, and the Gateway retries the next model automatically if the primary errors or rate-limits. OpenRouter offers comparable provider and model fallbacks across its catalog.
: Yes. Point any OpenAI SDK at the Gateway, change the base URL and model string, and your existing code works unchanged—the same drop-in experience OpenRouter offers.
: Yes. EU data residency is on by default for EU traffic, zero data retention is available per request, and AssemblyAI can sign a Business Associate Addendum (BAA) for workloads that process PHI. OpenRouter’s EU in-region routing is an enterprise-only feature, and it does not publish a BAA.