I am speedFast.com-style speed test for LLM APIs

A fast.com-style speed test for LLM APIs that measures how fast models respond in tokens per second and compares throughput across many providers.

free

LLM benchmarktokens per secondAPI speed testmodel comparisonthroughputOpenAIAnthropicdeveloper tool

IndexedAugust 3, 2026

UpdatedAugust 5, 2026

3.2 (0 Number of reviews)

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I am speed (the site brands itself as LLMark) is a benchmarking tool for large language model APIs. Its stated goal is to be a fast.com-style speed test for LLMs: instead of measuring internet bandwidth, it measures how quickly different model endpoints generate output.

What it measures

The main metric is throughput in tokens per second (tok/s). The interface shows live throughput timing while a test runs and reports the fastest tok/s result, along with an engine status readout indicating whether the service is active. This makes it useful for comparing the raw response speed of one model or provider against another.

Providers covered

The tool lists support for a broad set of endpoints so speeds can be compared side by side.

Hosted providers: OpenAI, Anthropic, Groq, Cerebras, Fireworks AI, Mistral, OpenRouter, Google Gemini, x.ai, z.ai and Kimi.
Local models: self-hosted models can also be benchmarked.

Good to know

The public page focuses on the live speed display and provider list. It does not clearly state pricing, account requirements or whether the project is open source, so those details should be confirmed on the site itself. Because it measures speed rather than answer quality, it is best treated as one signal among several when choosing a model.

Pros & Cons

Pros

Simple fast.com-style way to compare LLM response speed
Covers many major providers plus local models
Reports throughput in tokens per second with a live readout
Handy for picking the fastest endpoint for a task

Cons

Measures speed only, not answer quality or cost
Pricing and open-source status are not clearly stated on the page

Frequently Asked Questions

What does I am speed measure?

It measures how fast an LLM endpoint generates output, reported as tokens per second.

Which providers are supported?

It lists OpenAI, Anthropic, Groq, Cerebras, Fireworks AI, Mistral, OpenRouter, Google Gemini, x.ai, z.ai, Kimi and local models.

Does it test answer quality?

No. It focuses on speed, so it is best used alongside other checks for quality and cost.

Is it free?

The page does not clearly state pricing, so this should be confirmed on the official site.

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