LLM Latency Tracker

Independent, provider-neutral latency & uptime for AI inference APIs — measured, not scraped.

🌐 Live: llmlatency.dev · 📊 JSON API · 🤖 MCP server · 🗓️ Deprecation calendar

Most "AI API latency" numbers come from the providers themselves, or from a benchmark run once and never updated. This project measures it continuously, from multiple regions, and publishes the result as an open dataset.

• Edge latency — full DNS → TCP → TLS → time-to-first-byte, measured with the Python standard library (no API key required).
• Inference latency — real time-to-first-token via a streaming request (optional, needs a provider key).
• Uptime — success rate per provider, per region.
• Regions — Europe (Germany), US (Central), Asia (Tokyo), South America (São Paulo). More welcome.
• ~45 providers — OpenAI, Anthropic, Google, Mistral, DeepSeek, xAI, Groq, Together, Fireworks, Cerebras, OpenRouter, Perplexity, plus Chinese models (GLM/Zhipu, Kimi/Moonshot, Qwen, MiniMax) and many more.
• Deprecation calendar — upcoming model retirements + migration targets, verified from official provider docs.

The site is a self-updating static site (Cloudflare Pages). The value isn't the code — it's the continuously-accumulated, distributed measurement archive. The code is open so the methodology is transparent.

For developers

# All regions, provider rankings for the last 24h — measured latency + uptime:
curl https://llmlatency.dev/api/rankings.json

• JSON API: /api/rankings.json · OpenAPI: /openapi.json
• Any page as Markdown: send Accept: text/markdown to any page URL, or append .md.
• For LLM ingestion: /llms.txt (index) and /llms-full.txt (full corpus).
• License: data is CC-BY-4.0 — free to use with attribution.

For AI agents

There's a real MCP server (Streamable HTTP) exposing a get_ai_api_latency tool backed by the live data:

curl -X POST https://llmlatency.dev/mcp \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call",
       "params":{"name":"get_ai_api_latency","arguments":{"region":"eu-hetzner"}}}'

Also available: an MCP Server Card (/.well-known/mcp/server-card.json), a browser WebMCP tool, an API catalog (RFC 9727) and an Agent Skills index. Regions: eu-hetzner, us-central, ap-tokyo, sa-east (omit for all).

How it works

config.py       — registry of providers + this node's REGION (env)
probe.py        — network probe (DNS→TCP→TLS→TTFB, stdlib, no key) + inference probe (TTFT, needs key)
run.py          — one probe cycle across all providers (run on a schedule)
db.py           — SQLite time-series (the accumulated measurement archive)
aggregate.py    — measurements → p50 / p95 / uptime rankings per region & provider
sitegen.py      — rankings → static site (JSON API, OpenAPI, llms.txt, schema.org, MCP surface)
ingest.py       — central endpoint that collects measurements from remote probe nodes
ship.py         — probe node → central node shipper (watermark-based, never loses data on outage)
deprecations.py — model deprecation/migration calendar (only verified, sourced entries)

Each probe node runs with its own REGION, measures every provider, and writes to the time-series. For multi-region, remote nodes ship their measurements to a central node that aggregates and builds the site.

Run it yourself (no keys needed)

git clone https://github.com/mazamaka/llm-latency-tracker
cd llm-latency-tracker
REGION=local python3 run.py         # take edge-latency measurements
python3 aggregate.py --region local # see the ranking from this location

Runs on plain Python 3.12+ (standard library). httpx / loguru are optional.

Inference probes (real TTFT):

cp .env.example .env                # add keys for the providers you want to measure
pip install -r requirements.txt
REGION=local python3 run.py
python3 aggregate.py --region local --type inference

Build the site locally:

BASE_URL=https://example.com python3 sitegen.py   # → ./site/
python3 -m pytest -q                              # tests

See deploy/ for a container + a generic multi-region deployment guide.

Contributing

Especially welcome:

• New providers — add a Provider(...) entry in config.py (host + public models endpoint is enough for edge probes).
• New regions — spin up a probe node in a new location and ship to a central node.
• Fixes & tests — CI runs pytest + ruff on every push.

See CONTRIBUTING.md for dev setup, how to add a provider/region, and PR guidelines. Please keep the project's principle: measured, not scraped, and honest about the dataset's age.

License

• Code: MIT
• Data (rankings, API output): CC-BY-4.0 — attribute llmlatency.dev.