What SLNG does
The LLM router sits between ElevenLabs and your model
Fewer model calls per conversation.
Simple turns
Confirmations, greetings, consent speech, hold responses handled locally.
Complex turns
Reasoning, decision-making, ambiguous input go to your model as normal.
The result
Fewer LLM calls. Lower cost. Same output quality.
One change in your agent config
Same voice. Same agent logic. Same plan.
1"custom_llm": {
2 "url": "{region}.llm-router.slng.ai"
3}
Global Execution layer
US$ 0.0033 / agent minute
The perfect execution path for every turn.
LLM routing
Per-turn model selection and cost optimization.
PII redaction
Personally identifiable data stripped before it leaves the hub.
TTS smart caching
Repeated TTS responses served from cache. Provider never gets called.
Getting started
Live instantly. Results within 24hrs
Swap the URL in your agent config. We show you the numbers against your current LLM costs.
1. Get your SLNG key
Sign up at app.slng.ai. Get your API key.
2. Update your ElevenLabs config
Agent settings → LLM → Custom LLM → set Server URL
3. See the results
Give it 24 hours. Your dashboard shows LLM cost, latency, and quality vs. baseline.
How does the LLM router reduce cost?
Most turns are simple. The router handles those locally without calling your LLM. Complex turns go to your model as normal. Fewer calls per conversation.
How much does it cost?
US$ 0.0033 per agent minute. No contracts. No minimums. Your voice platform billing is separate.
Does this replace ElevenLabs?
No. ElevenLabs handles voice. SLNG handles the LLM layer underneath.
Is my data safe?
PII redaction built in. ISO 27001 certified. HIPAA compliant. GDPR compliant. SOC 2 Type II in audit.
Do I need to change my ElevenLabs plan?
No. SLNG is a separate service. No changes to your plan, tier, or payment method.
How does latency improve?
Simple turns skip the LLM round-trip entirely. 39% less turn latency on average.
Can SLNG handle STT and TTS too?
Yes. 30+ models across STT and TTS, running in 11 regions. If you want to move beyond ElevenLabs for voice, the full stack is there. docs.slng.ai
Stay in the loop
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