SLNG // in partnership with leading voice labs
Adaptive execution
The perfect execution path for every turn
A 16-turn call. 48 model calls. Same path, same cost — whether it's reasoning or repeating a consent speech for the hundredth time. SLNG routes every turn through the execution path it actually needs.
Decision points
STT model selection
Inference tier routing
TTS path optimisation
Regional execution
Global Execution layer
US$ 0.0033 / agent minute
Better execution that brings better outcomes.
Keep your orchestrator
Livekit, Pipecat, custom. Your application code stays the same.
Keep your LLM
Keep your existing model and provider. SLNG routes, optimizes, and reduces cost on every call.
Keep your STT & TTS models
Bring your existing contract and provider. Or choose from SLNG // 30+ model catalogue.
Plug in three endpoints. Nothing else changes
STT
1curl -X POST https://api.slng.ai/v1/stt \
2 -H "Authorization: Bearer YOUR_KEY" \
3 -H "Content-Type: application/json"curl -X POST https://api.slng.ai/v1/llm \
4 -H "Authorization: Bearer YOUR_KEY" \
5 -H "Content-Type: application/json"LLM
1curl -X POST https://api.slng.ai/v1/llm \
2 -H "Authorization: Bearer YOUR_KEY" \
3 -H "Content-Type: application/json"TTS
1curl -X POST https://api.slng.ai/v1/tts \
2 -H "Authorization: Bearer YOUR_KEY" \
3 -H "X-Slng-Provider-Key: YOUR_PROVIDER_KEY" \
4 -H "Content-Type: application/json"Continuous optimization
Every call improves the next one
Every call teaches the system. Model selection gets sharper, latency drops, and your cost per minute falls automatically, without touching a line of code.
Stack what you need
Optional add-on to the Execution Layer.
STT — US$ 0.0033 / agent minute
Best model per turn · Multi-language · Multi-provider · In-region
TTS — US$ 0.0033 / agent minute
Sub-100ms TTFB · PII-safe delivery · Multi-provider · In-region
Model labs
Gradium · Deepgram · Speechmatics · AssemblyAI · Soniox · Whisper · Gladia · pyannoteAI · Voxtral · Savram AI + more
Model labs
Gradium · Rime · Deepgram · Cartesia · InWorld · Savram AI · Soniox · KugelAudio · MURF.AI + more
Getting started
Live instantly. Results within 24hrs
Send your existing call flow. We run it in-region and show you the numbers against your current setup.
1. Add your keys
Bring your own keys for STT, LLM, and TTS. We never store your credentials.
2. Point to SLNG //
Direct your orchestrator to SLNG endpoints for STT, LLM, and TTS.
3. See the results
Give it 24 hours. Your dashboard shows savings, latency, and quality vs. baseline.
What is the SLNG execution layer?
The infrastructure between your orchestrator and your models. It routes each call to the right model, caches repeated patterns, redacts PII, cancels noise, and logs everything: cost, latency, region, provider, per step. You keep your existing code. SLNG handles the layer underneath. The execution layer runs in 11 sovereign hubs across Americas, Europe, and Asia Pacific.
How is SLNG priced?
US$ 0.0033 per agent minute for the execution layer. Same price as every other region. STT and TTS add-ons are each US$ 0.0033 per agent minute with model costs included. No contracts, no minimums, no regional surcharges.
Can I bring my own model API keys?
Yes. BYOK is the default. Bring your existing OpenAI, Anthropic, Deepgram, or ElevenLabs keys. The SLNG execution layer routes through them, adding routing, caching, and observability without changing your provider contracts.
Is SLNG suitable for regulated environments?
Yes. SLNG enforces region and country rules at runtime. Enterprise plans add residency, retention, auditability, and SLA-backed guarantees for regulated workloads.
What does "per agent minute" mean?
Agent minute is the length of the call, not the amount of audio processed. A 3-minute call is 3 agent minutes regardless of how much silence or overlap it contains. SLNG bills per agent minute. Model providers typically bill per audio minute. SLNG simplifies this.
How is SLNG different from calling voice AI providers directly?
When you call voice models or LLM directly, you manage routing, failover, cost, and compliance yourself. SLNG sits between your orchestrator and your providers, adding per-turn model selection, smart caching, PII redaction, and regional compute. Your providers stay the same. Your cost and latency go down.
How does regional compute reduce voice AI latency?
A voice call from Mumbai hitting US servers adds 200ms+ of network round-trip before the model starts processing. When STT, LLM, and TTS all run in the same region as your caller, that round-trip disappears. Observed result: ~39% less turn latency in production.
Does SLNG keep my voice AI data stay in-region?
Yes. Audio processed in a region stays in that region. Data residency is enforced at the routing layer, not promised in documentation. Every call is logged with region, provider, model, and timestamp. SLNG is ISO 27001 certified, HIPAA compliant, and GDPR compliant.
How do I integrate SLNG with my voice AI stack?
Swap your STT, LLM, and TTS endpoints to SLNG. Add one header (X-Region) to select your region. No changes to your orchestrator, your models, or your agent logic. Works with LiveKit, Pipecat, Cognigy, or any custom stack.
Stay in the loop
Unmuted.
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