Stack Optimizer
Find the fastest voice stack for your use case.
Live English benchmarks across 10 providers. Tell us what you're building — latency, cost, quality — and we'll rank the best stacks in seconds.
OpenAI · Deepgram · Cartesia · ElevenLabs · Google · AssemblyAI · Anthropic · xAI · Cerebras · Groq
Your recommendation will appear here.
Enter a use case above and hit Optimize.
Developer Install
Wire this into Cursor or Claude Code in one command.
The Speko MCP server exposes live stack recommendations directly inside your editor. Zero context switching.
$ npx @spekoai/mcp initWorks with Cursor, Claude Code, Windsurf, and any MCP-compatible client.
Live Leaderboard
Best stacks by latency, cost, and accuracy.
Ranked by p95 latency. Updated daily from Speko realtime probes. Lower latency and WER is better.
Provider Deep Dives
Explore individual providers.
OpenAI Realtime
Fastest S2S in English. $0.06/min with native interruption handling.
Deepgram Nova-3
Lowest WER for English and Spanish. Best value for high-volume pipelines.
Cartesia Sonic
Sub-100ms TTFB. Most natural-sounding TTS under $0.005/min.