{"slug":"cartesia","name":"Cartesia","domain":"cartesia.ai","verdict":"As of 2026-07-13, ChatGPT, Claude, Gemini, Grok collectively rank Cartesia #2 of 9 for ai voice cloning api (one of 2 leaderboards it appears on). Source: https://modelsagree.com/product/cartesia (modelsagree.com, CC BY 4.0).","best_rank":2,"categories":2,"brief":{"category":"best-ai-voice-cloning-api","title":"Best AI voice cloning API","rank":2,"of":9,"top":"ElevenLabs","day":"2026-07-17","why":[{"t":"Best-in-class low latency","m":["Claude","Gemini","ChatGPT","Grok"],"q":"best-in-class low latency"},{"t":"Instant cloning from short audio","m":["Claude","ChatGPT","Grok"],"q":"instant cloning from very short clips (3-10s)"},{"t":"Streaming built for voice agents","m":["Claude","Gemini","ChatGPT","Grok"],"q":"websocket streaming built for voice agents"},{"t":"Affordable multilingual real-time specialist","m":["Claude","ChatGPT","Grok"],"q":"affordable entry pricing"}],"gap":[{"t":"Professional cloning fidelity","m":["ChatGPT","Claude","Gemini","Grok"],"q":"Professional Voice Cloning is the most faithful commercial clone available"},{"t":"Emotional expressiveness and prosody","m":["ChatGPT","Claude","Gemini","Grok"],"q":"voice cloning fidelity and emotional prosody"},{"t":"Mature dubbing and agent tooling","m":["ChatGPT","Claude","Grok"],"q":"mature SDKs, dubbing, and agent tooling"}],"fix":[{"t":"Enhance cloning fidelity","m":["ChatGPT","Claude","Grok"],"q":"enhance overall cloning fidelity"},{"t":"Improve emotional range and expressiveness","m":["Claude","Gemini"],"q":"Audio output lacks the deep emotional range"},{"t":"Strengthen long-form consistency and pacing","m":["ChatGPT","Gemini","Grok"],"q":"long-form consistency for non-real-time content"}]},"entries":[{"slug":"best-ai-voice-cloning-api","title":"Best AI voice cloning API","rank":2,"of":9,"score":13,"appearances":4,"modelRanks":{"ChatGPT":3,"Claude":2,"Gemini":2,"Grok":4},"reason":"The realtime pick — sub-100ms model latency from its state-space architecture, instant cloning from seconds of audio, websocket streaming built for voice agents, and aggressive pricing; near-tie with MiniMax, ranked ahead on latency and Western enterprise readiness","reasons":[{"model":"Claude","reason":"The realtime pick — sub-100ms model latency from its state-space architecture, instant cloning from seconds of audio, websocket streaming built for voice agents, and aggressive pricing; near-tie with MiniMax, ranked ahead on latency and Western enterprise readiness"},{"model":"Gemini","reason":"Provides best-in-class low latency with sub-100ms time-to-first-audio (TTFA) and highly optimized streaming support under the assumption that system responsiveness is the key driver of user experience."},{"model":"ChatGPT","reason":"Near-tie with Fish Audio for practitioners building live agents; exceptionally responsive streaming, natural conversational delivery, 42 languages, strong instant cloning, and affordable entry pricing make it the best real-time specialist."},{"model":"Grok","reason":"fastest low-latency real-time TTS (sub-90ms), instant cloning from very short clips (3-10s), strong for voice agents and interactive apps with solid multilingual support"}],"fixes":[{"model":"ChatGPT","fix":"Its highest-fidelity professional cloning requires a costlier plan and is less proven for long-form dramatic narration than ElevenLabs."},{"model":"Claude","fix":"Clone fidelity and expressiveness on hard voices trail ElevenLabs' professional cloning, and the feature ecosystem (dubbing, voice library, editing) is thinner"},{"model":"Gemini","fix":"Audio output lacks the deep emotional range and natural narrative pacing of ElevenLabs, tending to sound flatter in long-form generation."},{"model":"Grok","fix":"enhance overall cloning fidelity and long-form consistency for non-real-time content"}],"updated":"2026-07-13","rank_history":{"days":["2026-07-11","2026-07-12","2026-07-13"],"ranks":[2,2,2]},"api":"https://modelsagree.com/api/v1/best/best-ai-voice-cloning-api.json"},{"slug":"best-speech-to-speech-apis-for-real-time-voice-assistants","title":"Best Speech-to-Speech APIs for Real-Time Voice Assistants","rank":7,"of":9,"score":3,"appearances":1,"modelRanks":{"Grok":3},"reason":"Ultra-low latency (sub-100ms TTFA in many configs) state-space models optimized for real-time conversational voice agents; strong emotional expression and streaming performance making it ideal for responsive, natural turn-taking in modular stacks.","reasons":[{"model":"Grok","reason":"Ultra-low latency (sub-100ms TTFA in many configs) state-space models optimized for real-time conversational voice agents; strong emotional expression and streaming performance making it ideal for responsive, natural turn-taking in modular stacks."}],"fixes":[{"model":"Grok","fix":"Requires more integration work for full STS (not fully native single-call like OpenAI); voice quality and language support lag slightly behind specialists in non-English or highly expressive long-form scenarios."}],"updated":"2026-07-18","api":"https://modelsagree.com/api/v1/best/best-speech-to-speech-apis-for-real-time-voice-assistants.json"}],"page":"https://modelsagree.com/product/cartesia","check":"https://modelsagree.com/check?q=Cartesia","updated":"2026-08-10T18:18:45.051Z","attribution":"modelsagree.com, CC BY 4.0"}