Compare Text-to-Speech Models and API Pricing

Sarvam AI: Bulbul V2

sarvam

Lowest price

Bulbul v2 is a high-speed, cost-effective TTS model supporting 11 Indian languages. It is distinguished by its 'Just Like India' authentic regional accents and offers granular control over pitch, speed, and volume. Optimized for real-time synthesis in customer service and e-learning applications.

Sarvam AI: Bulbul V3

sarvam

Bulbul v3 is a production-grade text-to-speech model optimized for 11 Indian languages. It features native support for code-mixed speech, professional voice cloning, and industry-leading stability in telephony environments (8 kHz). It automatically infers prosody, emphasis, and emotional tone.

Fishaudio: S1

openrouter

Fish Audio S1 is a multilingual text-to-speech model capable of generating highly expressive speech. It utilizes a fixed vocabulary of preset emotion tags enclosed in parentheses at the beginning of sentences (e.g., sound effects, tone markers) to steer the emotion and delivery of the generated voice.

Fishaudio: S2 Pro

openrouter

Fish Audio S2 Pro is an advanced 4B parameter open-weight text-to-speech model built on a dual-autoregressive architecture. It supports approximately 80 languages and introduces fine-grained, word-level inline tag control, allowing users to embed open-ended natural language instructions inside square brackets directly in the script (e.g., [whispering], [pitch up]). It outputs 44.1 kHz audio and natively supports zero-shot voice cloning from a reference clip.

Fishaudio: S2.1 Pro

openrouter

Fish Audio S2.1 Pro is a state-of-the-art production-grade neural speech synthesis model optimized for ultra-low latency. With a Time-to-First-Audio (TTFA) as low as ~70-90ms, it is built for live conversational AI and turn-taking dialogue systems. It natively supports 83 languages without separate endpoints, features high-consistency voice cloning from reference audio, and excels at natural prosody for long-form narration.

Minimax: Speech 2.8 Turbo

minimax

MiniMax Speech 2.8 Turbo is the speed-optimized variant of MiniMax's flagship text-to-speech model. Delivering sub-250 millisecond latency, it provides fast, natural, and expressive voice synthesis ideal for real-time applications like conversational AI, voice agents, and interactive experiences. It retains the core advanced capabilities of the HD tier—including 40+ language support, rapid 10-second voice cloning, emotion control, and native sound tags—while prioritizing high-throughput generation and cost-efficiency.

Minimax: Speech 2.8 HD

minimax

MiniMax Speech 2.8 HD is the flagship studio-grade text-to-speech model from MiniMax. Built on an autoregressive Transformer architecture with a Flow-VAE decoder, it delivers highly expressive, broadcast-ready voice synthesis. It features native sound tags for realistic paralinguistic sounds (such as laughs, sighs, and breaths), robust emotion control, and high-fidelity voice cloning from just 10 seconds of audio. Supporting over 40 languages, it is optimized for professional audiobook narration, podcast production, and high-end video voiceovers.

XAI: Grok Imagine Video 1.5

grok

Grok Imagine Video 1.5 is xAI's advanced video model built on the Aurora-2 engine. Its standout feature is native one-pass audio generation, which produces synchronized dialogue (lip-sync), sound effects, and background music simultaneously with the video. Supporting resolutions up to 1080p and durations up to 15 seconds, it allows for complex workflows including text-to-video, image-to-video, video extension, and multi-image reference guidance to maintain consistent styles and characters.