SpeechifyAI
Best Voice Agent Platforms 2026: 9 Compared on Real All-In Cost
The voice agent platforms developers actually evaluate in 2026, compared on what a minute really costs once the LLM, speech, and telephony are added.
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SpeechifyAI Changelog Voice agent multilingual language list is now server-driven
GET /v1/agents/voices now returns a multilingual_languages field listing every language an agent may declare in additional_languages, so language pickers render from the live set instead of a hard-coded list that drifts out of date.
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SpeechifyAI Changelog Widget error reporting and startAgent connect-failure contract
The voice-agent widget now reports real failure codes on widget.error instead of always-unknown, and startAgent() connect failures arrive on the promise rejection rather than duplicating across onError and the rejection channel.
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SpeechifyAI Changelog Models list now reports per-model endpoints and curated-voice flag
GET /v1/audio/models now returns endpoints and curated_voices per model, so a model picker can show only valid synthesis routes and reject unsuitable voice selections before the request reaches the server.
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SpeechifyAI API Multilingual voiceover with the Speechify API and simba-3.0
Generate the same script in English, German, Spanish, French, Italian, and Portuguese with the Speechify TTS API. Pick a simba-3.0 voice for each locale, call POST /v1/audio/speech per language, keep the key server-side.
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SpeechifyAI Changelog Widget now served from cdn.speechify.ai; new flow_budget_exhausted call end reason
New widget embeds load from cdn.speechify.ai - a floating URL that tracks the current release, plus immutable version pins for change-controlled sites - and the Conversation resource's end_reason field now documents flow_budget_exhausted, a runtime backstop for looping calls.
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SpeechifyAI Changelog Widget bundle compression and session spend-limit 402
The voice-agent widget is now served compressed - 676 kB down to 190 kB when it was measured - supports version-pinned URLs with subresource integrity, and session creation returns 402 when a spend limit or budget is hit rather than a 500.
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SpeechifyAI Changelog TTS 404s now name the fix instead of a generic not-found
POST /v1/audio/speech, /stream, and /stream/with-timestamps now return voice_not_found or a model-not-found message on a missing voice or model, instead of an opaque passthrough 404.
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SpeechifyAI API Speech generation in the Vercel AI SDK with Speechify
The AI SDK ships generateSpeech() but no Speechify provider. So we wrote one: a dependency-free custom speech model that maps POST /v1/audio/speech onto the SDK's SpeechModelV4 interface, key held server-side in a Next.js route.
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SpeechifyAI Changelog Free tier TTS requests get a burst allowance
Free-tier /v1/audio/* requests get a 10-request burst bucket instead of capping at the 1 req/s sustained rate, so a first quickstart script no longer 429s on its second call.
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SpeechifyAI Changelog Every public API header now has one canonical, un-prefixed name
Speechify-Request-Id and RateLimit-* are now the canonical header names across the public API; the old X-prefixed spellings keep working until 2027-07-24.
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SpeechifyAI Changelog Voice agents can now switch language mid-call
One agent serves multiple languages in a single session, with no transfer and no dropped context - configure it with additional_languages.
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SpeechifyAI API Simba 3.2 is our recommended TTS model: what changed and how to migrate
simba-3.2 is now the recommended Speechify TTS model, and GET /v1/audio/models lets you discover it at runtime instead of hardcoding a model list. What shipped, the voice allow-list, and how to move off simba-3.0.
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SpeechifyAI Best TTS Providers 2026: Comparison of the Top 10 APIs
The top 10 text-to-speech APIs of 2026, benchmarked on the independent Artificial Analysis Speech Arena. Simba 3.2 is #1 on Artificial Analysis at $6 to $10 per million characters, above every ElevenLabs, Cartesia and Google model. Self-hosted models left out.
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SpeechifyAI Changelog Streaming TTS now carries word-level speech marks
A new endpoint streams speech marks alongside audio, so captions and text highlighting no longer need the non-streamed API.
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SpeechifyAI Changelog Agent test runs get clear 402 errors on balance and plan tier checks
All four agent test-run endpoints now document 402 for a depleted balance or an exhausted spend limit, the single-run path finally takes the admission gate its siblings already had, and an explicit over-tier model override is refused instead of being honoured unchecked.
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SpeechifyAI Changelog Simba 3.0 now speaks six European languages; Simba 1.6 marked legacy
Simba 3.0 is no longer English-only — it now officially covers English plus German, Spanish (ES/MX), French, Italian, and Brazilian Portuguese. The same release flags the Simba 1.6 models as legacy and confirms Simba 3.0 accepts cloned voices.
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SpeechifyAI Changelog Set a per-agent maximum call duration
Voice agents now carry a max_call_duration_seconds field — a hard per-agent wall-clock cap on a single call. When a call reaches it, the agent ends automatically; null keeps the previous behavior of bounding calls only by your plan's ceiling.
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SpeechifyAI Changelog Filter GET /v1/voices by type, locale, gender, and model
GET /v1/voices now accepts type, locale, gender, and model query filters, applied before pagination so pages stay full — so you can fetch, say, only English cloned voices that support Simba 3.2 in a single call.
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SpeechifyAI Changelog Per-plan API rate and concurrency limits are now published
The API limits reference now lists per-plan rate limits (requests per second, plus an Agents burst) and concurrency limits for both the TTS and Agents surfaces, and 429 responses carry a docs_url plus distinct rate_limited and concurrency_limited error codes.
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SpeechifyAI API Building an AI Voice Cloning Web App with Next.js and Speechify
Clone a voice from a browser upload, synthesize speech with it, and keep your API key server-side. A working Next.js voice cloning app built on the Speechify API, no GPU required.
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SpeechifyAI Changelog Simba 3.0 now supports cloned and personal voices
simba-3.0 accepts cloned and personal voice_id values self-serve on POST /v1/audio/speech and /v1/audio/stream, the same way simba-english does; simba-3.2 cloning still requires manual approval.
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SpeechifyAI API Streaming TTS directly to the browser with Web Audio API
Stream Speechify TTS as raw PCM, keep the API key server-side, and schedule each chunk into the browser's Web Audio API for low-latency playback.
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SpeechifyAI API Add a better voice to Deepgram's Voice Agent with Speechify
Point Deepgram Voice Agent at the open-source tts-shims OpenAI-compatible proxy to speak with a Speechify voice. The shim answers Deepgram's open_ai TTS request and keeps your Speechify key server-side.
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SpeechifyAI API Controlling Emotion and Timing in TTS with SSML
Use SSML emotion tags, pauses, prosody, emphasis, and pronunciation aliases to shape Speechify TTS output from one API request.
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SpeechifyAI Changelog Cloned voices can now run on Simba 3.2 with Speechify approval
Personal cloned voices can now be synthesized on the curated Simba 3.2 model. Given the model's quality bar, each clone is gated on manual Speechify approval of the voice key, while simba-english and simba-multilingual keep serving clones self-serve.
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SpeechifyAI Changelog List available TTS models at runtime with GET /v1/audio/models
A new GET /v1/audio/models endpoint returns the models you can pass as the model parameter, each with a default and recommended flag plus the languages it supports — so a model picker can be built at runtime instead of hardcoding the list.
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SpeechifyAI Changelog Simba 3.2 is live on the TTS API as the recommended English model
Simba 3.2 is now available on POST /v1/audio/speech and /v1/audio/stream — a streaming-native Simba 3 model with lower TTFB, richer expressivity, and a curated voice allow-list, recommended for new English integrations.
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SpeechifyAI WE'RE NUMBER ONE
Simba 3.2 is #1 on Artificial Analysis, the independent TTS benchmark. On Voice Arena's blind, listener-voted board it's the #1 real-time voice and #1 on price — the model above it isn't real-time, the nearest at its quality costs 7x more. Nothing you can ship beats it.
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SpeechifyAI API Building an automated audiobook pipeline with the Speechify TTS API
Turn long-form ePub or Markdown into a single narrated chapter MP3 with a runnable Python demo: chunk on sentence boundaries, synthesize each chunk, stitch with ffmpeg.
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SpeechifyAI Changelog API keys can now enforce monthly USD spend limits
Speechify API keys can now carry a monthly USD spend limit, returning 402 spend_cap_exceeded once a key reaches its budget for the calendar month.
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SpeechifyAI API Switch to Speechify from inside speech-sdk
Speechify is now a direct provider in speech-sdk. Switch existing calls over with a factory function and an API key, no new client required.
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SpeechifyAI Changelog TTS now accepts sample-rate and bitrate-specific output formats
Speechify TTS speech and streaming endpoints now accept output_format values like pcm_16000, ulaw_8000, and bitrate-tuned mp3 variants without changing existing callers.
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SpeechifyAI Changelog The API now exposes more safety limits at the edge
Speechify added rate-budget response headers, global JSON body-size handling, clearer 413 and 415 errors, and pre-auth IP throttling for token-mint paths.
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SpeechifyAI API Dynamic video narration using the Speechify Voice Cloning API
Clone a voice from a short sample and use it to narrate dynamic video content programmatically via the REST API.
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SpeechifyAI Changelog Workspace webhooks now have endpoint management and versioned payloads
Speechify workspace webhooks now support managed endpoints, delivery history, a resource.action event catalog, combined signatures, and per-endpoint API versions.
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SpeechifyAI Changelog API keys now carry clearer scopes and usage attribution
Speechify API keys now have cleaner scope tiers, service-account inheritance, and usage attribution that makes spend easier to trace back to a workload.
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SpeechifyAI API How we think about latency in SpeechifyAI voice agents
Baseten published a case study on the SpeechifyAI voice agent stack. This is our view on why model co-location matters for live calls.
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SpeechifyAI Changelog Service accounts are now machine identities for the Speechify API
Service accounts give Speechify API workloads their own identity, scope ceiling, key rotation flow, usage attribution, and short-lived child keys for agent sessions.
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SpeechifyAI API Building real-time captions with Speechify TTS speech marks
Use the Speechify API's word-level timestamps to generate accurate WebVTT captions for your synthesized audio.
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SpeechifyAI Changelog Build and Agents API fields moved toward one naming shape
Build and Agents received a small API naming cleanup on June 28, including not_specified voice gender and several Agents field-name migrations.
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SpeechifyAI API Streaming TTS in Python with Speechify
How to stream audio from the Speechify TTS API in Python using the SDK and native requests. Covers chunked streaming to disk and piping audio to a player without waiting for the full payload.
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SpeechifyAI Changelog GET /v1/voices now returns a pagination-ready envelope
The Build API moved GET /v1/voices from a bare array to a voices object with pagination fields, making the response shape safer for SDKs and future growth.
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SpeechifyAI Changelog Idempotency-Key is now wired across side-effect API calls
Speechify now supports Idempotency-Key on the API calls most likely to be retried, including calls, batches, purchases, spend paths, and service-account key minting.
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SpeechifyAI Changelog Speechify-Version gives API clients a stable date pin
Speechify APIs now support the Speechify-Version header, so HTTP clients can pin a dated contract while SDKs send their build-date version automatically.
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SpeechifyAI API Using TTS in Node.js with Speechify
A practical guide to synthesizing speech in Node.js using the Speechify TTS API. Covers installation, a basic synthesis call, streaming audio to disk, and what to reach for next.
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SpeechifyAI Changelog TTS stream responses are documented as raw audio streams
The Build docs now spell out that POST /v1/audio/stream returns chunked raw audio, not JSON, with clearer response content types and codec notes.
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SpeechifyAI Changelog Agents now expose live operations APIs for analytics and intervention
Speechify Agents added live transcript streaming, take-over actions, per-action RBAC, analytics queries, and saved dashboard APIs for monitoring live voice operations.
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SpeechifyAI API Launching the Speechify Cookbook
A small, public repo of runnable Speechify recipes. Pick a folder, drop in your API key, run it. TypeScript and Python today, SDK and native REST side by side.
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SpeechifyAI API Hello Speechify Developers
Welcome to the new Speechify developer blog. Expect updates from the AI and labs teams, product news, collaborations, and technical guides for the Speechify TTS API.
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SpeechifyAI Changelog Voice Agents API is now public beta
Speechify Voice Agents is now publicly documented, with guides and API reference pages for agents, conversations, tools, knowledge bases, calls, and monitoring.