Technical writing across Speechify Labs (voice AI research), SpeechifyAI (the product), SpeechifyAI API (developer-facing engineering), and the SpeechifyAI Changelog (platform-wide release notes).https://speechify.ai/en-ushttps://speechify.ai/blog/simba-3-tops-artificial-analysis-tts-leaderboard/https://speechify.ai/blog/simba-3-tops-artificial-analysis-tts-leaderboard/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.Mon, 06 Jul 2026 00:00:00 GMTLuke OliffSpeechifyAIsimbaartificial-analysisvoice-arenabenchmarksttspricinglaunchhttps://speechify.ai/blog/building-an-automated-audiobook-pipeline-with-the-speechify-tts-api/https://speechify.ai/blog/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.Fri, 03 Jul 2026 00:00:00 GMTLuke OliffSpeechifyAI APIttsaudiobookspythonpipelinehttps://speechify.ai/blog/api-key-monthly-spend-limits/https://speechify.ai/blog/api-key-monthly-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.Thu, 02 Jul 2026 00:00:00 GMTLuke OliffSpeechifyAI Changelogspend-limitsapi-keysbillingsecurityhttps://speechify.ai/blog/speechify-speech-sdk-provider/https://speechify.ai/blog/speechify-speech-sdk-provider/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.Thu, 02 Jul 2026 00:00:00 GMTLuke OliffSpeechifyAI APIspeech-sdktext-to-speechintegrationshttps://speechify.ai/blog/tts-output-format-sample-rate-bitrate/https://speechify.ai/blog/tts-output-format-sample-rate-bitrate/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.Thu, 02 Jul 2026 00:00:00 GMTLuke OliffSpeechifyAI Changelogttsaudio-formattelephonyapihttps://speechify.ai/blog/api-safety-limits-and-request-boundaries/https://speechify.ai/blog/api-safety-limits-and-request-boundaries/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.Wed, 01 Jul 2026 00:00:00 GMTLuke OliffSpeechifyAI Changelogapi-hardeningrate-limitserrorssecurityhttps://speechify.ai/blog/dynamic-video-narration-using-the-speechify-voice-cloning-api/https://speechify.ai/blog/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.Wed, 01 Jul 2026 00:00:00 GMTLuke OliffSpeechifyAI APIvoice-cloningvideorest-apitypescripthttps://speechify.ai/blog/workspace-webhooks-event-catalog-and-versioned-payloads/https://speechify.ai/blog/workspace-webhooks-event-catalog-and-versioned-payloads/Speechify workspace webhooks now support managed endpoints, delivery history, a resource.action event catalog, combined signatures, and per-endpoint API versions.Wed, 01 Jul 2026 00:00:00 GMTLuke OliffSpeechifyAI Changelogwebhooksapi-versioningsecurityagentshttps://speechify.ai/blog/api-key-scopes-and-usage-attribution/https://speechify.ai/blog/api-key-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.Tue, 30 Jun 2026 00:00:00 GMTLuke OliffSpeechifyAI Changelogapi-keysusagescopesbillinghttps://speechify.ai/blog/how-we-think-about-latency-in-speechifyai-voice-agents/https://speechify.ai/blog/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.Tue, 30 Jun 2026 00:00:00 GMTLuke OliffSpeechifyAI APIpartnershipbasetenvoice-agentslatencyhttps://speechify.ai/blog/service-accounts-for-api-keys/https://speechify.ai/blog/service-accounts-for-api-keys/Service accounts give Speechify API workloads their own identity, scope ceiling, key rotation flow, usage attribution, and short-lived child keys for agent sessions.Tue, 30 Jun 2026 00:00:00 GMTLuke OliffSpeechifyAI Changelogservice-accountsapi-keyssecurityagentshttps://speechify.ai/blog/building-real-time-captions-with-speechify-tts-speech-marks/https://speechify.ai/blog/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.Mon, 29 Jun 2026 00:00:00 GMTLuke OliffSpeechifyAI APIspeech-markscaptionsaccessibilitywebvtthttps://speechify.ai/blog/api-field-naming-cleanup-2026-06-28/https://speechify.ai/blog/api-field-naming-cleanup-2026-06-28/Build and Agents received a small API naming cleanup on June 28, including not_specified voice gender and several Agents field-name migrations.Sun, 28 Jun 2026 00:00:00 GMTLuke OliffSpeechifyAI Changelogapi-versioningsdkagentsbuildhttps://speechify.ai/blog/streaming-tts-in-python-with-speechify/https://speechify.ai/blog/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.Sat, 27 Jun 2026 00:00:00 GMTLuke OliffSpeechifyAI APIttspythonstreamingdeveloper-experiencehttps://speechify.ai/blog/voices-list-pagination-envelope/https://speechify.ai/blog/voices-list-pagination-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.Sat, 27 Jun 2026 00:00:00 GMTLuke OliffSpeechifyAI Changelogttsvoicespaginationsdkhttps://speechify.ai/blog/idempotency-key-for-side-effect-posts/https://speechify.ai/blog/idempotency-key-for-side-effect-posts/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.Fri, 26 Jun 2026 00:00:00 GMTLuke OliffSpeechifyAI Changelogidempotencyapi-reliabilitydeveloper-experiencehttps://speechify.ai/blog/speechify-version-api-date-pinning/https://speechify.ai/blog/speechify-version-api-date-pinning/Speechify APIs now support the Speechify-Version header, so HTTP clients can pin a dated contract while SDKs send their build-date version automatically.Thu, 25 Jun 2026 00:00:00 GMTLuke OliffSpeechifyAI Changelogapi-versioningsdkdeveloper-experiencehttps://speechify.ai/blog/using-tts-in-nodejs-with-speechify/https://speechify.ai/blog/using-tts-in-nodejs-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.Wed, 24 Jun 2026 00:00:00 GMTLuke OliffSpeechifyAI APIttsnodejstypescriptdeveloper-experiencehttps://speechify.ai/blog/tts-stream-response-behavior-clarified/https://speechify.ai/blog/tts-stream-response-behavior-clarified/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.Tue, 23 Jun 2026 00:00:00 GMTLuke OliffSpeechifyAI Changelogttsstreamingapi-referencehttps://speechify.ai/blog/agents-live-operations-apis/https://speechify.ai/blog/agents-live-operations-apis/Speechify Agents added live transcript streaming, take-over actions, per-action RBAC, analytics queries, and saved dashboard APIs for monitoring live voice operations.Mon, 22 Jun 2026 00:00:00 GMTLuke OliffSpeechifyAI Changelogagentsanalyticslive-callsoperationshttps://speechify.ai/blog/launching-the-speechify-cookbook/https://speechify.ai/blog/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.Mon, 22 Jun 2026 00:00:00 GMTLuke OliffSpeechifyAI APIcookbookttsdeveloper-experiencehttps://speechify.ai/blog/hello-speechify-developers/https://speechify.ai/blog/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.Fri, 19 Jun 2026 00:00:00 GMTLuke OliffSpeechifyAI APIannouncementdeveloper-experiencehttps://speechify.ai/blog/voice-agents-api-public-beta/https://speechify.ai/blog/voice-agents-api-public-beta/Speechify Voice Agents is now publicly documented, with guides and API reference pages for agents, conversations, tools, knowledge bases, calls, and monitoring.Thu, 11 Jun 2026 00:00:00 GMTLuke OliffSpeechifyAI Changelogagentspublic-betaapi-reference