# Novita AI MiniMax Speech 2.6 HD Preview ASYNC API | High-Definition Text-to-Speech > For the complete documentation index, see [llms.txt](/llms.txt). Markdown is available with `Accept: text/markdown` and `.md` URL variants. Source: /docs/api-reference/model-apis-minimax-speech-2.6-hd-async # MiniMax Speech-2.6-hd Async Long TTS POST / v3 / async / minimax-speech-2.6-hd Try it MiniMax Speech-2.6-hd Async Long TTS cURL ``` curl --request POST \ --url https://api.novita.ai/v3/async/minimax-speech-2.6-hd \ --header 'Authorization: <authorization>' \ --header 'Content-Type: <content-type>' \ --data ' { "text": "<string>", "voice_setting": { "speed": 123, "vol": 123, "pitch": 123, "voice_id": "<string>", "emotion": "<string>", "text_normalization": true }, "audio_setting": { "sample_rate": 123, "bitrate": 123, "format": "<string>", "channel": 123 }, "pronunciation_dict": { "tone": [ {} ] }, "language_boost": "<string>", "voice_modify": { "pitch": 123, "intensity": 123, "timbre": 123, "sound_effects": "<string>" } } ' ``` 200 ``` { "task_id": "<string>" } ``` MiniMax’s high-definition text-to-speech model, Compared to Speech 02 released in May, Speech 2.6 has three major breakthroughs: stronger multilingual expressiveness, more accurate voice replication, and broader coverage with 40 languages. Best suited for long-form text-to-speech generation, such as entire books. Task queue times may be longer. For short sentence generation, voice chat, or online social scenarios, we recommend using [synchronous TTS](/docs/api-reference/model-apis-minimax-speech-2.6-hd). ## [​](#request-headers) Request Headers [​](#param-content-type) Content-Type string required Supports: `application/json` [​](#param-authorization) Authorization string required Bearer authentication format, for example: Bearer {{API Key}}. ## [​](#request-body) Request Body [​](#param-text) text string required The text to be synthesized. Maximum length: 50,000 characters. [​](#param-voice-setting) voice_setting object required Show properties [​](#param-speed) speed number Range: [0.5, 2], default is 1.0.Controls the speech rate of the generated audio. Optional. Higher values result in faster speech. [​](#param-vol) vol number Range: (0, 10], default is 1.0.Controls the volume of the generated audio. Optional. Higher values result in louder audio. [​](#param-pitch) pitch number default:0 Range: [-12, 12], default is 0.Controls the pitch of the generated audio. Optional. 0 means original timbre. The value must be an integer. [​](#param-voice-id) voice_id string The requested voice ID.Supports both system voices (ID) and cloned voices (ID). The available system voice IDs are as follows: - Wise_Woman - Friendly_Person - Inspirational_girl - Deep_Voice_Man - Calm_Woman - Casual_Guy - Lively_Girl - Patient_Man - Young_Knight - Determined_Man - Lovely_Girl - Decent_Boy - Imposing_Manner - Elegant_Man - Abbess - Sweet_Girl_2 - Exuberant_Girl [​](#param-emotion) emotion string Controls the emotion of the synthesized speech.Currently supports 7 emotions: happy, sad, angry, fearful, disgusted, surprised, neutral.Allowed values: `["happy", "sad", "angry", "fearful", "disgusted", "surprised", "neutral"]` [​](#param-text-normalization) text_normalization bool default:"false" This parameter supports English text normalization, which improves performance in number-reading scenarios, but this comes at the cost of a slight increase in latency. If not provided, the default is false. [​](#param-audio-setting) audio_setting object Show properties [​](#param-sample-rate) sample_rate number default:32000 Range: [8000, 16000, 22050, 24000, 32000, 44100]The sample rate of the generated audio. Optional, default is 32000. [​](#param-bitrate) bitrate number default:128000 Range: [32000, 64000, 128000, 256000]The bitrate of the generated audio. Optional, default is 128000. This parameter only applies to mp3 audio format. [​](#param-format) format string default:"mp3" The audio format of the output. Default is mp3. Options: `mp3`, `pcm`, `flac`, `wav`. wav is only supported for non-streaming output. [​](#param-channel) channel number default:1 Number of audio channels. Default is 1 (mono). Options:1: mono2: stereo [​](#param-pronunciation-dict) pronunciation_dict object Show properties [​](#param-tone) tone list Replacement of text, symbols and corresponding pronunciations that require manual handling. Replace the pronunciation (adjust the tone/replace the pronunciation of other characters) using the following format:[“omg/oh my god”]For Chinese texts, tones are replaced by numbers, with 1 for the first tone (high), 2 for the second tone (rising), 3 for the third tone (low/dipping), 4 for the fourth tone (falling), and 5 for the fifth tone (neutral). [​](#param-language-boost) language_boost string default:"null" Enhances recognition of specified minor languages and dialects. Setting this parameter can improve speech performance in the specified language/dialect scenarios. If the minor language type is not clear, you can set it to “auto” and the model will automatically determine the language type. Supported values:`'Chinese', 'Chinese,Yue', 'English', 'Arabic', 'Russian', 'Spanish', 'French', 'Portuguese', 'German', 'Turkish', 'Dutch', 'Ukrainian', 'Vietnamese', 'Indonesian', 'Japanese', 'Italian', 'Korean', 'Thai', 'Polish', 'Romanian', 'Greek', 'Czech', 'Finnish', 'Hindi', 'Bulgarian', 'Danish', 'Hebrew', 'Malay', 'Persian', 'Slovak', 'Swedish', 'Croatian', 'Filipino', 'Hungarian', 'Norwegian', 'Slovenian', 'Catalan', 'Nynorsk', 'Tamil', 'Afrikaans', 'auto'` [​](#param-voice-modify) voice_modify object Voice FX settings. Supported audio formats for this parameter: mp3, wav, flac Show properties [​](#param-pitch-1) pitch integer Pitch adjustment (darker/brighter). Range: [-100, 100]. Values closer to -100 generate a deeper (darker) voice; values closer to 100 produce a brighter voice. [​](#param-intensity) intensity integer Intensity adjustment (powerful/soft). Range: [-100, 100]. Values closer to -100 generate a more powerful sound; values closer to 100 result in a softer sound. [​](#param-timbre) timbre integer Timbre adjustment (magnetic/crisp). Range: [-100, 100]. Values closer to -100 make the voice more full/magnetic; values closer to 100 make it crisper. [​](#param-sound-effects) sound_effects string Sound effect setting (only one may be selected per request). Valid values: - `spacious_echo` (large space echo) - `auditorium_echo` (auditorium broadcast) - `lofi_telephone` (telephone distortion) - `robotic` (robotic effect) ## [​](#response) Response [​](#param-task-id) task_id string Use the task_id to request the [Task Result API](/docs/api-reference/model-apis-task-result) to retrieve the generated outputs. Last modified on February 5, 2026