Datasets:

gradium
/

tts-eval-customer-support-202608

item_id stringclasses 100 values	category stringclasses 2 values	criterion float64 1.1 2.3	criterion_name stringclasses 10 values	language stringclasses 5 values	sentence stringlengths 27 454
1.1-01	Atomic Criteria	1.1	Spelling	DE	Mein Nachname schreibt sich S-C-H-W-E-I-N-S-T-E-I-G-E-R.
1.1-01	Atomic Criteria	1.1	Spelling	EN	My surname is spelled H-I-G-G-I-N-B-O-T-H-A-M.
1.1-01	Atomic Criteria	1.1	Spelling	ES	Mi apellido se escribe E-C-H-E-V-E-R-R-Í-A.
1.1-01	Atomic Criteria	1.1	Spelling	FR	Mon nom de famille s'écrit D-E-S-C-H-A-M-P-S.
1.1-01	Atomic Criteria	1.1	Spelling	PT	O meu apelido escreve-se V-A-S-C-O-N-C-E-L-O-S.
1.1-02	Atomic Criteria	1.1	Spelling	DE	Die Initialen des Autors sind J.S.B., die des Verlegers C.F.G.
1.1-02	Atomic Criteria	1.1	Spelling	EN	The author's initials are J.R.R., the editor's are P.G.W.
1.1-02	Atomic Criteria	1.1	Spelling	ES	Las iniciales del autor son J.R.J., las del editor F.G.L.
1.1-02	Atomic Criteria	1.1	Spelling	FR	Les initiales de l'auteur sont A.D.G., celles de l'éditeur P.M.
1.1-02	Atomic Criteria	1.1	Spelling	PT	As iniciais do autor são F.P., as do editor E.Q.
1.1-03	Atomic Criteria	1.1	Spelling	DE	Die Stadt schreibt sich M, Ö, N, C, H, E, N, G, L, A, D, B, A, C, H.
1.1-03	Atomic Criteria	1.1	Spelling	EN	The town is spelled L, O, U, G, H, B, O, R, O, U, G, H.
1.1-03	Atomic Criteria	1.1	Spelling	ES	La ciudad se escribe G, U, A, D, A, L, A, J, A, R, A.
1.1-03	Atomic Criteria	1.1	Spelling	FR	La ville s'écrit V, A, L, E, N, C, I, E, N, N, E, S.
1.1-03	Atomic Criteria	1.1	Spelling	PT	A cidade escreve-se G, U, I, M, A, R, Ã, E, S.
1.1-04	Atomic Criteria	1.1	Spelling	DE	Das Medikament schreibt sich I-B-U-P-R-O-F-E-N.
1.1-04	Atomic Criteria	1.1	Spelling	EN	The medication is spelled A-C-E-T-A-M-I-N-O-P-H-E-N.
1.1-04	Atomic Criteria	1.1	Spelling	ES	El medicamento se escribe P-A-R-A-C-E-T-A-M-O-L.
1.1-04	Atomic Criteria	1.1	Spelling	FR	Le médicament générique s'écrit P-A-R-A-C-É-T-A-M-O-L.
1.1-04	Atomic Criteria	1.1	Spelling	PT	O medicamento genérico escreve-se P-A-R-A-C-E-T-A-M-O-L.
1.1-05	Atomic Criteria	1.1	Spelling	DE	Ist es M-A-N-N oder N-A-N-N? Bitte alles buchstabieren.
1.1-05	Atomic Criteria	1.1	Spelling	EN	Is it M-A-N-N or N-A-N-N? Spell the whole name.
1.1-05	Atomic Criteria	1.1	Spelling	ES	¿Es M-A-N-N o N-A-N-N? Deletréelo completo.
1.1-05	Atomic Criteria	1.1	Spelling	FR	C'est M-A-N-N ou N-A-N-N ? Épelez le nom entier.
1.1-05	Atomic Criteria	1.1	Spelling	PT	É M-A-N-N ou N-A-N-N? Soletre tudo, por favor.
1.1-06	Atomic Criteria	1.1	Spelling	DE	Die Marke schreibt sich R-O-S-E-N-T-H-A-L, in Großbuchstaben.
1.1-06	Atomic Criteria	1.1	Spelling	EN	The brand is spelled S-C-H-W-A-R-Z-K-O-P-F, all caps.
1.1-06	Atomic Criteria	1.1	Spelling	ES	La marca se escribe D-E-S-I-G-U-A-L, en mayúsculas.
1.1-06	Atomic Criteria	1.1	Spelling	FR	La marque s'écrit L-O-N-G-C-H-A-M-P, en majuscules.
1.1-06	Atomic Criteria	1.1	Spelling	PT	A marca escreve-se P-A-R-F-O-I-S, em maiúsculas.
1.1-07	Atomic Criteria	1.1	Spelling	DE	Ist es V, E, I, T oder W, E, I, T?
1.1-07	Atomic Criteria	1.1	Spelling	EN	Is the surname S, E, A, L or Z, E, A, L?
1.1-07	Atomic Criteria	1.1	Spelling	ES	¿Es B, A, C, A o V, A, C, A?
1.1-07	Atomic Criteria	1.1	Spelling	FR	C'est C, E, N, T ou S, E, N, T ?
1.1-07	Atomic Criteria	1.1	Spelling	PT	É B, A, S, E ou V, A, S, E?
1.1-08	Atomic Criteria	1.1	Spelling	DE	Mein Kürzel ist kleingeschrieben: w-a-l-d-e-n-b-u-r-g.
1.1-08	Atomic Criteria	1.1	Spelling	EN	My handle is all lowercase: c-a-l-d-e-r-w-o-o-d.
1.1-08	Atomic Criteria	1.1	Spelling	ES	Mi usuario va en minúsculas: c-a-s-t-e-l-l-a-n-o-s.
1.1-08	Atomic Criteria	1.1	Spelling	FR	Mon identifiant est en minuscules : b-e-a-u-r-e-g-a-r-d.
1.1-08	Atomic Criteria	1.1	Spelling	PT	O meu utilizador é em minúsculas: g-o-n-c-a-l-v-e-s.
1.1-09	Atomic Criteria	1.1	Spelling	DE	Der Name schreibt sich mit Punkten: H.O.L.Z.M.A.N.N.
1.1-09	Atomic Criteria	1.1	Spelling	EN	The surname is spelled O.S.U.L.L.I.V.A.N.
1.1-09	Atomic Criteria	1.1	Spelling	ES	El nombre se escribe con puntos: V.I.L.L.A.N.U.E.V.A.
1.1-09	Atomic Criteria	1.1	Spelling	FR	Le nom s'écrit avec des points : D.E.L.A.C.R.O.I.X.
1.1-09	Atomic Criteria	1.1	Spelling	PT	O nome escreve-se com pontos: F.I.G.U.E.I.R.E.D.O.
1.1-10	Atomic Criteria	1.1	Spelling	DE	Die Straße schreibt sich K U R F Ü R S T E N D A M M.
1.1-10	Atomic Criteria	1.1	Spelling	EN	The street is spelled M A R Y L E B O N E.
1.1-10	Atomic Criteria	1.1	Spelling	ES	La calle se escribe F U E N C A R R A L.
1.1-10	Atomic Criteria	1.1	Spelling	FR	La rue s'écrit M O N T P A R N A S S E.
1.1-10	Atomic Criteria	1.1	Spelling	PT	A rua escreve-se A L J U B A R R O T A.
1.2-01	Atomic Criteria	1.2	Acronyms	DE	Die NATO teilte die klassifizierten Daten mit UNESCO-Verbündeten, aber das Kommunikationsteam von BMW musste noch ein Statement für den CEO erstellen, bevor irgendeine Pressemitteilung an das ZDF oder die DB rausging.
1.2-01	Atomic Criteria	1.2	Acronyms	EN	The FBI shared the classified intelligence with NATO partners last Thursday, but NASA's communications office still needed to draft an official statement for the CEO before the press release went live.
1.2-01	Atomic Criteria	1.2	Acronyms	ES	La OTAN compartió los datos clasificados con los aliados de la ONU, pero el equipo de comunicación del BBVA aún tuvo que redactar un comunicado para el CEO antes de cualquier nota de prensa oficial sobre el incidente diplomático.
1.2-01	Atomic Criteria	1.2	Acronyms	FR	L'OTAN a partagé les données classifiées avec l'ONU, mais l'équipe communication de la SNCF devait encore rédiger un communiqué officiel pour le PDG avant toute sortie presse prévue ce vendredi matin.
1.2-01	Atomic Criteria	1.2	Acronyms	PT	A OTAN reuniu-se em Bruxelas para discutir a posição da ONU sobre o conflito, enquanto o IBGE divulgava novos dados demográficos e o CEO da empresa portuguesa apresentava ao INSS uma proposta para integrar serviços digitais com o IPTU municipal.
1.2-02	Atomic Criteria	1.2	Acronyms	DE	Der UNICEF-Bericht zeigt, dass das FBI gemeinsam mit der OPEC und IBM neue Sicherheitsstandards entwickelt hat, während die GEZ ihre Datenbank überarbeitete und URL-Adressen sowie HTML-Strukturen vollständig modernisierte.
1.2-02	Atomic Criteria	1.2	Acronyms	EN	Please contact our HR department to update your direct deposit information, then log into the IRS portal using your employer's EIN before the CEO signs off on the quarterly compliance report this Friday afternoon.
1.2-02	Atomic Criteria	1.2	Acronyms	ES	El equipo de IBM trabajó con la UNESCO en un proyecto educativo, mientras que UNICEF coordinaba la distribución de vacunas y el FBI investigaba un fraude relacionado con servidores SQL en varios países latinoamericanos.
1.2-02	Atomic Criteria	1.2	Acronyms	FR	Le rapport de l'UNESCO mentionne que la RATP a financé une étude conjointe avec le CNRS sur la pollution sonore dans les couloirs souterrains des stations parisiennes les plus fréquentées.
1.2-02	Atomic Criteria	1.2	Acronyms	PT	Será que a UNESCO vai aprovar o pedido apresentado pela equipa lusófona, depois de a UNICEF ter alertado para a urgência da intervenção e de o departamento jurídico ter pedido o CPF do representante brasileiro e o CNPJ da organização parceira?
1.2-03	Atomic Criteria	1.2	Acronyms	DE	Bevor Sie die PDF-Datei an den CEO weiterleiten, prüfen Sie bitte, ob die SQL-Abfrage korrekt funktioniert und ob das beigefügte GIF im richtigen Format vorliegt, denn die UNESCO-Konferenz beginnt morgen pünktlich.
1.2-03	Atomic Criteria	1.2	Acronyms	EN	The BBC reported that UNICEF launched a new campaign in coordination with NATO peacekeepers, while the CIA monitored regional developments and the FBI traced suspicious wire transfers connected to several offshore accounts.
1.2-03	Atomic Criteria	1.2	Acronyms	ES	Para registrarse en el portal del DNI electrónico, el ciudadano debe acceder a la URL oficial, completar el formulario HTML y aceptar los términos antes de que la PYME pueda emitir cualquier factura digital correspondiente.
1.2-03	Atomic Criteria	1.2	Acronyms	FR	Après son test ADN, le patient a contacté la CAF pour mettre à jour son dossier, puis EDF lui a envoyé une nouvelle facture incluant les pénalités de retard accumulées depuis janvier dernier.
1.2-03	Atomic Criteria	1.2	Acronyms	PT	Durante a formação técnica em Lisboa, o formador explicou que conhecer HTML não chega para construir aplicações modernas, sendo preciso dominar consultas em SQL, otimizar URLs amigáveis e compreender como a OTAN protege as suas comunicações digitais sensíveis.
1.2-04	Atomic Criteria	1.2	Acronyms	DE	Am Hauptbahnhof München verteilte die DB neue Informationsbroschüren der NATO, während ein BMW-Mitarbeiter dem ZDF erklärte, wie die OPEC-Beschlüsse die deutsche Automobilindustrie und ihre URL-basierten Lieferketten beeinflussen werden.
1.2-04	Atomic Criteria	1.2	Acronyms	EN	Before submitting the form, verify your PIN at the ATM, confirm the URL in your browser address bar, and make sure the HTML rendering matches what your CEO approved during yesterday's product review meeting.
1.2-04	Atomic Criteria	1.2	Acronyms	ES	Un OVNI fue avistado cerca de la base de la OTAN, según informó la ONU en su comunicado oficial, aunque el FBI desmintió rápidamente la noticia y solicitó a los medios verificar las fuentes antes de publicar.
1.2-04	Atomic Criteria	1.2	Acronyms	FR	Le développeur a optimisé une requête SQL complexe pendant que son collègue convertissait un GIF animé en JPEG haute résolution pour le site institutionnel de l'OTAN à Bruxelles.
1.2-04	Atomic Criteria	1.2	Acronyms	PT	O comunicado do hospital esclareceu que os doentes com AIDS terão acesso prioritário ao novo programa terapêutico, e os utentes deverão apresentar o RG, o CPF e o comprovativo de morada para que a UNICEF possa validar o registo internacional.
1.2-05	Atomic Criteria	1.2	Acronyms	DE	Der Bundesgesundheitsminister bestätigte, dass UNICEF zusammen mit der UNESCO eine neue PDF-Dokumentation veröffentlicht hat, in der das FBI und der CEO von IBM gemeinsame Strategien gegen Cyberkriminalität ausführlich beschreiben.
1.2-05	Atomic Criteria	1.2	Acronyms	EN	Our SCUBA instructor explained that NASA originally tested similar breathing apparatus designs, while the FBI investigated counterfeit gear, prompting UNICEF to coordinate safer training programs for coastal communities across the region.
1.2-05	Atomic Criteria	1.2	Acronyms	ES	El especialista en SIDA presentó su investigación ante la UNESCO y UNICEF, destacando la colaboración del CEO de IBM y los equipos del BBVA en la financiación del programa global de salud pública.
1.2-05	Atomic Criteria	1.2	Acronyms	FR	Pendant les JO de Paris, la SNCF a renforcé ses lignes pendant que la RATP coordonnait avec l'UNESCO la protection des sites historiques classés patrimoine mondial situés sur le trajet officiel.
1.2-05	Atomic Criteria	1.2	Acronyms	PT	Será que o CEO da multinacional vai responder à carta da ONU sobre direitos humanos, ou pedirá ao departamento jurídico que reveja primeiro os pareceres da UNESCO antes de qualquer comunicado oficial à imprensa europeia e norte-americana?
1.2-06	Atomic Criteria	1.2	Acronyms	DE	Geben Sie bitte Ihre PIN ein, danach erhöht sich automatisch der RAM des Systems, sodass die SQL-Datenbank schneller arbeitet und die HTML-Seite ohne Verzögerung lädt, wie es die NATO-Sicherheitsrichtlinien ausdrücklich vorschreiben.
1.2-06	Atomic Criteria	1.2	Acronyms	EN	The engineer optimized the SQL query, compressed the JPEG attachments, and exported a small GIF for the marketing slide deck before emailing the URL to the CEO and copying our HR liaison on the message.
1.2-06	Atomic Criteria	1.2	Acronyms	ES	Para optimizar la consulta SQL, el desarrollador exportó los datos a un archivo JPEG ilustrativo, generó un GIF animado para la presentación y compartió la URL con el CEO mediante un correo cifrado urgente.
1.2-06	Atomic Criteria	1.2	Acronyms	FR	Le PDG d'EDF a rencontré le directeur du CNRS pour discuter d'un partenariat sur la fusion nucléaire, avec l'appui financier de l'ONU et la supervision technique de l'UNESCO.
1.2-06	Atomic Criteria	1.2	Acronyms	PT	A reportagem mostrou imagens de um suposto OVNI sobre o Algarve, e a OTAN confirmou que estava a investigar o caso em colaboração com peritos da ONU, embora o IBGE não tivesse qualquer envolvimento no levantamento técnico apresentado.
1.2-07	Atomic Criteria	1.2	Acronyms	DE	Das ZDF berichtete gestern Abend ausführlich über die OPEC-Sitzung, während BMW und IBM eine neue Partnerschaft ankündigten, die laut CEO eine Revolution für SQL-Datenbanken und JPEG-Bildverarbeitung darstellen soll.
1.2-07	Atomic Criteria	1.2	Acronyms	EN	After the IRS audit concluded, the CEO instructed HR to retrain staff, and the FBI requested additional records, prompting NATO observers and UNICEF representatives to issue a joint statement to the BBC newsroom.
1.2-07	Atomic Criteria	1.2	Acronyms	ES	La PYME contratada por el BBVA desarrolló una plataforma HTML responsive que cumple con los estándares de la UNESCO, integrando consultas SQL seguras y validación de DNI para los usuarios registrados desde cualquier región.
1.2-07	Atomic Criteria	1.2	Acronyms	FR	Un OVNI a été signalé près d'une base de l'OTAN, et l'ONU a demandé un rapport officiel pendant que les chercheurs du CNRS analysaient discrètement les images dans leur laboratoire sécurisé.
1.2-07	Atomic Criteria	1.2	Acronyms	PT	Para concluir o registo no portal das finanças, o utilizador deve introduzir o número de contribuinte, anexar o RG digitalizado, indicar o CNPJ da entidade empregadora e confirmar a morada associada ao IPTU pago no último trimestre de 2025.
1.2-08	Atomic Criteria	1.2	Acronyms	DE	Die GEZ erhöhte den Beitrag, weshalb das ZDF nun zusätzliche Mittel für UNESCO-Projekte bereitstellen kann, während UNICEF gleichzeitig eine HTML-basierte Spendenplattform entwickelt, die das FBI als sicher zertifiziert hat.
1.2-08	Atomic Criteria	1.2	Acronyms	EN	Your laptop needs at least sixteen gigabytes of RAM to run the simulation, and you'll also need a valid VPN, an active CIA clearance code, and the URL provided by NASA's outreach coordinator earlier today.
1.2-08	Atomic Criteria	1.2	Acronyms	ES	El portavoz de la ONU confirmó que UNICEF y la UNESCO firmarán un acuerdo con IBM para implementar inteligencia artificial, mientras el FBI continúa rastreando filtraciones de datos en archivos JPEG y URL sospechosas.
1.2-08	Atomic Criteria	1.2	Acronyms	FR	La campagne de prévention contre le SIDA, soutenue par l'ONU et l'UNESCO, sera diffusée prochainement dans toutes les gares de la SNCF et stations de la RATP du territoire national.
1.2-08	Atomic Criteria	1.2	Acronyms	PT	O programador explicou ao cliente que o ficheiro GIF tinha ficado corrompido durante o envio, mas o JPEG da campanha estava intacto e poderia ser publicado no site, juntamente com a nova URL gerada pelo sistema de gestão de conteúdos.
1.2-09	Atomic Criteria	1.2	Acronyms	DE	Bitte achten Sie darauf, dass die URL korrekt eingegeben wird, bevor Sie das PDF herunterladen, denn die NATO-Server akzeptieren nur sichere Verbindungen, die durch eine spezielle PIN und ausreichend RAM geschützt sind.
1.2-09	Atomic Criteria	1.2	Acronyms	EN	The BBC documentary highlighted how UNICEF, NATO, and the FBI collaborated on a humanitarian initiative, while NASA scientists provided satellite imagery and the CEO of the partnered firm hosted a media briefing in Geneva.
1.2-09	Atomic Criteria	1.2	Acronyms	ES	¿Sabías que la OTAN, la ONU y la UNESCO coordinan acciones humanitarias mientras el CEO del BBVA negocia con IBM la implementación de un sistema HTML accesible para personas con discapacidad visual en zonas rurales?
1.2-09	Atomic Criteria	1.2	Acronyms	FR	La CAF a transmis le dossier au PDG, puis EDF a confirmé que le client avait bien réglé sa facture avant l'envoi du rapport ADN demandé par les avocats spécialisés en droit familial.
1.2-09	Atomic Criteria	1.2	Acronyms	PT	Será que a JBS conseguirá cumprir as exigências da UNESCO em matéria ambiental, ou terá de renegociar contratos com fornecedores europeus, ajustar processos com base em recomendações da ONU e apresentar um relatório detalhado ao CEO antes do final do exercício?
1.2-10	Atomic Criteria	1.2	Acronyms	DE	Der CEO von BMW traf sich mit Vertretern der OPEC und der UNESCO im Hauptbahnhof Frankfurt, um über neue Mobilitätskonzepte zu sprechen, während IBM parallel eine SQL-Schnittstelle für die DB vorstellte.
1.2-10	Atomic Criteria	1.2	Acronyms	EN	Customer service representatives reminded callers to never share their PIN, to verify the URL before entering credentials, and to contact HR if a suspicious email referencing the IRS or the CEO appeared in their inbox.
1.2-10	Atomic Criteria	1.2	Acronyms	ES	¡La PYME ganó el contrato! El CEO felicitó al equipo, agradeció a IBM por su colaboración técnica y prometió enviar el DNI corporativo y la URL del nuevo portal HTML a todos los empleados activos.
1.2-10	Atomic Criteria	1.2	Acronyms	FR	Le format JPEG reste plus efficace que le GIF pour les photos des JO, selon les ingénieurs du CNRS qui collaborent depuis trois ans avec les équipes techniques de l'UNESCO sur ce sujet.
1.2-10	Atomic Criteria	1.2	Acronyms	PT	Caro cliente, para validar a sua conta bancária, peça por favor ao seu contabilista o CPF actualizado, o CNPJ da empresa associada, o comprovativo do INSS e a última declaração entregue ao IBGE no âmbito do recenseamento empresarial obrigatório.

End of preview. Expand in Data Studio

TTS Hard Cases — Customer Support

A compact, text-only evaluation set of hard cases for text-to-speech models, focused on the customer support use case. Published by Gradium.

Most TTS benchmarks measure naturalness on ordinary prose, where modern models are already close to saturated. Production voice agents fail somewhere else: on the literal payload of a support call — the order number, the email address, the spelled-out surname, the date, the amount refunded. A voice that sounds perfect but reads #ORD-4471-XB as "ord four thousand four hundred seventy-one xb" has failed the call.

This dataset isolates exactly those failure modes, in five languages.

At a glance


Rows	500
Unique items	100
Languages	EN, FR, ES, PT, DE
Criteria	10, grouped in 2 categories
Structure	10 criteria × 10 items × 5 languages
Modality	Text only — no reference audio
Split	`test` (evaluation-only, no training split)
License	CC BY 4.0

Dataset structure

One row per (item, language). Fields:

Field	Type	Description
`item_id`	string	Item identifier, formatted `<criterion>-<index>` (e.g. `1.4-07`). Shared across the 5 languages.
`category`	string	`Atomic Criteria` or `Composite Criteria`.
`criterion`	string	Criterion number (`1.1` … `2.3`).
`criterion_name`	string	Human-readable criterion name (e.g. `Date`).
`language`	string	`EN`, `FR`, `ES`, `PT`, `DE`.
`sentence`	string	The text to synthesize.

Example row:

item_id,category,criterion,criterion_name,language,sentence
1.7-01,Atomic Criteria,1.7,Email,EN,For questions about your order, contact our support team at help@gmail.com for a reply within a day.

Parallel, not translated

Each item_id poses the same challenge in all five languages, but the content is localized, not translated. The spelling item uses H-I-G-G-I-N-B-O-T-H-A-M in English and S-C-H-W-E-I-N-S-T-E-I-G-E-R in German; the date item uses locale-plausible date formats. This keeps difficulty comparable across languages while avoiding translationese and entity names that a native speaker would never encounter in that language.

The taxonomy

1. Atomic criteria (350 rows)

Short-to-medium utterances that each stress a single verbalization behaviour.

#	Criterion	Items	What it probes	English example
1.1	Spelling	10	Letter-by-letter readout, hyphen- and comma-separated, initials with periods	The town is spelled L, O, U, G, H, B, O, R, O, U, G, H.
1.2	Acronyms	10	Letter-name vs. word pronunciation (`FBI` vs. `NATO`), embedded in long sentences	The FBI shared the classified intelligence with NATO partners last Thursday…
1.3	Alphanumerical Tokens	10	Mixed letter/digit tokens: `USB-C`, `Wi-Fi 6`, `GPT-4`, `B2B`, `24/7`, `H2O`, `ISO-9`	Our B2B platform now runs smoothly on iOS 17, Android 14, and USB-C connectors…
1.4	Date	10	Ambiguous and mixed formats in one utterance: `04/03/2025`, `03-24-25`, `18.06.2025`, `4 Mar '25`, decades (`the 1990s`)	Your cleaning set for 04/03/2025 is moved to Monday, March 17th, and X-rays are on 03-24-25 downtown.
1.5	Regular Numbers	10	Reading mode by context: years, street numbers, room numbers, flight numbers, times, quantities — often several in one sentence	Flight 812 from terminal 4 boards at gate 27, leaving 6:45 PM…
1.6	Floating and Large Numbers	10	Decimals, thousands separators, magnitudes, units, percentages, currency	Your balance is 12,485.67 dollars, and a pending transfer of 2,750.99 processes tomorrow…
1.7	Email	10	Addresses with dots, underscores, digits, and common domains	…send a report to first_last@hotmail.com with screenshots.

2. Composite criteria (150 rows)

Realistic support-agent turns that combine several atomic difficulties in a single utterance, with conversational prosody on top: greetings, empathy, reassurance, questions.

#	Criterion	Items	Scenario	English example
2.1	Orders	10	E-commerce: order and SKU references, addresses and postcodes, prices, card digits, emails	I've got your order #ORD-4471-XB right here — that's the navy wool coat, SKU WC-228-NV, shipping to 12 Victoria Street, London SW1A 2AA…
2.2	IT Ticket	10	Telecom/IT support: account and ticket IDs, serials, IP and MAC addresses, plan codes, appointment windows	Account ACC-44192-TM, I can see your modem, serial SN-882-44719, is offline since 2:14 PM… Can you confirm the IP shows 192.168.1.1 on your end?
2.3	Claims	10	Insurance and healthcare: policy, claim, member and patient IDs, ICD codes, NPI numbers, phone numbers — delivered in emotionally loaded context	I have your policy POL-55821-HM open right now, and I'm filing claim CLM-90217-AC for the accident on April 18th…

Length grows with difficulty: atomic spelling items run 5–19 words, composite items reach 73 words.

Usage

from datasets import load_dataset

ds = load_dataset("gradium/tts-eval-customer-support-202608", split="test")

# English composite items only
hard = ds.filter(lambda r: r["language"] == "EN" and r["category"] == "Composite Criteria")
for row in hard:
    audio = my_tts_model(row["sentence"], language=row["language"])
    save(f"{row['item_id']}_{row['language']}.wav", audio)

Or straight from the CSV:

import pandas as pd
df = pd.read_csv("data.csv")
df.groupby(["category", "criterion_name"]).size()

Suggested evaluation protocol

The dataset ships text only: there is no reference audio, and there is deliberately no single "correct" phonetic transcription — acceptable verbalizations vary by voice, locale and register. Two protocols work well:

Human scoring (recommended). Synthesize each item, then have a native speaker score the critical tokens — the identifier, the date, the address — as correct / incorrect / ambiguous. Report accuracy per criterion and per language rather than a single aggregate; the interesting signal is which criterion a model breaks on.
ASR-based proxy. Transcribe the synthesized audio with a strong ASR model and compare against a normalized expansion of the source text. Cheap and repeatable, but it inherits the ASR's own biases on exactly these token types, so treat disagreements as items to review by hand.

Because pass/fail here is close to binary per item, per-criterion accuracy over 10 items is coarse — use it to locate failure modes, not to rank two close models.

Limitations and scope

Small by design. 100 items is a diagnostic probe, not a statistical benchmark. Confidence intervals on a 10-item criterion are wide.
No audio, no ground-truth phonemization. Scoring requires a human or an ASR model in the loop.
Five European languages, No tonal languages, no non-Latin scripts, no code-switching items.
Synthetic scenarios. Items are written to be realistic support turns, not sampled from real call transcripts. Names, addresses, order numbers, emails, policy and patient identifiers are all invented; any resemblance to real records is coincidental. Email domains are real providers but the local parts are placeholders.
Written register. Items are clean, well-punctuated text. They do not cover disfluent or LLM-generated input with markdown, emoji, or broken casing — a separate failure mode for production voice agents.

License

Released under CC BY 4.0. You may use, share and adapt the dataset, including commercially, with attribution.

Citation

@misc{gradium2026ttshardcases,
  title  = {TTS Hard Cases — Customer Support},
  author = {Gradium},
  year   = {2026},
  url    = {https://gradium.ai},
  note   = {A multilingual diagnostic set of hard text-to-speech cases for customer support}
}

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