iFlytek's Spark X2.6 Adds 1M-Token Context, Open-Sources 4B On-Device Model

On October 22, 2026, iFlytek unveiled its cloud-device integrated Spark X2.6 large model at the main forum of the 2026 Global 1024 Developer Festival, alongside a 4B on-device model, Spark X2.6-4B. A central piece of the announcement was the cloud-device architecture: the system routes each user task to pure on-device execution, pure cloud execution, or a collaborative mode combining both. An architecture diagram shown on stage indicated that the collaborative mode covers two patterns, one in which the cloud guides on-device execution and one in which the two sides split the work, with both leading to task delivery.

During the live demo, the on-device model handled tasks such as email summarization and redaction of sensitive contract information locally, after which the cloud model reviewed and revised the output. In the contract demo interface, the system identified and labeled sensitive fields including company name, legal representative and authorized representative, dates, bank account number, bank branch and commercial amount, counted the categories and their quantities, and replaced some of the sensitive fields. The report noted that real-world recognition accuracy, completeness of redaction and the scope of data transmission would still depend on the specific deployment and usage.

Chairman Liu Qingfeng said the company expects that roughly 60% of future application scenarios can be completed on-device, 30% through cloud-device collaboration, and 10% requiring the cloud model. iFlytek also said the share of tasks the on-device model can complete independently has risen from 12.8% to more than 40%, without disclosing how that figure was measured. The available material stops at this launch and demo; further details of the model's capabilities were not covered.