Today SparkLLM releases and open-sources two on-device general models: Spark X2.5-4B and Spark X2.5-1.7B . Both natively support a context window of up to 1,000,000 tokens — as far as we know, the only on-device models to do so. Why 1M context on-device In real work, you rarely hand a model a single question — you hand it a whole after-sales manual, a set of meeting materials, a batch of project docs, or an entire code repository. On-device models used to chop long content i...