diff --git a/neuralnetworks/1.2/IPreparedModel.hal b/neuralnetworks/1.2/IPreparedModel.hal
index 5d2d80f..757d5f1 100644
--- a/neuralnetworks/1.2/IPreparedModel.hal
+++ b/neuralnetworks/1.2/IPreparedModel.hal
@@ -157,4 +157,62 @@
                             fmq_sync<FmqRequestDatum> requestChannel,
                             fmq_sync<FmqResultDatum> resultChannel)
                  generates (ErrorStatus status, IBurstContext context);
+
+    /*
+     * Saves the prepared model to cache files.
+     *
+     * saveToCache is used to save a prepared model to cache files for faster
+     * model compilation time when the same model preparation is requested in
+     * the future. There are exactly two cache file descriptors provided to the
+     * driver: modelCache and dataCache.
+     *
+     * The dataCache is for caching constant data, possibly including preprocessed
+     * and transformed tensor buffers. Any modification to the dataCache should
+     * have no worse effect than generating bad output values at execution time.
+     *
+     * The modelCache is for caching security-sensitive data such as compiled
+     * executable machine code in the device's native binary format. A modification
+     * to the modelCache may affect the driver's execution behavior, and a malicious
+     * client could make use of this to execute beyond the granted permission. Thus,
+     * the driver must always check whether the modelCache is corrupted before preparing
+     * the model from cache.
+     *
+     * The two file descriptors must point to two zero-length files with offset
+     * positioned at the beginning of the file. The file descriptors may be closed
+     * by the client once the method has returned.
+     *
+     * If the driver decides not to save the prepared model without looking at the
+     * input arguments to the saveToCache function, saveToCache must return with
+     * ErrorStatus::GENERAL_FAILURE. Otherwise, the saveToCache function must verify
+     * the input arguments to the saveToCache function are valid, and return with
+     * ErrorStatus::INVALID_ARGUMENT if not. If the inputs are valid but the driver
+     * could not save the prepared model, saveToCache must return with the appropriate
+     * ErrorStatus. Otherwise, it must write the cache files and return
+     * ErrorStatus::NONE. Unless saveToCache returns ErrorStatus::NONE, the contents
+     * of the cache files are undefined.
+     *
+     * @param modelCache A handle holding exactly one cache file descriptor for the
+     *                   security-sensitive cache.
+     * @param dataCache A handle holding exactly one cache file descriptor for the
+     *                  constants' cache.
+     * @param token A caching token of length Constant::BYTE_SIZE_OF_CACHE_TOKEN
+     *              identifying the prepared model. The same token will be provided
+     *              when retrieving the prepared model from cache files with
+     *              IDevice::prepareModelFromCache. Tokens should be chosen to have
+     *              a low rate of collision for a particular application. The driver
+     *              cannot detect a collision; a collision will result in a failed
+     *              execution or in a successful execution that produces incorrect
+     *              output values.
+     * @return status Error status of saveToCache, must be:
+     *                - NONE if saveToCache is performed successfully
+     *                - DEVICE_UNAVAILABLE if driver is offline or busy
+     *                - GENERAL_FAILURE if the driver could not save the
+     *                  prepared model or if there is an unspecified error
+     *                - INVALID_ARGUMENT if one of the input arguments is invalid,
+     *                  unless the driver decides not to save the prepared model
+     *                  without looking at the input arguments
+     */
+    saveToCache(handle modelCache, handle dataCache,
+                uint8_t[Constant:BYTE_SIZE_OF_CACHE_TOKEN] token)
+        generates (ErrorStatus status);
 };