CCLS_to_akmaxsat is a combination of the stochastic local search solver CCLS and the complete solver akmaxsat. The procedures of CCLS_to_akmaxsat are described as follows. 1. CCLS_to_akmaxsat first utilizes CCLS to find an upper bound and the corresponding assignment. 2. CCLS_to_akmaxsat then passes the upper bound and the corresponding assignment to akmaxsat, and finally calls akmaxsat to solve the instance. Authors: Chuan Luo [1], Shaowei Cai [2], Kaile Su [3], Wei Wu [4], Zhong Jie [5] Institutes: [1] Key laboratory of High Confidence Software Technologies, Peking University, Beijing, China [2] State Key Laboratory of Computer Science, Institute of Software, Chinese Academy of Sciences, Beijing, China [3] Institute for Integrated and Intelligent Systems, Griffith University, Brisbane, Australia [4] Center for Quantum Computation and Intelligent Systems, University of Technology, Sydney, Sydney, Australia [5] NetEase, Inc., Hangzhou, China