Z.ai has released GLM-5.3, an open-source AI model with significant improvements in code generation (50% better than GLM-5.2) and new cybersecurity capabilities (2x better at vulnerability detection via CyberGym benchmark). The model is now available via API with flexible pricing options, including reduced rates outside peak hours (14:00-18:00 UTC+8, Mon-Fri). This positions GLM-5.3 competitively against OpenAI and Anthropic models for tech-focused development teams and SMEs building AI-powered tools.