# In a significant move for the open-source AI ecosystem, Zhipu AI (rebranding as Z.ai) has officially released GLM-5, its newest flagship model. This 744-billion parameter Mixture-of-Experts (MoE) beast is designed to compete directly with proprietary giants like Anthropic’s Claude Opus 4.5 and Google’s Gemini 3 Pro. Available now on platforms like OpenRouter (where it was previously spotted in stealth as “Pony Alpha”), GLM-5 represents a massive leap in coding performance and long-horizon agentic capabilities. ### Key Breakthroughs: The “Slime” Framework The standout technical innovation in GLM-5 is the introduction of the “Slime” (Scalable Lightweight Iterative Model Evolution) reinforcement learning framework. Traditionally, Reinforcement Learning (RL) training for large models is bottlenecked by synchronous policy updates—where the entire system must wait for data generation before updating. Slime breaks this cycle by: * Asynchronous Training: Decoupling data generation from policy updates, allowing for up to 3x higher throughput. * Active Partial Rollouts (APRIL): Handling complex, long-running agent tasks by independently generating trajectories. * Reduced Hallucinations: Zhipu claims a record-low hallucination rate, particularly in complex tool-use scenarios. ### Performance Benchmarks GLM-5 has shown exceptional results in several key areas: * Coding: Built success rates in frontend tasks have improved by 26% over its predecessor, GLM-4.7. * Agentic Planning: It excels in benchmarks like τ2-Bench (complex tool planning) and BrowseComp (networked search understanding). * Efficiency: Despite its size, the MoE architecture ensures it remains competitively priced, ranging from $0.80 to $1.00 per million input tokens. ## Why It Matters The release of GLM-5 just before the Lunar New Year signals the intensifying competition in the “frontier” model space. By making such a powerful model open-source, Zhipu AI is positioning itself as the “DeepSeek of 2026,” providing the community with tools that were previously the exclusive domain of Silicon Valley’s closed labs. As OpenAI prepares to retire GPT-4o tomorrow (February 13), the arrival of GLM-5 offers a compelling alternative for developers seeking high-end reasoning and agentic control without the vendor lock-in. — Sources: Reuters, VentureBeat, Z.ai Official Release.