GLM-5.2 vs. Claude Opus 4.8: Full Comparison
a day ago
- #Open Source AI
- #Performance Comparison
- #AI Models
- GLM-5.2 is an open-weights 753B MoE model by Z.ai, released under MIT license. Claude Opus 4.8 is a proprietary model by Anthropic.
- GLM-5.2 is significantly cheaper (up to 5.7x less on output) compared to Claude Opus 4.8, costing $1.40/$4.40 per million tokens for input/output.
- Claude Opus 4.8 leads in most benchmarks, especially for long-horizon software engineering, tool-use tasks, and multi-agent workflows.
- GLM-5.2 excels in reasoning and math, winning benchmarks like AIME 2026 and IMOAnswerBench against Opus.
- Both models support a 1 million token context window, with similar output caps around 130K tokens.
- GLM-5.2 is text-only, while Opus 4.8 supports vision for tasks like reading screenshots or PDFs.
- GLM-5.2 offers advantages for self-hosting, fine-tuning, and air-gapped environments due to its open weights.
- Choose Opus 4.8 for top performance in complex software engineering or vision tasks; choose GLM-5.2 for cost efficiency, open weights, or strong math/reasoning.