GLM-5.3-Flash Benchmark vs Gemini, DeepSeek & GPT-5.6

GLM-5.3-Flash is Z.ai’s MIT-licensed, open-weight multimodal Mixture-of-Experts model, released on 26 August 2026 after appearing anonymously as Ox Alpha, with 320B total parameters, 18B active parameters, a roughly 1M-token context window, and text, image, and video inputs. Z.ai reports strong results in tool use, automation, document-oriented vision, and chart reasoning, including leading scores in its comparison set for Toolathlon Verified, GDPval-AA v2, OfficeQA Pro, and Chartography with Tools, while competitors such as Gemini 3.7 Flash lead several coding, automation, natural-image, and video benchmarks. Independent Artificial Analysis places GLM-5.3-Flash at an Intelligence Index of 57, below current frontier models and the larger GLM-5.3, and measures output throughput near 50 tokens per second, suggesting that “Flash” primarily reflects its low-cost positioning rather than latency. At $0.15 per million input tokens and $0.50 per million output tokens, with an 83% prompt-cache discount, it is positioned for high-volume agentic, document-processing, and batch workloads, though DeepSeek V4-Flash is cheaper for output-heavy use cases and faster managed alternatives may be preferable for interactive applications. The report emphasizes that many detailed benchmark results are vendor-reported and should be validated using production-specific evaluations, especially because benchmark versions such as Terminal-Bench 2.1 and 3.0 are not directly comparable.

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