GLM-5.3-Flash

Sep
17
GLM-5.3-Flash model guide comparing its $0.50-per-million output price with Opus 4.8 at $25, alongside questions about cost per finished task and its 306 GiB FP8 weights.

GLM-5.3-Flash costs up to 50x less than Opus. Your cost per finished task may not.

Given a billion tokens per vulnerability, GLM-5.3-Flash matched Claude Mythos Preview on ExploitBench at roughly 6% of the cost, while one production team found it fine for bounded work and not ready for their hardest tier.
8 min read