GLM 5.2 Matches Claude Fable 5 Quality at 73% Lower Cost in Agentic Coding Test

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A developer ran identical agentic coding tasks on Anthropic's Claude Fable 5 and Z.ai's open-weight GLM 5.2, using the same prompt, repository context, and agent setup. Claude Fable 5 completed the task in roughly 9 minutes at a cost of over $10, while GLM 5.2 took about 17 minutes and cost $2.76. Despite being slower, GLM 5.2 produced a project plan and initial code of comparable quality for this particular task. The price difference stems largely from token pricing: Fable 5 charges $50 per million output tokens versus GLM 5.2's $4.40, a gap that compounds heavily in output-intensive agentic workflows. On formal benchmarks such as SWE-bench Pro, Fable 5 scores higher at 80% versus GLM 5.2's 62.1%, suggesting the closed model retains an edge on more complex, long-horizon coding challenges.

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