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The results show that the quality gap between open-source coding models and a leading frontier model has closed to the point where GLM 5.2 and MiniMax M3 match or exceed Claude Sonnet 4.6 on accuracy while costing the same or less per task.
The evaluation shows that Fable 5's marginal quality lead over Opus 4.8 comes at nearly double the per-task cost, making Opus 4.8 the higher-value choice for production agent fleets despite Fable 5 representing a new capability class.