Mercor(@mercor_ai):Fable 5 is back and we’ve got results for the re-released version on APEX-SWE. While it did not perform as well as its earlier version from June, the model still significantly outperforms Opus 4.8. Fable 5 (June): 65.5% Pass@1 Fable 5 (July): 54.8% Pass@1 Opus 4.8: 45.3% Pass@1 This re-release scored about 10 points below the original Fable 5, however it still beat Opus 4.8 by more than 9 points.

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Mercor@mercor_ai

2026.07.03 16:25

Fable 5 is back and we’ve got results for the re-released version on APEX-SWE. While it did not perform as well as its earlier version from June, the model still significantly outperforms Opus 4.8. Fable 5 (June): 65.5% Pass@1 Fable 5 (July): 54.8% Pass@1 Opus 4.8: 45.3% Pass@1 This re-release scored about 10 points below the original Fable 5, however it still beat Opus 4.8 by more than 9 points.