Expired50% confidenceFactExact time
The plans generated by Fable 5 during the planning phase are more than twice as long as those of the Opus 4.8 version, but testers considered them inferior to the Opus 4.8 version in terms of structure and readability.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
Valid until: 9/30/2026(expired)
Sources
Related Claims
UnverifiedIn the e-commerce website test, Fable 5 output 588,000 tokens while Opus 4.8 output 4,898,000 tokens, making Fable 5's token usage approximately 12% of Opus 4.8's.68% similarUnverifiedFable 5 dominated Opus 4.8 in nearly every dimension across three highly demanding coding projects65% similarUnverifiedOpus 5在AI Omniscience测试拿了31分，避免瞎编的能力优于Opus 4.863% similarUnverifiedCompared to Opus 4.6, Sonnet 4.6 performs nearly on par on most benchmarks, but with faster inference speed and lower call costs.61% similarUnverifiedTesters recommended continuing to use Opus 4.8 for the vast majority of tasks for better results, and considered Sonnet 5 disappointing.61% similar
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