Expired85% confidenceFactTime unknown
There is no model version called 'Opus 4.5' in the officially released Anthropic model lineup
1
Sources
85%
Confidence
Medium-term (~90 days)
Relevance
6/1/2026
First Seen
Valid until: 8/30/2026(expired)
Sources
Related Entities
Related Claims
Unverified截至文章撰写时，Anthropic官方并未发布任何名为'Fable 5'的模型77% similarUnverifiedAnthropic has never released a model version called 'Claude Opus 4.8'74% similarUnverifiedAnthropic has not officially disclosed the specific types of bugs that occurred on Claude Opus 4's first day.69% similarUnverifiedAnthropic introduced Fable 5 shortly after releasing Opus 4.8, as part of its fifth-generation model family68% similar
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