Unverified50% confidenceReleaseExact time
Anthropic's Claude upgrades, with Fable 5.1 and MyFast 5.1 launching simultaneously
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
9/8/2026
First Seen
Valid until: 12/7/2026
Sources
Related Entities
Related Claims
VerifiedAnthropic officially released the first model in the Claude 5 series, named Claude Fable 5.70% similarUnverifiedAnthropic released Claude 5.1, along with a Claude Opus-level security version for trusted professional users.69% similarUnverifiedThe default model of Claude Code 2.1 has been upgraded to Opus 4.6.63% similarUnverifiedAnthropic introduced Fable 5 shortly after releasing Opus 4.8, as part of its fifth-generation model family63% similarUnverifiedAnthropic has launched Claude Sonnet 5, whose overall performance closely approaches that of the flagship Opus 4.8.62% similar
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