Unverified50% confidenceFactExact time
Anthropic typically names model series codes using literary genre vocabulary (such as Sonnet, Haiku, and Opus); there are no official versions named after mathematicians or fables.
1
Sources
50%
Confidence
Long-term
Relevance
9/19/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedAnthropic's Claude model naming scheme follows the Claude 1/2/3/3.5/4 series with sub-model designations of Haiku, Sonnet, and Opus, and has never featured a 'Fable' designation.72% similarUnverifiedClaude's model line follows a poetic genre naming convention of 'Haiku/Sonnet/Opus' and has never used 'Fable' as a model name.65% similarVerifiedAnthropic's Claude models use a tiered naming system: Opus (most powerful), Sonnet (balanced), and Haiku (lightweight and fast)62% similarUnverifiedAnthropic's Claude series adopts a tiered naming structure of Fable > Opus > Sonnet > Haiku.62% similar
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