The claim is strongly supported by the Reuters article 'Exclusive: Anthropic weighs building its own AI chips, sources say | Reuters,' which directly states that Anthropic is exploring designing its own chips and describes the effort as early stage. That matches the user's statement that Reuters reported Anthropic is considering in-house chip development. Secondary search results from DigiTimes and Economic Times also reflect the same Reuters report, providing corroboration. The referenced X link could not be fetched, so it does not add evidentiary value, but it also does not undermine the Reuters reporting.