Clarifications and expansions on Claude model versions and API topics

This support page primarily explains how Anthropic's usage and length limits function for its Claude models. The recent updates broaden the scope of model references, changing from specific mentions of 'Claude Fable 5' to the more general 'Claude Fable models' and incorporating 'Fable 5.1' into discussions about model switching. This indicates an evolution in the available or referenced models without changing specific numerical limits. Furthermore, the page has expanded its coverage of the Claude API, adding new documentation topics such as 'API troubleshooting', 'API and distillation', and 'Preserved thinking', which details changes to how thinking blocks are handled in the Messages API. The previous entries like 'Using the Claude API and Console' and 'Pricing and Billing' were replaced with slightly rephrased or expanded versions, suggesting content updates rather than removal of the topics. The changes do not specify any new numerical limits, quotas, or pricing adjustments; rather, they update model terminology and provide additional API-related information.