Anthropic Messages: the accumulated usage of the final message
(message_start.message.usage, updated by message_delta.usage).
input_tokens excludes cache reads and writes, so they are added back to
keep inputTokens comparable with the OpenAI-style total.
Anthropic Messages: the accumulated
usageof the final message (message_start.message.usage, updated bymessage_delta.usage).input_tokensexcludes cache reads and writes, so they are added back to keepinputTokenscomparable with the OpenAI-style total.