base64
An encoding scheme that converts binary data into ASCII text strings. It is commonly used to transmit binary content such as images over HTTP/JSON interfaces, at the cost of roughly 33 percent size inflation.
Timeline (last 90 days)
base64 encoding inflates data size by about 33%, and inlining large images significantly increases request payload; in practice it is often combined with compression or on-demand cropping to balance quality and transmission overhead.
Anthropic、OpenAI、Google的API返回经过加密处理后以base64编码呈现的加密块（extended thinking block），推理链本身用对称加密算法（如AES）加密后再用base64编码
All Facts (2)
base64 encoding inflates data size by about 33%, and inlining large images significantly increases request payload; in practice it is often combined with compression or on-demand cropping to balance quality and transmission overhead.
50%UnverifiedAnthropic、OpenAI、Google的API返回经过加密处理后以base64编码呈现的加密块（extended thinking block），推理链本身用对称加密算法（如AES）加密后再用base64编码
50%