stream_anthropic: Stream from Anthropic API

In aisdk: Unified Interface for AI Model Providers

Stream from Anthropic API

Description

Makes a streaming POST request to Anthropic and processes their SSE format. Anthropic uses event types like content_block_delta instead of OpenAI's format. Also handles OpenAI-compatible format for proxy servers.

Usage

stream_anthropic(
  url,
  headers,
  body,
  callback,
  max_retries = 5,
  initial_delay_ms = 2000,
  backoff_factor = 2,
  timeout_seconds = NULL,
  total_timeout_seconds = NULL,
  first_byte_timeout_seconds = NULL,
  connect_timeout_seconds = NULL,
  idle_timeout_seconds = NULL
)

Arguments

url	The API endpoint URL.
headers	A named list of HTTP headers.
body	The request body (will be converted to JSON).
callback	A function called for each text delta.
max_retries	Maximum number of connection/first-event retries before any stream chunk has been delivered.
initial_delay_ms	Initial delay in milliseconds.
backoff_factor	Multiplier for delay on each retry.
timeout_seconds	Legacy alias for total_timeout_seconds.
total_timeout_seconds	Optional total stream timeout in seconds.
first_byte_timeout_seconds	Optional time-to-first-byte timeout in seconds.
connect_timeout_seconds	Optional connection-establishment timeout in seconds.
idle_timeout_seconds	Optional stall timeout in seconds.

Value

A GenerateResult object.

aisdk documentation built on May 29, 2026, 9:07 a.m.