Using Ellmer Chat Models

In hellmer: Batch Processing for Chat Models

knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>"
)

There are two ways to use ellmer chat models for batch processing. This flexibility allows you to 1) pass a chat model object or 2) pass a function. The chat object method is more flexible because the object can be reused.

Method 1: Passing an Object

The first method is to pass a chat model object. This is useful when you want to reuse an existing model configuration:

library(hellmer)

openai <- chat_openai(
  model = "o3-mini",
  system_prompt = "Reply concisely, one sentence"
)

chat <- chat_sequential(openai)

Method 2: Passing a Function

The second method is to pass an ellmer chat model function directly. This method may be preferred if you only need to use a model once or aesthetically prefer not to nest functions. There is not any great reason to use this method, but it's available for backward compatibility.

chat <- chat_sequential(
  chat_openai,
  model = "o3-mini",
  system_prompt = "Reply concisely, one sentence"
)

hellmer documentation built on June 8, 2025, 11:09 a.m.