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Coreply supports OpenAI’s API directly. You can use GPT-4.1 and GPT-4o model variants for fast, reliable suggestions.
OpenAI’s free tier is very restrictive. You’ll likely need to add credits to your account before Coreply can make API calls successfully. Note that a ChatGPT subscription does not include API credits — these are separate and must be purchased at platform.openai.com.

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Setup

1

Get your API key

Go to platform.openai.com/api-keys and create a new secret key.
2

Enter your credentials in Coreply

Open Coreply’s settings and fill in the following values:
FieldValue
API URLhttps://api.openai.com/v1/
API KeyYour secret key from OpenAI
Model NameSee recommended models below
3

Choose a model

The following models are recommended for use with Coreply:
gpt-4.1-mini
gpt-4.1-nano
gpt-4.1
gpt-4o-mini
gpt-4o

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Model notes

gpt-4.1-mini offers the best cost-to-performance ratio for Coreply. The mini and nano variants are faster and cheaper while still producing high-quality suggestions.
The gpt-5 family are reasoning models. They work with Coreply but add significant latency before each suggestion, making them a poor fit for real-time texting assistance.