GPT-3.5 Turbo fine-tuning now available, GPT-4 to follow this fall


Fine-tuning is now available for GPT-3.5 Turbo, with GPT-4 coming this autumn. OpenAI also makes cheaper GPT-3 models available.

OpenAI has announced the release of fine-tuning capabilities for GPT-3.5 Turbo, allowing developers to customize the language model for improved performance in specific use cases. Fine-tuning for the upcoming GPT-4 model will also be enabled later this year, the company announced.

Fine-tuning allows custom data to be fed into GPT-3.5 Turbo to improve capabilities for specific tasks. Use cases for customization include improving steerability, consistency of output formatting, and customization of tone/voice. Fine-tuning can also reduce prompt length by up to 90%, reducing costs. Security mechanisms, such as the Moderation API, are used to filter out unsafe training data and enforce content policies during fine-tuning.

Early tests show that fine-tuned versions can match or exceed the performance of GPT-4 for specialized applications, according to OpenAI.



OpenAI replaces old GPT-3 models with babbage-002 and davinci-002

Fine-tuning costs can be divided by initial training cost and usage cost and are:

  • Training: $0.008 / 1K Tokens
  • Usage input: $0.012 / 1K Tokens
  • Usage output: $0.016 / 1K Tokens

OpenAI also announced that the GPT-3 base models (ada, babbage, curie and davinci) will be shut down on 4 January 2024. As a replacement, the company is also making the babbage-002 and davinci-002 models available today, either as base or fine-tuned models.

These models can be fine-tuned using the new API endpoint /v1/fine_tuning/jobs. These are significantly cheaper models than gpt-3.5-turbo. Full pricing is available on the OpenAIs blog.

As with all of OpenAI’s APIs, “data sent in and out of the fine-tuning API is owned by the customer and is not used by OpenAI, or any other organization, to train other models”, so the company said.

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