Feature

Fine-Tuning & Custom Models

Adapt hosted models to your own data.

11 providers 97 APIs 10 declared variants

Customers can fine-tune, adapt, or train custom models on their data within the platform. Matters when prompt engineering alone cannot hit the required accuracy.

11 API providers on the APIs.io network offer fine-tuning & custom models. The highest-rated are ChatGPT, Mistral AI, Replicate, Leonardo.AI, Deepgram.

Providers

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 3 Complete, well-documented, and agent-ready
ChatGPT OpenAI's ChatGPT API for conversational AI and language model interactions. 2 APIs 75.6 Mistral AI Mistral AI provides state-of-the-art large language models and AI APIs for developers and enterprises. 11 APIs 68.3 Replicate Replicate lets you run machine learning models in the cloud with a simple API. Thousands of open-source mod... 16 APIs 67.8
Strong 2 Solid coverage with minor gaps
Leonardo.AI Leonardo.AI is an Australian generative-AI company (acquired by Canva in July 2024) offering a Production A... 14 APIs 64.0 Deepgram Deepgram is an enterprise voice AI platform that provides speech-to-text, text-to-speech, and voice agent A... 12 APIs 60.3
Developing 3 Usable, with meaningful gaps to close
Amazon Nova Amazon Nova is a new generation of state-of-the-art foundation models from Amazon that deliver a compelling... 3 APIs 51.3 cohere Generates a text response to a user message and streams it down, token by token. 9 APIs 46.1 Docling Docling is an open-source toolkit for parsing diverse document formats — PDF, DOCX, PPTX, XLSX, HTML, image... 18 APIs 44.0
Thin 1 Limited public surface area
Apache OpenNLP Apache OpenNLP is a machine learning based toolkit for the processing of natural language text. It supports... 10 APIs 37.1
Emerging 2 Early or largely undocumented
Cresta Cresta is a Mountain View / Sunnyvale, California contact center AI company spun out of the Stanford AI Lab... 25.5 Refact.ai Refact.ai is an open-source, local-first AI coding assistant and autonomous software-engineering agent buil... 2 APIs 17.4

What Providers Actually Declared

This feature is a canonical term. These are the free-text strings providers wrote in their own apis.yml that map onto it.

Custom Model TrainingCustom Models and Custom Elements — LoRA-style fine-tuning on user-uploaded datasetsCustom model training (Enterprise)Fine-TuningFine-tuning for Command and AyaFine-tuning on customer-proprietary transcripts plus purpose-built synthetic datasetsFine-tuning service for select modelsLLM fine-tuning on company codebase (Refact, StarCoder, DeepSeek-Coder, CodeLlama variants)Synthetic data generation via docling-sdg for fine-tuningTraining service for fine-tuning

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