⚙ Curated ranking

Cheapest fine-tunable AI models

Fine-tuning lets you customize a model's behavior on your own data — often the highest-leverage way to improve task accuracy without prompt engineering. Ranked by input price ascending; fine-tuning training costs are separate and not factored here.

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#	Model	Provider	Input price (inference)	Lifecycle	Verified
1	Amazon Nova Lite AWS Bedrock · Active	AB AWS Bedrock	$0.06/M input	Active	· 12h ago
2	GPT-4o Mini OpenAI · Active	OP OpenAI	$0.15/M input	Active	· 12h ago
3	GPT-4.1 Mini OpenAI · Active	OP OpenAI	$0.4/M input	Active	· 12h ago
4	Amazon Nova Pro AWS Bedrock · Active	AB AWS Bedrock	$0.8/M input	Active	· 12h ago
5	o4-mini OpenAI · Active	OP OpenAI	$1.1/M input	Active	· 12h ago
6	GPT-4.1 OpenAI · Active	OP OpenAI	$2/M input	Active	· 12h ago
7	GPT-4o OpenAI · Active	OP OpenAI	$2.5/M input	Active	· 12h ago

Methodology

How this ranking is built

Active models that support fine-tuning and have a published inference input price. Ranked from cheapest inference cost upward. Training costs are billed separately by each provider and aren't included here.

Refreshed as we re-verify each model against its provider's official docs. Every value links to the page it came from. Last updated Jun 3, 2026 20:24 UTC.