The independent guide to fine-tuning companies

Managed fine-tuning APIs, training platforms where you bring your own code, hyperscaler tuning services, and firms that train a custom model for you. Filter by method, weights export, buying model, and published certifications, with every fact linked to its source.

Explore the landscape Read the buyer’s guide

14vendors profiled: Managed services, expert networks, platforms, and dataset sellers.
53primary sources: Vendor sites, trust portals, and company releases. No listicles.
0paid placements: Nobody pays to appear or to change their position.

Who covers what

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Published workload coverage for 14 fine-tuning vendors. Click a column to see those vendors.

Which workloads each vendor publicly describes
Vendor	SFT	LoRA / PEFT	Full fine-tuning	Preference / DPO	RL / RFT	Weights download	Your own code	Done for you
Amazon Bedrock (model customization)	Yes	No	No	No	Yes	No	No	No
Baseten Training	Yes	Yes	No	No	Yes	Yes	Yes	No
CoreWeave Serverless Training (incl. OpenPipe)	Yes	Yes	No	No	Yes	No	No	No
Databricks (AI Runtime training)	No	No	No	No	No	No	Yes	No
Fireworks AI	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No
Google Cloud Vertex AI tuning (Agent Platform)	Yes	Yes	Yes	Yes	Yes	No	No	No
Invisible Technologies	Yes	No	No	No	Yes	No	No	Yes
Microsoft Foundry fine-tuning	Yes	No	No	Yes	Yes	No	Yes	No
Modal	Yes	Yes	Yes	No	Yes	No	Yes	No
Nebius Token Factory (post-training)	Yes	Yes	Yes	No	Yes	Yes	No	No
Scale AI (Scale Post-Training)	No	No	No	No	No	No	No	Yes
Tinker (Thinking Machines Lab)	Yes	Yes	No	No	Yes	Yes	Yes	No
Together AI	Yes	Yes	Yes	Yes	Yes	Yes	No	No
Turing	No	No	No	No	Yes	No	No	Yes
Vendors	11	8	5	4	12	5	6	3

Based on each vendor’s published categories and capabilities. A filled dot means the vendor describes this workload publicly; it is not a quality judgment.

Vendor landscape

14 vendors, checked November 8, 2026. Use filters for training method, buying model, published certifications, and public pricing. Select up to four to compare side by side.

Fine-tuning vendors in alphabetical order with buying model, ownership, published certifications, and pricing
Vendor	Buying model	Ownership	SOC 2	ISO 27001	HIPAA	GDPR	Pricing
Amazon Bedrock (model customization)Managed fine-tuning API	Managed fine-tuning API, Hyperscaler cloud platform	Publicly listed	Not found	Not found	Published	Published	Published
Baseten TrainingBring-your-own-code training platform	Bring-your-own-code GPU platform	Privately held	Published	Not found	Published	Not found	On request
CoreWeave Serverless Training (incl. OpenPipe)Managed fine-tuning API	Managed fine-tuning API	Publicly listed	Published	Published	Not found	Not found	On request
Databricks (AI Runtime training)Bring-your-own-code training platform	Bring-your-own-code GPU platform	Privately held	Published	Published	Not found	Not found	On request
Fireworks AIManaged fine-tuning API	Managed fine-tuning API	Privately held	Published	Published	Published	Not found	Published
Google Cloud Vertex AI tuning (Agent Platform)Managed fine-tuning API	Managed fine-tuning API, Hyperscaler cloud platform	Publicly listed	Published	Published	Published	Not found	Published
Invisible TechnologiesManaged fine-tuning service	Managed training service	Privately held	Published	Not found	Published	Published	On request
Microsoft Foundry fine-tuningManaged fine-tuning API	Managed fine-tuning API, Hyperscaler cloud platform	Publicly listed	Not found	Not found	Not found	Not found	Published
ModalBring-your-own-code training platform	Bring-your-own-code GPU platform	Privately held	Published	Not found	Published	Published	Published
Nebius Token Factory (post-training)Managed fine-tuning API	Managed fine-tuning API	Publicly listed	Published	Published	Published	Published	On request
Scale AI (Scale Post-Training)Managed fine-tuning service	Managed training service	Privately held	Published	Published	Not found	Not found	On request
Tinker (Thinking Machines Lab)Training API	Managed fine-tuning API	Privately held	Not found	Not found	Not found	Not found	Published
Together AIManaged fine-tuning API	Managed fine-tuning API	Privately held	Published	Published	Published	Not found	Published
TuringManaged fine-tuning service	Managed training service	Privately held	Not found	Not found	Not found	Not found	On request

Alphabetical. A check means the vendor publishes it on its own site or trust portal; a dash means we found nothing public, so ask the vendor.

Research and comparisons

GuideNov 8, 2026 How to choose an LLM fine-tuning platform or service Seven decisions, in order: whether to fine-tune, method, data, model and weights, buying model, deployment, and security and cost. ComparisonNov 8, 2026 Together AI vs Fireworks AI ComparisonNov 8, 2026 Google Cloud Vertex AI vs Amazon Bedrock for fine-tuning ComparisonNov 8, 2026 Tinker vs CoreWeave Serverless Training

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How this guide works

Every claim links to a public source, with the date we checked it.
No paid rankings. Vendors are listed alphabetically or by the filters you choose.
Pricing quoted exactly where a vendor publishes it. Otherwise: contact vendor.

Read the methodology