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Documentation Index

Fetch the complete documentation index at: https://heygen-1fa696a7.mintlify.app/llms.txt

Use this file to discover all available pages before exploring further.

HeyGen API v3

The actively developed API. All new endpoints, models, and capabilities — including Avatar IV and Video Agent — are v3-first.

HeyGen API v1 and v2 (Legacy)

Fully maintained, but no longer receiving new feature investment.

Deprecation Timeline — Oct 31, 2026
The v1 and v2 endpoints will remain fully supported until October 31, 2026. Our engineering roadmap and new feature development are focused exclusively on v3. The primary distinction between the legacy endpoints and v3 lies in the Studio API and Template API, which are available in v2 but not yet supported in v3. Apart from these, the v3 endpoints cover the full HeyGen API, providing a unified platform for all new development. We recommend migrating all new and existing integrations to v3. Read more here.

For questions about migration or enterprise support, please reach out to HeyGen support.