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AnthropicClaude API

We’ve added a line field to the Models API

AI summary

Written by AI from the official notes. Check them for exact details.

A new line field has been added to the Models API to identify model groups.

  • New line field added to Models API for model grouping.
  • GET /v1/models now includes model line information.
  • Dreams now supports Claude Opus 5.5, Claude Fable 5.1, and Claude Sonnet 5.5.

Why it matters: Developers and users of the Models API should care for easier model organization.

Official notes on platform.claude.com

Full release notes2 changes

  • We’ve added a line field to the Models API. GET /v1/models and GET /v1/models/{model_id} now return the model line each model belongs to. Claude Opus 4.5 and Claude Opus 4.6 both report opus, for example. Use line to group models without parsing their IDs. line is null for a model that belongs to no line. See Using the Models API.
  • Dreams (research preview) now supports Claude Opus 5.5, Claude Fable 5.1, and Claude Sonnet 5.5. See Supported models.