Claude export does not include model version

What the limitation is
The Claude conversations.json export format does not include which AI model generated each response. The export contains full content, thinking blocks, tool use, and timestamps, but the specific model (e.g. claude-opus-4, claude-sonnet-3-5) is not recorded at the conversation or message level.

How it was discovered
Analysis of the Claude export file (95 conversations, ~29MB) while designing the chat import pipeline. The model field is absent from the schema.

Impact
Imported conversations cannot be automatically tagged or filtered by model. Cannot track how output quality has changed across model versions. The historical record of AI assistance is incomplete — the tool is captured but not which version of the tool.

Workaround
None from the export itself. Feedback submitted to Anthropic requesting model version be included. Date-range inference against known model release windows is possible but imprecise.

Status
No workaround. Feedback submitted to Anthropic.

LOGOS Requirement
See: LOGOS → Requirements — Arbitrary post metadata (model version, import provenance)