ModelTreeAI Model Lineage
What changed

Read the recorded release updates.

7 recorded changes to reviewed releases, newest first. Every entry states what changed in its source's own words, the kind of change it was, the primary source it rests on, and the day we last re-checked it. Entries are ordered by the date the source stated, never by the day we checked them, so re-verifying an old record does not make it look new.

The release timeline answers a different question — when each model first appeared — and covers releases as well as events. This page is the change ledger: only recorded events, each with its evidence. A plain-text changelog is generated from these same records at every build; everything in it was last re-checked on or before .

7 recorded changes

  1. 2026

    6 changes

    1. September 2026

      1. Generally available

        Claude Fable 5.1Anthropic

        Anthropic launched Claude Fable 5.1 and described it as generally available, on the Claude API, Amazon Bedrock, Claude Platform on AWS, Google Cloud and Microsoft Foundry.

        Last checked
        when this record was re-checked, not when the change happened

        Link to this update

      2. API available

        Claude Mythos 5.1Anthropic

        Anthropic launched Claude Mythos 5.1 on the Claude API alongside Claude Fable 5.1, for Project Glasswing participants. Anthropic describes it as available only through its trusted access programs rather than generally available.

        Last checked
        when this record was re-checked, not when the change happened

        Link to this update

    2. August 2026

      1. API available

        Qwen3.8-27BAlibaba Cloud

        Amazon announced Alibaba Cloud’s Qwen3.8-27B as available on Amazon SageMaker JumpStart. This changes where the model can be deployed and changes nothing about who created it.

        Last checked
        when this record was re-checked, not when the change happened

        Link to this update

      2. Generally available

        Qwen3.8-27BAlibaba Cloud

        Alibaba Cloud recorded Qwen3.8-27B as available on Hugging Face Hub and ModelScope.

        Source
        Last checked
        when this record was re-checked, not when the change happened

        Link to this update

      3. Preview

        MAI-Thinking-1Microsoft

        Microsoft AI announced MAI-Thinking-1 as available in public preview on Microsoft Foundry.

        Last checked
        when this record was re-checked, not when the change happened

        Link to this update

      4. Generally available

        Qwen3.8-2.4T-A95BAlibaba Cloud

        Alibaba Cloud recorded Qwen3.8-2.4T-A95B as available on Hugging Face Hub and ModelScope.

        Source
        Last checked
        when this record was re-checked, not when the change happened

        Link to this update

  2. 2025

    1 change

    1. December 2025

      1. Generally available

        Amazon Nova 2 SonicAmazon

        Amazon announced the availability of Nova 2 Sonic in Amazon Bedrock in three AWS Regions.

        Last checked
        when this record was re-checked, not when the change happened

        Link to this update