v1.4.553
danielmiessler/Fabricv1.4.553Oct 23, 2026by github-actions[bot]
Upgrading?
Release notes summary
This release fixes an Anthropic provider compatibility issue with the --thinking=off option. Previously, Fabric sent thinking.type=disabled to models that reject that setting, causing 400 errors. The fix uses supported fallback thinking configurations for affected models.
Key Highlights
- Fixed Anthropic provider 400 errors when using --thinking=off with models that reject thinking.type=disabled.
- Affected models include Opus 5.5, Sonnet 5.5, Fable 5/5.1, and Mythos models.
- Replaced unsupported disabled thinking with thinking.type=between_tools for Sonnet 5.5.
- Added adaptive low-effort thinking fallback for models that cannot disable thinking entirely.
Full Release Notes
## Changes ### PR [#2306](https://github.com/danielmiessler/Fabric/pull/2306) by [pcbeingused333](https://github.com/pcbeingused333): fix(anthropic): don't send thinking.type=disabled to models that reject it - Fixed an Anthropic provider issue where `--thinking=off` sent `thinking.type=disabled` to models that reject it (Opus 5.5, Sonnet 5.5, Fable 5/5.1, and the Mythos models), causing 400 errors. - Replaced the unsupported setting with `thinking.type=between_tools` for Sonnet 5.5 and adaptive thinking at low effort for models that cannot disable thinking entirely.
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