feat: add Claude Fable 5 as a supported model (#1467)

* feat: add Claude Fable 5 as a supported model

Add Anthropic's claude-fable-5 (Mythos-class, released June 9 2026) to
the supported model list so it can be selected in the profile editor.

Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>

* fix: order Fable 5 after Opus 4.8 so stale-Anthropic fallback is preserved

provider_fallback_pair picks the first same-provider model, so placing
Fable 5 first redirected stale Opus selections to it. Keep Opus 4.8 first.

Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>

---------

Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>
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Johannes du Plessis 2026-06-09 10:59:26 -07:00 • committed by GitHub
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@ -21,6 +21,13 @@ SUPPORTED_MODELS: list[ModelOption] = [
"default_effort": "high",
"supports_images": True,
},
{
"id": "anthropic:claude-fable-5",
"label": "Fable 5",
"efforts": ["low", "medium", "high", "xhigh", "max"],
"default_effort": "high",
"supports_images": True,
},
{
"id": "openai:gpt-5.5",
"label": "GPT-5.5",