Qwable-v1 distills Claude Fable-5 agentic traces onto open-weights Qwen3
u/Anony6666 released Qwable-v1, an open-weights model distilled from 4,659 agentic-coding traces of Claude Fable-5 — Anthropic's briefly-public Mythos-class model — onto a Qwen3.6-35B-A3B base.
Score breakdown
Qwable-v1 preserves and openly redistributes Fable-5's agentic-coding behavior and tool-calling surface — including Claude-flavored tools like `str_replace_editor` — despite the anti-distillation classifier and subsequent global suspension of the source model.
- 01Qwable-v1 is distilled from Claude Fable-5, Anthropic's Mythos-class preview model, onto a Qwen3.6-35B-A3B base.
- 02Fable-5 was publicly accessible for ~4 days (2026-06-09 to 2026-06-12) before being suspended under U.S. export-control directives.
- 03Fable-5 scored 80.3% on SWE-bench Pro and was priced at $50/M output tokens.
u/Anony6666 released Qwable-v1, an open-weights model distilled from Claude Fable-5, Anthropic's Mythos-class preview model that was publicly accessible for approximately four days (2026-06-09 to 2026-06-12) before being suspended globally under U.S. export-control directives. At the time of its release, Fable-5 was Anthropic's most powerful model, achieving 80.3% on SWE-bench Pro and priced at $50/M output tokens. The API included an anti-distillation classifier that redacted thinking blocks on the fly, making direct knowledge extraction difficult.
The distillation leveraged 4,659 cleartext agentic-coding traces sourced from `Glint-Research/Fable-5-traces`, described as the only public corpus where Fable-5's chain-of-thought made it through intact.
The distillation leveraged 4,659 cleartext agentic-coding traces sourced from `Glint-Research/Fable-5-traces`, described as the only public corpus where Fable-5's chain-of-thought made it through intact. These traces were used to fine-tune a Qwen3.6-35B-A3B base model over approximately 14 hours on a single H200 GPU. The resulting model, Qwable-v1, not only mimics Fable-5's style but also reproduces its tool-calling surface — given an agent system prompt, it emits properly-formatted XML calls to Claude-flavored tools such as `str_replace_editor`, indicating that Fable's tool interface leaked into the weights.
The model, multiple GGUF quantizations (`IQ4_XS`, `Q4_K_M`, `Q5_K_M`, `Q8_0`), and the SFT dataset are all publicly available on Hugging Face under the AGPL-3.0 license inherited from the upstream Qwen3.6 base.
Key facts
- 01Qwable-v1 is distilled from Claude Fable-5, Anthropic's Mythos-class preview model, onto a Qwen3.6-35B-A3B base.
- 02Fable-5 was publicly accessible for ~4 days (2026-06-09 to 2026-06-12) before being suspended under U.S. export-control directives.
- 03Fable-5 scored 80.3% on SWE-bench Pro and was priced at $50/M output tokens.
- 04Fable-5's API included an anti-distillation classifier that redacted thinking blocks on the fly.
- 05The distillation used 4,659 cleartext agentic-coding traces from `Glint-Research/Fable-5-traces`, the only public corpus where the chain-of-thought survived.
- 06Fine-tuning ran for approximately 14 hours on a single H200 GPU.
- 07The model, GGUF quantizations (IQ4_XS / Q4_K_M / Q5_K_M / Q8_0), and SFT dataset are all public on Hugging Face under AGPL-3.0.
Topics
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