Ornith-1.0 coding model impresses on benchmarks but hits Ollama compatibility walls

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Ornith-1.0 is an open-weight 9-billion-parameter coding model released in June 2026, notable for training the model to generate and refine its own task plans rather than relying on externally built scaffolding. Despite benchmark results suggesting it matches or outperforms models four times its size, a developer found it could not be reliably used as a local Claude Code backend. Two key bugs emerged during setup: a missing chat-template in the raw GGUF caused looping output, and Claude Code's extended-thinking requests were rejected by Ollama since the capability was never declared. Both issues were patched with manual Modelfile edits and an environment variable, but tool-call parsing remained broken because Ollama lacks native support for the XML-format tool calls Ornith generates.

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