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llama.cpp fixes JSON schema enforcement in Ling 3.0
llama.cpp Releaseshigh confidence
Why it matters
- →Fixes critical bug where json_schema constraints were ignored in Ling 3.0 parser
- →Adds eager response-format grammar path with precedence over tools
- →Prevents trailing prose after JSON responses for stricter output control
llama.cpp has released an update to its Ling 3.0 parser to correctly honor json_schema constraints in chat interactions. Previously, the parser built grammars only for tool calls, ignoring input schemas and leaving response formats unconstrained. The new implementation adds an eager response-format grammar path with higher precedence than tools, requiring a think block before JSON when thinking is enabled and disallowing trailing prose. This fix addresses issue #29652 and improves reliability for structured data extraction in local inference pipelines.
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Earlier coverage that leads up to this article, and what followed. Lines connect each piece to the closest one after it, converging here.
How we got here
- 1llama.cpp b9590 Release Fixes JSON Schema Handling
llama.cpp Releases · June 12, 2026 · Same story
- 2llama.cpp adds Ling 3.0 parser support
llama.cpp Releases · September 20, 2026 · Same story
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