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title: Does this model need a reasoning parser?
emoji: 🧩
colorFrom: indigo
colorTo: gray
sdk: static
app_file: index.html
pinned: false
license: apache-2.0
short_description: Decide --reasoning-parser from a model's own chat template
Reasoning-parser advisor
A model that thinks needs vLLM's --reasoning-parser to split that
thinking out of the answer, and the two ways of getting it wrong are not
symmetric.
A missing parser is visible: the user sees the model's reasoning in
the reply. A wrong one is not — it claims the entire output, the
request finishes with stop, and content comes back empty.
Nothing errors, and nothing in the logs says so.
The family name cannot decide it. Qwen3.6-35B-A3B emits <think> and
needs the qwen3 parser; Qwen3-VL-30B emits nothing of the sort and
is broken by it. A quantized pack inherits its source's template, so the
same split runs through every repack.
Everything runs in the visitor's browser. There is no backend and nothing is uploaded: the page fetches the repo's chat template — a few kilobytes — and asks whether the assistant's turn carries a marker some parser closes on.
How the rules are kept honest
Markers are read out of vLLM's own vllm/reasoning/ modules rather than
from documentation, because a parser matches what its code matches. Only
markers that discriminate a reasoning section are listed: an earlier
version of the table included <|end|>, gpt-oss's turn terminator, and
recommended a parser for a model that does no thinking at all.
The rules exist twice — once in Python for development, once in JavaScript for this page — and a parity gate runs the same fixtures through both and refuses to deploy on any disagreement.
Built from the tooling behind the aleada W4A16 packs. See also the pack integrity checker.