[guygir]

Overview

Add exact image routing-metadata adapters for
GLM-5.3-Flash (zai-org/GLM-5.3-Flash) and DeepSeek V4/V4.1 so /render
can skip vision-tower inputs.

Claims

• Image-only GLM-5.3-Flash and DeepSeek V4/V4.1 routing metadata matches
  full processing exactly.
• DeepSeek live HTTP /render on the mixed
  text+image+text+image+text prompt (840 tokens), unique media,
  return_mm_kwargs=false:

offered load	unoptimized p50 / p95	adapter p50 / p95
sequential n=15	102.2 / 117.5 ms	10.2 / 11.4 ms
20 RPS × 8s	51.0 / 67.0 ms	9.4 / 10.6 ms
25 RPS × 8s	444 / 1064 ms	9.1 / 10.2 ms

• GLM processor A/B (same commit, in-process): 4.0–4.3× p50, exact parity.
  Live GLM vllm launch render was not started; see Details.

Validation

pytest -q tests/models/multimodal/processing/test_glm5next.py \
  tests/models/multimodal/processing/test_deepseek_v4_vl.py \
  -k routing_metadata

CI: multimodal processor shard. DeepSeek GPU generate / KV hits were not
measured: NVIDIA sparse-MLA requires compute capability 9/10, and the
available cluster has A100/L40S.

Details

These processors currently derive image replacements from processed tensors
or layout types. The adapters compute the same geometry from source
dimensions. DeepSeek V4 and V4.1 keep separate preprocess modules because
their existing image math already lives in those files.

The DeepSeek CPU placeholder is registered as multimodal so a CPU render
process can build routing metadata. Instantiating that placeholder for
generation remains unsupported.

GLM-5.3-Flash vllm launch render currently fails while constructing
VllmConfig: encoder-only/CPU launch disables prefix caching after the
hybrid-Mamba hook sets mamba_block_size. That is an existing config-order
issue, not introduced here. GPU vllm serve is a separate path.

AI assistance was used. A human submitter reviewed the diff.

---

Pull Request Checklist

• I used vLLM's /pr-checklist skill. (Mandatory for agents, optional for humans).

• AI assistance was used during the creation of this PR.

• Design Fit: Minimizes impact on core components, reuses existing functionality, and justifies added complexity.

• Testing and Validation: Validates the change and ensures any added tests are meaningful and reliable, with CI coverage or documented CI resource constraints and validation performed outside CI.

• Code Quality and Style: Keeps code and comments clear and concise, and updates relevant documentation and examples.

• Pull Request Contents: Includes a brief summary and relevant links, supports claims with evidence, explains root causes and implementation trade-offs, and follows the contributing guide.

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[mergify]

Documentation preview: https://vllm--61418.org.readthedocs.build/en/61418/

[mergify]

This pull request has merge conflicts that must be resolved before it can be
merged. Please rebase the PR, @guygir.

https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork