[Reasoning] Add glm47 reasoning parser for GLM-4.7 models

[QwertyJack]

Summary

GLM-4.7 models have a different chat template than GLM-4.5/4.6 models:

• GLM-4.5/4.6: <think> is NOT included in the generation prompt
• GLM-4.7: <think> IS included in the generation prompt

This means GLM-4.7 should use DeepSeekR1ReasoningParser instead of DeepSeekV3ReasoningWithThinkingParser used by GLM-4.5/4.6.

Changes

• Add glm47 reasoning parser registration
• Add tests for glm47 reasoning parser
• Update documentation to include GLM-4.7 series

Test plan

• All 24 new tests pass for glm47 reasoning parser
• Existing glm45 tests still pass

Fixes #33348

[mergify]

Documentation preview: https://vllm--33349.org.readthedocs.build/en/33349/

[gemini-code-assist]

Code Review

This pull request adds support for GLM-4.7 reasoning models by aliasing the glm47 parser to the existing DeepSeekR1ReasoningParser. The changes are well-structured, including updates to documentation, registration of the new parser, and a comprehensive new test suite. The approach of reusing an existing parser is sound given the model's behavior.

My main feedback is regarding the new test file, which introduces significant code duplication. While the tests themselves are thorough, refactoring them to be more reusable would greatly improve the long-term maintainability of the test suite. I've left a specific comment with a suggestion on how to achieve this.

[QwertyJack]

@zRzRzRzRzRzRzR PTAL

[chaunceyjiang]

Have you tested --reasoning-parser=glm45?

[QwertyJack]

After further investigation, I found that:

1. v0.13.0 had a bug - the old Glm4MoeModelReasoningParser had issues that caused thinking to be mixed with content for GLM-4.7

2. This was fixed in recent PRs:

   • PR fix no think of GLM-4.5 / GLM-4.7 #31449 simplified Glm4MoeModelReasoningParser to inherit from DeepSeekR1ReasoningParser
   • PR [Frontend] Support GLM-4.5 / GLM-4.7 with enable_thinking: false #31788 changed it to inherit from Holo2ReasoningParser for enable_thinking: false support
   • PR [Misc] Provide a DeepSeek ReasoningParser with thinking enabled by default #33221 (by @chaunceyjiang, merged 2 days ago) further simplified by removing Glm4MoeModelReasoningParser entirely and having glm45 use DeepSeekV3ReasoningWithThinkingParser directly

3. Current state on main: glm45 now uses DeepSeekV3ReasoningWithThinkingParser which defaults to thinking=True and delegates to DeepSeekR1ReasoningParser - this should work for both GLM-4.5/4.6 and GLM-4.7

Given that the recent refactoring has unified the parser, I can see the argument that a separate glm47 parser may not be strictly necessary anymore.

However, having glm47 as an explicit alias still provides:

• Clear semantic mapping for users (GLM-4.7 → glm47)
• Consistency with the existing glm47 tool parser

@chaunceyjiang What do you think? Should we keep the glm47 alias, or is the current glm45 sufficient for all GLM-4.x models?

[chaunceyjiang]

current glm45 sufficient for all GLM-4.x models

+1

[QwertyJack]

Closing this PR based on feedback from @chaunceyjiang.

After investigation, we found that:

1. The issue in v0.13.0 has been fixed in recent PRs (fix no think of GLM-4.5 / GLM-4.7 #31449, [Frontend] Support GLM-4.5 / GLM-4.7 with enable_thinking: false #31788, [Misc] Provide a DeepSeek ReasoningParser with thinking enabled by default #33221)
2. Current main branch: glm45 now uses DeepSeekV3ReasoningWithThinkingParser which works correctly for all GLM-4.x models (GLM-4.5, GLM-4.6, and GLM-4.7)

A separate glm47 parser is not needed - users should use --reasoning-parser=glm45 for all GLM-4.x models.

Thanks for the review!