GLM-5.2 — Pantheon
  
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    # GLM-5.2

    
Zhipu / Z.ai · Jun 2026
    
Open release plus an agent harness aimed squarely at Anthropic; press benchmarked it against Claude Mythos on vulnerability detection. GLM 5.5 reportedly due Aug 2026.

    
## Sources

    
### Official

    

      
- 2026-06-13 [SCMP: Zhipu releases GLM-5.2 harness](https://www.scmp.com/tech/tech-trends/article/3359170/zhipu-ai-releases-harness-glm-52-model-chinese-firm-takes-aim-anthropic) — the Anthropic-shaped ambition.
      
- 2026-06 [SCMP: stock rockets on open-source GLM-5.2](https://www.scmp.com/tech/tech-trends/article/3357115/zhipu-ais-stock-rockets-after-chinese-firm-makes-glm-52-open-source) — market reaction.
    
    
### Writing & commentary

    
tk — to collect
    
### Tweets

    
tk — fleet pass pending; mirror to archive

    
## Official record

    
tk — release date, specs, benchmarks, checkpoints

    
## History

    
tk — context of the world at release; events and entanglements

    
## Impressions

    
tk — day-of and longitudinal vibes to collect
    
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