Update gptoss-fp4-h200-vllm vLLM image to v0.20.2\n\nRef #1154

Author: Klaud-Cold

.github/configs/nvidia-master.yaml

@@ -4306,7 +4306,7 @@ gptoss-fp4-h200-trt:
       - { tp: 8, ep: 8, dp-attn: false, conc-start: 4, conc-end: 8 }
 
 gptoss-fp4-h200-vllm:
-  image: vllm/vllm-openai:v0.18.0
+  image: vllm/vllm-openai:v0.20.2
   model: openai/gpt-oss-120b
   model-prefix: gptoss
   runner: h200

perf-changelog.yaml

@@ -2329,6 +2329,12 @@
     - "Add Qwen3.5-397B-A17B FP8 MI355X ATOM benchmark configs with and without MTP"
   pr-link: https://github.com/SemiAnalysisAI/InferenceX/pull/1310
 
+- config-keys:
+    - gptoss-fp4-h200-vllm
+  description:
+    - "Update vLLM image from v0.18.0 to v0.20.2"
+  pr-link: https://github.com/SemiAnalysisAI/InferenceX/pull/1335
+
 - config-keys:
     - gptoss-fp4-h100-vllm
   description: