diff --git a/README b/README
index f3cb1dd..6aff966 100644
--- a/README
+++ b/README
@@ -12,6 +12,7 @@ The following models are included in the benchmark run.
 google/gemini-3-pro-preview TEMP:0.35
 anthropic/claude-opus-4.5 TEMP:0.7
 openai/gpt-5.1-codex
+x-ai/grok-4
 anthropic/claude-sonnet-4.5 TEMP:0.7
 moonshotai/kimi-k2-thinking
 <!-- MODELS_END -->