Update README.md

README.md

@@ -55,9 +55,10 @@ More details on the training of Trinity Large are available in the [technical re
 
 ## Model Variants
 
-The Trinity Large family consists of three checkpoints from the same training run:
+The Trinity Large family consists of four checkpoints from the same training run:
 
 - **[Trinity-Large-Preview](https://huggingface.co/arcee-ai/Trinity-Large-Preview)**: Lightly post-trained, chat-ready model undergoing active RL
+- **[Trinity-Large-Thinking](https://huggingface.co/arcee-ai/Trinity-Large-Thinking)**: Reasoning-optimized, agentic post-training with extended chain-of-thought
 - **[Trinity-Large-TrueBase](https://huggingface.co/arcee-ai/Trinity-Large-TrueBase)**: 10T-token pre-anneal pretraining checkpoint
 - **[Trinity-Large-Base](https://huggingface.co/arcee-ai/Trinity-Large-Base)**: Full 17T-token pretrained foundation model with mid-training anneals