llm/oai: add (recent) deepseek-r1

spoiler alert: it doesn't work very well out of the box,
not going to invest in it further.

Co-Authored-By: sketch <hello@sketch.dev>
Change-ID: sb7d25a8ee838dce1k
diff --git a/llm/oai/oai.go b/llm/oai/oai.go
index 840a922..654cea4 100644
--- a/llm/oai/oai.go
+++ b/llm/oai/oai.go
@@ -141,6 +141,14 @@
 		APIKeyEnv: TogetherAPIKeyEnv,
 	}
 
+	TogetherDeepseekR1 = Model{
+		UserName:  "together-deepseek-r1",
+		ModelName: "deepseek-ai/DeepSeek-R1",
+		URL:       TogetherURL,
+		Cost:      ModelCost{Input: 300, Output: 700},
+		APIKeyEnv: TogetherAPIKeyEnv,
+	}
+
 	TogetherLlama4Maverick = Model{
 		UserName:  "together-llama4-maverick",
 		ModelName: "meta-llama/Llama-4-Maverick-17B-128E-Instruct-FP8",
@@ -246,6 +254,7 @@
 	Gemini25Flash,
 	Gemini25Pro,
 	TogetherDeepseekV3,
+	TogetherDeepseekR1,
 	TogetherLlama4Maverick,
 	TogetherLlama3_3_70B,
 	TogetherMistralSmall,