diff --git a/packages/ai/CHANGELOG.md b/packages/ai/CHANGELOG.md
index c3b9c3e4..61502e6b 100644
--- a/packages/ai/CHANGELOG.md
+++ b/packages/ai/CHANGELOG.md
@@ -5,6 +5,7 @@
 ### Fixed
 
 - Fixed Anthropic provider to handle `sensitive` stop_reason returned by API ([#978](https://github.com/badlogic/pi-mono/issues/978))
+- Fixed DeepSeek API compatibility by detecting `deepseek.com` URLs and disabling unsupported `developer` role ([#1048](https://github.com/badlogic/pi-mono/issues/1048))
 
 ## [0.50.1] - 2026-01-26
 
diff --git a/packages/ai/src/providers/openai-completions.ts b/packages/ai/src/providers/openai-completions.ts
index c4332b3c..5724ad93 100644
--- a/packages/ai/src/providers/openai-completions.ts
+++ b/packages/ai/src/providers/openai-completions.ts
@@ -763,6 +763,7 @@ function detectCompat(model: Model<"openai-completions">): Required<OpenAIComple
 		provider === "mistral" ||
 		baseUrl.includes("mistral.ai") ||
 		baseUrl.includes("chutes.ai") ||
+		baseUrl.includes("deepseek.com") ||
 		isZai ||
 		provider === "opencode" ||
 		baseUrl.includes("opencode.ai");