feat: support ai21 client (#800)

2 files changed, 3 insertions, 1 deletions

diff --git a/src/client/mod.rs b/src/client/mod.rs
index 5a4a9ac..9d6dfb0 100644
--- a/src/client/mod.rs
+++ b/src/client/mod.rs
@@ -40,7 +40,8 @@ register_client!(
     (qianwen, "qianwen", QianwenConfig, QianwenClient),
 );
 
-pub const OPENAI_COMPATIBLE_PLATFORMS: [(&str, &str); 15] = [
+pub const OPENAI_COMPATIBLE_PLATFORMS: [(&str, &str); 16] = [
+    ("ai21", "https://api.ai21.com/studio/v1"),
     ("deepinfra", "https://api.deepinfra.com/v1/openai"),
     ("deepseek", "https://api.deepseek.com"),
     ("fireworks", "https://api.fireworks.ai/inference/v1"),
diff --git a/src/client/openai.rs b/src/client/openai.rs
index 3e1707f..ed577bc 100644
--- a/src/client/openai.rs
+++ b/src/client/openai.rs
@@ -206,6 +206,7 @@ pub fn openai_build_chat_completions_body(data: ChatCompletionsData, model: &Mod
                             },
                         })
                     }).collect();
+                    let text = if text.is_empty() { Value::Null } else { text.into() };
                     let mut messages = vec![
                         json!({ "role": MessageRole::Assistant, "content": text, "tool_calls": tool_calls })
                     ];