diff --git a/Cargo.lock b/Cargo.lock
index 479e94d7..6b6cb7a7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4239,7 +4239,7 @@ dependencies = [
  "tracing",
  "tracing-opentelemetry 0.27.0",
  "tracing-subscriber",
- "utoipa 5.1.2",
+ "utoipa",
 ]
 
 [[package]]
@@ -4368,7 +4368,7 @@ dependencies = [
  "tracing-opentelemetry 0.21.0",
  "tracing-subscriber",
  "ureq",
- "utoipa 4.2.3",
+ "utoipa",
  "utoipa-swagger-ui",
  "uuid",
  "vergen",
@@ -4419,7 +4419,7 @@ dependencies = [
  "tracing",
  "tracing-opentelemetry 0.21.0",
  "tracing-subscriber",
- "utoipa 4.2.3",
+ "utoipa",
  "utoipa-swagger-ui",
 ]
 
@@ -4470,7 +4470,7 @@ dependencies = [
  "tracing",
  "tracing-opentelemetry 0.21.0",
  "tracing-subscriber",
- "utoipa 4.2.3",
+ "utoipa",
  "utoipa-swagger-ui",
 ]
 
@@ -5192,19 +5192,7 @@ dependencies = [
  "indexmap 2.6.0",
  "serde",
  "serde_json",
- "utoipa-gen 4.3.0",
-]
-
-[[package]]
-name = "utoipa"
-version = "5.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5e12e84f0ff45b6818029cd0f67280e453c80132c1b9897df407ecc20b9f7cfd"
-dependencies = [
- "indexmap 2.5.0",
- "serde",
- "serde_json",
- "utoipa-gen 5.1.2",
+ "utoipa-gen",
 ]
 
 [[package]]
@@ -5220,18 +5208,6 @@ dependencies = [
  "syn 2.0.85",
 ]
 
-[[package]]
-name = "utoipa-gen"
-version = "5.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0dfc694d3a3118d2b9e80d68be83bf1aab7988510916934db83da61c14e7e6b2"
-dependencies = [
- "proc-macro2",
- "quote",
- "regex",
- "syn 2.0.79",
-]
-
 [[package]]
 name = "utoipa-swagger-ui"
 version = "6.0.0"
@@ -5244,7 +5220,7 @@ dependencies = [
  "rust-embed",
  "serde",
  "serde_json",
- "utoipa 4.2.3",
+ "utoipa",
  "zip",
 ]
 
diff --git a/backends/llamacpp/Cargo.toml b/backends/llamacpp/Cargo.toml
index 4a14dcdf..48a0bb84 100644
--- a/backends/llamacpp/Cargo.toml
+++ b/backends/llamacpp/Cargo.toml
@@ -22,7 +22,7 @@ tokenizers = { workspace = true }
 tracing = "0.1"
 tracing-opentelemetry = "0.27.0"
 tracing-subscriber = { version = "0.3", features = ["json", "env-filter"] }
-utoipa = { version = "5.1.2", features = ["axum_extras"] }
+utoipa = { version = "4.2.3", features = ["axum_extras"] }
 log = "0.4.22"
 
 [build-dependencies]
diff --git a/backends/llamacpp/src/main.rs b/backends/llamacpp/src/main.rs
index 62f81848..f128a6a3 100644
--- a/backends/llamacpp/src/main.rs
+++ b/backends/llamacpp/src/main.rs
@@ -1,6 +1,7 @@
 use clap::{Parser, Subcommand};
 use std::path::PathBuf;
 use text_generation_backend_llamacpp::backend::{LlamaCppBackend, LlamaCppBackendError};
+use text_generation_router::server::ApiDoc;
 use text_generation_router::{server, usage_stats};
 use thiserror::Error;
 
@@ -35,13 +36,8 @@ struct Args {
     port: u16,
     #[clap(long, env, help = "Path to GGUF model file(s) to load")]
     gguf_path: PathBuf,
-    #[clap(
-        long,
-        env,
-        default_value = "1",
-        help = "Number of CPU threads allocated to one llama.cpp model"
-    )]
-    cores_per_instance: u16,
+    #[clap(long, env, default_value = "1", help = "Number of model instance(s)")]
+    num_model_instance: u16,
     #[clap(default_value = "bigscience/bloom", long, env)]
     tokenizer_name: String,
     #[clap(long, env)]
@@ -67,8 +63,6 @@ struct Args {
     #[clap(long, env)]
     ngrok_edge: Option<String>,
     #[clap(long, env, default_value_t = false)]
-    messages_api_enabled: bool,
-    #[clap(long, env, default_value_t = false)]
     disable_grammar_support: bool,
     #[clap(default_value = "4", long, env)]
     max_client_batch_size: usize,
@@ -100,7 +94,7 @@ async fn main() -> Result<(), RouterError> {
         hostname,
         port,
         gguf_path,
-        cores_per_instance,
+        num_model_instance,
         tokenizer_name,
         tokenizer_config_path,
         revision,
@@ -113,19 +107,17 @@ async fn main() -> Result<(), RouterError> {
         ngrok,
         ngrok_authtoken,
         ngrok_edge,
-        messages_api_enabled,
         disable_grammar_support,
         max_client_batch_size,
         usage_stats,
     } = args;
 
-    // if let Some(Commands::PrintSchema) = command {
-    //     use utoipa::OpenApi;
-    //     let api_doc = ApiDoc::openapi();
-    //     let api_doc = serde_json::to_string_pretty(&api_doc).unwrap();
-    //     println!("{}", api_doc);
-    //     std::process::exit(0);
-    // };
+    if let Some(Commands::PrintSchema) = command {
+        use utoipa::OpenApi;
+        let api_doc = ApiDoc::openapi().to_pretty_json().unwrap();
+        println!("{}", api_doc);
+        std::process::exit(0);
+    };
     text_generation_router::logging::init_logging(otlp_endpoint, otlp_service_name, json_output);
 
     // Validate args
@@ -144,11 +136,11 @@ async fn main() -> Result<(), RouterError> {
         ));
     }
 
-    if let Some(ref max_batch_total_tokens) = max_batch_total_tokens {
-        if max_batch_prefill_tokens > *max_batch_total_tokens {
+    if let Some(max_batch_total_tokens) = max_batch_total_tokens {
+        if max_batch_prefill_tokens > max_batch_total_tokens {
             return Err(RouterError::ArgumentValidation(format!("`max_batch_prefill_tokens` must be <= `max_batch_total_tokens`. Given: {max_batch_prefill_tokens} and {max_batch_total_tokens}")));
         }
-        if max_total_tokens as u32 > *max_batch_total_tokens {
+        if max_total_tokens as u32 > max_batch_total_tokens {
             return Err(RouterError::ArgumentValidation(format!("`max_total_tokens` must be <= `max_batch_total_tokens`. Given: {max_total_tokens} and {max_batch_total_tokens}")));
         }
     }
@@ -177,13 +169,13 @@ async fn main() -> Result<(), RouterError> {
         tokenizer_name,
         tokenizer_config_path,
         revision,
+        false,
         hostname,
         port,
         cors_allow_origin,
         ngrok,
         ngrok_authtoken,
         ngrok_edge,
-        messages_api_enabled,
         disable_grammar_support,
         max_client_batch_size,
         usage_stats,