diff --git a/Cargo.lock b/Cargo.lock
index c9cb28484c..971a8646cd 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -453,12 +453,6 @@ dependencies = [
  "windows-targets 0.52.6",
 ]
 
-[[package]]
-name = "base64"
-version = "0.21.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9d297deb1925b89f2ccc13d7635fa0714f12c87adce1c75356b39ca9b7178567"
-
 [[package]]
 name = "base64"
 version = "0.22.1"
@@ -1263,7 +1257,7 @@ name = "docx-parser"
 version = "0.1.1"
 source = "git+https://github.com/toeverything/docx-parser#278ba3eeb29bbf1ee7958b02436e4402af61859b"
 dependencies = [
- "base64 0.22.1",
+ "base64",
  "clap",
  "docx-rust",
  "serde",
@@ -1826,7 +1820,7 @@ dependencies = [
  "js-sys",
  "log",
  "wasm-bindgen",
- "windows-core 0.57.0",
+ "windows-core 0.61.2",
 ]
 
 [[package]]
@@ -1838,18 +1832,6 @@ dependencies = [
  "cc",
 ]
 
-[[package]]
-name = "icu_collections"
-version = "1.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "db2fa452206ebee18c4b5c2274dbf1de17008e874b4dc4f0aea9d01ca79e4526"
-dependencies = [
- "displaydoc",
- "yoke 0.7.5",
- "zerofrom",
- "zerovec 0.10.4",
-]
-
 [[package]]
 name = "icu_collections"
 version = "2.0.0"
@@ -1858,9 +1840,25 @@ checksum = "200072f5d0e3614556f94a9930d5dc3e0662a652823904c3a75dc3b0af7fee47"
 dependencies = [
  "displaydoc",
  "potential_utf",
- "yoke 0.8.0",
+ "yoke",
  "zerofrom",
- "zerovec 0.11.2",
+ "zerovec",
+]
+
+[[package]]
+name = "icu_locale"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6ae5921528335e91da1b6c695dbf1ec37df5ac13faa3f91e5640be93aa2fbefd"
+dependencies = [
+ "displaydoc",
+ "icu_collections",
+ "icu_locale_core",
+ "icu_locale_data",
+ "icu_provider",
+ "potential_utf",
+ "tinystr",
+ "zerovec",
 ]
 
 [[package]]
@@ -1870,23 +1868,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0cde2700ccaed3872079a65fb1a78f6c0a36c91570f28755dda67bc8f7d9f00a"
 dependencies = [
  "displaydoc",
- "litemap 0.8.0",
- "tinystr 0.8.1",
- "writeable 0.6.1",
- "zerovec 0.11.2",
+ "litemap",
+ "tinystr",
+ "writeable",
+ "zerovec",
 ]
 
 [[package]]
-name = "icu_locid"
-version = "1.5.0"
+name = "icu_locale_data"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "13acbb8371917fc971be86fc8057c41a64b521c184808a698c02acc242dbf637"
-dependencies = [
- "displaydoc",
- "litemap 0.7.5",
- "tinystr 0.7.6",
- "writeable 0.5.5",
-]
+checksum = "4fdef0c124749d06a743c69e938350816554eb63ac979166590e2b4ee4252765"
 
 [[package]]
 name = "icu_normalizer"
@@ -1895,12 +1887,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "436880e8e18df4d7bbc06d58432329d6458cc84531f7ac5f024e93deadb37979"
 dependencies = [
  "displaydoc",
- "icu_collections 2.0.0",
+ "icu_collections",
  "icu_normalizer_data",
  "icu_properties",
- "icu_provider 2.0.0",
+ "icu_provider",
  "smallvec",
- "zerovec 0.11.2",
+ "zerovec",
 ]
 
 [[package]]
@@ -1916,13 +1908,13 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "016c619c1eeb94efb86809b015c58f479963de65bdb6253345c1a1276f22e32b"
 dependencies = [
  "displaydoc",
- "icu_collections 2.0.0",
+ "icu_collections",
  "icu_locale_core",
  "icu_properties_data",
- "icu_provider 2.0.0",
+ "icu_provider",
  "potential_utf",
  "zerotrie",
- "zerovec 0.11.2",
+ "zerovec",
 ]
 
 [[package]]
@@ -1931,23 +1923,6 @@ version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "298459143998310acd25ffe6810ed544932242d3f07083eee1084d83a71bd632"
 
-[[package]]
-name = "icu_provider"
-version = "1.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6ed421c8a8ef78d3e2dbc98a973be2f3770cb42b606e3ab18d6237c4dfde68d9"
-dependencies = [
- "displaydoc",
- "icu_locid",
- "icu_provider_macros",
- "stable_deref_trait",
- "tinystr 0.7.6",
- "writeable 0.5.5",
- "yoke 0.7.5",
- "zerofrom",
- "zerovec 0.10.4",
-]
-
 [[package]]
 name = "icu_provider"
 version = "2.0.0"
@@ -1957,46 +1932,37 @@ dependencies = [
  "displaydoc",
  "icu_locale_core",
  "stable_deref_trait",
- "tinystr 0.8.1",
- "writeable 0.6.1",
- "yoke 0.8.0",
+ "tinystr",
+ "writeable",
+ "yoke",
  "zerofrom",
  "zerotrie",
- "zerovec 0.11.2",
-]
-
-[[package]]
-name = "icu_provider_macros"
-version = "1.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1ec89e9337638ecdc08744df490b221a7399bf8d164eb52a665454e60e075ad6"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.101",
+ "zerovec",
 ]
 
 [[package]]
 name = "icu_segmenter"
-version = "1.5.0"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a717725612346ffc2d7b42c94b820db6908048f39434504cb130e8b46256b0de"
+checksum = "e185fc13b6401c138cf40db12b863b35f5edf31b88192a545857b41aeaf7d3d3"
 dependencies = [
  "core_maths",
  "displaydoc",
- "icu_collections 1.5.0",
- "icu_locid",
- "icu_provider 1.5.0",
+ "icu_collections",
+ "icu_locale",
+ "icu_locale_core",
+ "icu_provider",
  "icu_segmenter_data",
+ "potential_utf",
  "utf8_iter",
- "zerovec 0.10.4",
+ "zerovec",
 ]
 
 [[package]]
 name = "icu_segmenter_data"
-version = "1.5.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1e52775179941363cc594e49ce99284d13d6948928d8e72c755f55e98caa1eb"
+checksum = "5360a2fbe97f617c4f8b944356dedb36d423f7da7f13c070995cf89e59f01220"
 
 [[package]]
 name = "idna"
@@ -2193,7 +2159,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "07033963ba89ebaf1584d767badaa2e8fcec21aedea6b8c0346d487d49c28667"
 dependencies = [
  "cfg-if",
- "windows-targets 0.48.5",
+ "windows-targets 0.52.6",
 ]
 
 [[package]]
@@ -2229,12 +2195,6 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cd945864f07fe9f5371a27ad7b52a172b4b499999f1d97574c9fa68373937e12"
 
-[[package]]
-name = "litemap"
-version = "0.7.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "23fb14cb19457329c82206317a5663005a4d404783dc74f4252769b0d5f42856"
-
 [[package]]
 name = "litemap"
 version = "0.8.0"
@@ -2963,7 +2923,8 @@ version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e5a7c30837279ca13e7c867e9e40053bc68740f988cb07f7ca6df43cc734b585"
 dependencies = [
- "zerovec 0.11.2",
+ "serde",
+ "zerovec",
 ]
 
 [[package]]
@@ -3770,7 +3731,7 @@ version = "0.8.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ee6798b1838b6a0f69c007c133b8df5866302197e404e8b6ee8ed3e3a5e68dc6"
 dependencies = [
- "base64 0.22.1",
+ "base64",
  "bytes",
  "chrono",
  "crc",
@@ -3846,7 +3807,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "aa003f0038df784eb8fecbbac13affe3da23b45194bd57dba231c8f48199c526"
 dependencies = [
  "atoi",
- "base64 0.22.1",
+ "base64",
  "bitflags 2.9.1",
  "byteorder",
  "bytes",
@@ -3889,7 +3850,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "db58fcd5a53cf07c184b154801ff91347e4c30d17a3562a635ff028ad5deda46"
 dependencies = [
  "atoi",
- "base64 0.22.1",
+ "base64",
  "bitflags 2.9.1",
  "byteorder",
  "chrono",
@@ -4300,14 +4261,14 @@ dependencies = [
 
 [[package]]
 name = "text-splitter"
-version = "0.25.1"
+version = "0.27.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d8130aecc3b7938ce3ea387d7615eca92bd4f702a5adc0548ba930a9c039dda4"
+checksum = "9f7e97f5863248f7d07896a1816bd4110cb1b0b122741f157d702121a270bf33"
 dependencies = [
  "ahash",
  "auto_enums",
  "either",
- "icu_provider 1.5.0",
+ "icu_provider",
  "icu_segmenter",
  "itertools 0.14.0",
  "memchr",
@@ -4378,29 +4339,19 @@ dependencies = [
 
 [[package]]
 name = "tiktoken-rs"
-version = "0.6.0"
+version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "44075987ee2486402f0808505dd65692163d243a337fc54363d49afac41087f6"
+checksum = "25563eeba904d770acf527e8b370fe9a5547bacd20ff84a0b6c3bc41288e5625"
 dependencies = [
  "anyhow",
- "base64 0.21.7",
+ "base64",
  "bstr",
  "fancy-regex",
  "lazy_static",
- "parking_lot",
  "regex",
  "rustc-hash 1.1.0",
 ]
 
-[[package]]
-name = "tinystr"
-version = "0.7.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9117f5d4db391c1cf6927e7bea3db74b9a1c1add8f7eda9ffd5364f40f57b82f"
-dependencies = [
- "displaydoc",
-]
-
 [[package]]
 name = "tinystr"
 version = "0.8.1"
@@ -4408,7 +4359,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5d4f6d1145dcb577acf783d4e601bc1d76a13337bb54e6233add580b07344c8b"
 dependencies = [
  "displaydoc",
- "zerovec 0.11.2",
+ "zerovec",
 ]
 
 [[package]]
@@ -4590,9 +4541,9 @@ dependencies = [
 
 [[package]]
 name = "tree-sitter-c"
-version = "0.23.4"
+version = "0.24.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "afd2b1bf1585dc2ef6d69e87d01db8adb059006649dd5f96f31aa789ee6e9c71"
+checksum = "1a3aad8f0129083a59fe8596157552d2bb7148c492d44c21558d68ca1c722707"
 dependencies = [
  "cc",
  "tree-sitter-language",
@@ -5165,7 +5116,7 @@ version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf221c93e13a30d793f7645a0e7762c55d169dbb0a49671918a2319d289b10bb"
 dependencies = [
- "windows-sys 0.48.0",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -5504,12 +5455,6 @@ dependencies = [
  "bitflags 2.9.1",
 ]
 
-[[package]]
-name = "writeable"
-version = "0.5.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e9df38ee2d2c3c5948ea468a8406ff0db0b29ae1ffde1bcf20ef305bcc95c51"
-
 [[package]]
 name = "writeable"
 version = "0.6.1"
@@ -5614,18 +5559,6 @@ dependencies = [
  "yrs 0.17.4",
 ]
 
-[[package]]
-name = "yoke"
-version = "0.7.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "120e6aef9aa629e3d4f52dc8cc43a015c7724194c97dfaf45180d2daf2b77f40"
-dependencies = [
- "serde",
- "stable_deref_trait",
- "yoke-derive 0.7.5",
- "zerofrom",
-]
-
 [[package]]
 name = "yoke"
 version = "0.8.0"
@@ -5634,22 +5567,10 @@ checksum = "5f41bb01b8226ef4bfd589436a297c53d118f65921786300e427be8d487695cc"
 dependencies = [
  "serde",
  "stable_deref_trait",
- "yoke-derive 0.8.0",
+ "yoke-derive",
  "zerofrom",
 ]
 
-[[package]]
-name = "yoke-derive"
-version = "0.7.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2380878cad4ac9aac1e2435f3eb4020e8374b5f13c296cb75b4620ff8e229154"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.101",
- "synstructure",
-]
-
 [[package]]
 name = "yoke-derive"
 version = "0.8.0"
@@ -5749,41 +5670,19 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "36f0bbd478583f79edad978b407914f61b2972f5af6fa089686016be8f9af595"
 dependencies = [
  "displaydoc",
- "yoke 0.8.0",
+ "yoke",
  "zerofrom",
 ]
 
-[[package]]
-name = "zerovec"
-version = "0.10.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "aa2b893d79df23bfb12d5461018d408ea19dfafe76c2c7ef6d4eba614f8ff079"
-dependencies = [
- "yoke 0.7.5",
- "zerofrom",
- "zerovec-derive 0.10.3",
-]
-
 [[package]]
 name = "zerovec"
 version = "0.11.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4a05eb080e015ba39cc9e23bbe5e7fb04d5fb040350f99f34e338d5fdd294428"
 dependencies = [
- "yoke 0.8.0",
+ "yoke",
  "zerofrom",
- "zerovec-derive 0.11.1",
-]
-
-[[package]]
-name = "zerovec-derive"
-version = "0.10.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6eafa6dfb17584ea3e2bd6e76e0cc15ad7af12b09abdd1ca55961bed9b1063c6"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.101",
+ "zerovec-derive",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index f5e0cd8b5c..6c2495aa3c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -77,12 +77,12 @@ smol_str               = "0.3"
 sqlx                   = { version = "0.8", default-features = false, features = ["chrono", "macros", "migrate", "runtime-tokio", "sqlite", "tls-rustls"] }
 strum_macros           = "0.27.0"
 symphonia              = { version = "0.5", features = ["all", "opt-simd"] }
-text-splitter          = "0.25"
+text-splitter          = "0.27"
 thiserror              = "2"
-tiktoken-rs            = "0.6"
+tiktoken-rs            = "0.7"
 tokio                  = "1.45"
 tree-sitter            = { version = "0.25" }
-tree-sitter-c          = { version = "0.23" }
+tree-sitter-c          = { version = "0.24" }
 tree-sitter-c-sharp    = { version = "0.23" }
 tree-sitter-cpp        = { version = "0.23" }
 tree-sitter-go         = { version = "0.23" }
diff --git a/packages/backend/native/src/tiktoken.rs b/packages/backend/native/src/tiktoken.rs
index 7c76219b71..919e952940 100644
--- a/packages/backend/native/src/tiktoken.rs
+++ b/packages/backend/native/src/tiktoken.rs
@@ -15,16 +15,25 @@ pub fn from_model_name(model_name: String) -> Option<Tokenizer> {
 impl Tokenizer {
   #[napi]
   pub fn count(&self, content: String, allowed_special: Option<Vec<String>>) -> u32 {
-    self
-      .inner
-      .encode(
-        &content,
-        if let Some(allowed_special) = &allowed_special {
-          HashSet::from_iter(allowed_special.iter().map(|s| s.as_str()))
-        } else {
-          Default::default()
-        },
-      )
-      .len() as u32
+    let allowed_special = if let Some(allowed_special) = &allowed_special {
+      HashSet::from_iter(allowed_special.iter().map(|s| s.as_str()))
+    } else {
+      Default::default()
+    };
+
+    self.inner.encode(&content, &allowed_special).0.len() as u32
+  }
+}
+
+#[cfg(test)]
+mod tests {
+  use super::*;
+
+  #[test]
+  fn test_tokenizer() {
+    let tokenizer = from_model_name("gpt-4.1".to_string()).unwrap();
+    let content = "Hello, world!";
+    let count = tokenizer.count(content.to_string(), None);
+    assert!(count > 0);
   }
 }
diff --git a/packages/backend/server/src/plugins/copilot/session.ts b/packages/backend/server/src/plugins/copilot/session.ts
index 3693dbc7ee..56f4140a07 100644
--- a/packages/backend/server/src/plugins/copilot/session.ts
+++ b/packages/backend/server/src/plugins/copilot/session.ts
@@ -19,7 +19,6 @@ import { ChatMessageCache } from './message';
 import { PromptService } from './prompt';
 import { PromptMessage, PromptParams } from './providers';
 import {
-  AvailableModel,
   ChatHistory,
   ChatMessage,
   ChatMessageSchema,
@@ -38,7 +37,7 @@ export class ChatSession implements AsyncDisposable {
     private readonly messageCache: ChatMessageCache,
     private readonly state: ChatSessionState,
     private readonly dispose?: (state: ChatSessionState) => Promise<void>,
-    private readonly maxTokenSize = 3840
+    private readonly maxTokenSize = state.prompt.config?.maxTokens || 128 * 1024
   ) {}
 
   get model() {
@@ -297,8 +296,8 @@ export class ChatSessionService {
               messageCost: { increment: userMessages.length },
               tokenCost: {
                 increment: this.calculateTokenSize(
-                  userMessages,
-                  state.prompt.model as AvailableModel
+                  state.messages,
+                  state.prompt.model
                 ),
               },
             },
@@ -402,10 +401,7 @@ export class ChatSessionService {
     });
   }
 
-  private calculateTokenSize(
-    messages: PromptMessage[],
-    model: AvailableModel
-  ): number {
+  private calculateTokenSize(messages: PromptMessage[], model: string): number {
     const encoder = getTokenEncoder(model);
     return messages
       .map(m => encoder?.count(m.content) ?? 0)
diff --git a/packages/backend/server/src/plugins/copilot/types.ts b/packages/backend/server/src/plugins/copilot/types.ts
index 9aefd70f55..07fb796b89 100644
--- a/packages/backend/server/src/plugins/copilot/types.ts
+++ b/packages/backend/server/src/plugins/copilot/types.ts
@@ -47,26 +47,24 @@ export enum AvailableModels {
   Gpt41 = 'gpt-4.1',
   Gpt410414 = 'gpt-4.1-2025-04-14',
   Gpt41Mini = 'gpt-4.1-mini',
+  Gpt41Nano = 'gpt-4.1-nano',
   // embeddings
   TextEmbedding3Large = 'text-embedding-3-large',
   TextEmbedding3Small = 'text-embedding-3-small',
   TextEmbeddingAda002 = 'text-embedding-ada-002',
-  // moderation
-  TextModerationLatest = 'text-moderation-latest',
-  TextModerationStable = 'text-moderation-stable',
   // text to image
   DallE3 = 'dall-e-3',
+  GptImage = 'gpt-image-1',
 }
 
-export type AvailableModel = keyof typeof AvailableModels;
+const availableModels = Object.values(AvailableModels);
 
 export function getTokenEncoder(model?: string | null): Tokenizer | null {
   if (!model) return null;
-  const modelStr = AvailableModels[model as AvailableModel];
-  if (!modelStr) return null;
-  if (modelStr.startsWith('gpt')) {
-    return fromModelName(modelStr);
-  } else if (modelStr.startsWith('dall')) {
+  if (!availableModels.includes(model as AvailableModels)) return null;
+  if (model.startsWith('gpt')) {
+    return fromModelName(model);
+  } else if (model.startsWith('dall')) {
     // dalle don't need to calc the token
     return null;
   } else {
diff --git a/packages/backend/server/src/schema.gql b/packages/backend/server/src/schema.gql
index f9b8da63a4..cc26a936a4 100644
--- a/packages/backend/server/src/schema.gql
+++ b/packages/backend/server/src/schema.gql
@@ -262,12 +262,12 @@ enum CopilotModels {
   Gpt4OmniMini0718
   Gpt41
   Gpt41Mini
+  Gpt41Nano
   Gpt410414
+  GptImage
   TextEmbedding3Large
   TextEmbedding3Small
   TextEmbeddingAda002
-  TextModerationLatest
-  TextModerationStable
 }
 
 input CopilotPromptConfigInput {
diff --git a/packages/common/graphql/src/schema.ts b/packages/common/graphql/src/schema.ts
index ccebb1b72d..7f891fb1eb 100644
--- a/packages/common/graphql/src/schema.ts
+++ b/packages/common/graphql/src/schema.ts
@@ -356,12 +356,12 @@ export enum CopilotModels {
   Gpt4OmniMini0718 = 'Gpt4OmniMini0718',
   Gpt41 = 'Gpt41',
   Gpt41Mini = 'Gpt41Mini',
+  Gpt41Nano = 'Gpt41Nano',
   Gpt410414 = 'Gpt410414',
+  GptImage = 'GptImage',
   TextEmbedding3Large = 'TextEmbedding3Large',
   TextEmbedding3Small = 'TextEmbedding3Small',
   TextEmbeddingAda002 = 'TextEmbeddingAda002',
-  TextModerationLatest = 'TextModerationLatest',
-  TextModerationStable = 'TextModerationStable',
 }
 
 export interface CopilotPromptConfigInput {