diff --git a/README.md b/README.md
index 71ad0425..7321adb5 100644
--- a/README.md
+++ b/README.md
@@ -69,7 +69,7 @@ jobs:
           auto_improve: true
           enable_auto_approval: true
           model: 'anthropic/claude-sonnet-4-20250514'
-          max_model_tokens: '100000'
+          max_model_tokens: '1000000'
           require_trigger: false
 ```
 
@@ -101,7 +101,7 @@ jobs:
 | `auto_improve` | Enable code improvement suggestions | ❌ No | `true` |
 | `enable_auto_approval` | Enable automatic approval of safe changes | ❌ No | `false` |
 | `model` | AI model to use | ❌ No | `anthropic/claude-sonnet-4-20250514` |
-| `max_model_tokens` | Maximum tokens for AI model | ❌ No | `100000` |
+| `max_model_tokens` | Maximum tokens for AI model | ❌ No | `1000000` |
 | `require_trigger` | Require ##prbot trigger in PR description | ❌ No | `false` |
 
 ## 📤 Outputs
@@ -121,7 +121,7 @@ Create `.pr_bot.toml`:
 [config]
 model = "anthropic/claude-sonnet-4-20250514"
 enable_auto_approval = true
-max_model_tokens = 100000
+max_model_tokens = 1000000
 use_cursor_rules = true  # Enable Cursor rules (default: true)
 
 [github_action_config]
diff --git a/action.yaml b/action.yaml
index 27fd6765..1645f9f3 100644
--- a/action.yaml
+++ b/action.yaml
@@ -33,7 +33,7 @@ inputs:
   max_model_tokens:
     description: 'Maximum tokens for AI model'
     required: false
-    default: '100000'
+    default: '1000000'
   require_trigger:
     description: 'Require ##prbot trigger in PR description'
     required: false
diff --git a/pr_agent/algo/__init__.py b/pr_agent/algo/__init__.py
index 213c482d..7cb13517 100644
--- a/pr_agent/algo/__init__.py
+++ b/pr_agent/algo/__init__.py
@@ -75,7 +75,7 @@
     'anthropic.claude-v2': 100000,
     'anthropic/claude-3-opus-20240229': 100000,
     'anthropic/claude-opus-4-20250514': 200000,  # Claude Opus 4
-    'anthropic/claude-sonnet-4-20250514': 200000,  # Claude Sonnet 4
+    'anthropic/claude-sonnet-4-20250514': 1000000,  # Claude Sonnet 4 — 1M context (Anthropic API)
     'anthropic/claude-3-5-sonnet-20240620': 100000,
     'anthropic/claude-3-5-sonnet-20241022': 100000,
     'anthropic/claude-3-7-sonnet-20250219': 200000,
diff --git a/pr_agent/settings/configuration.toml b/pr_agent/settings/configuration.toml
index 4c4a63b5..feee7b73 100644
--- a/pr_agent/settings/configuration.toml
+++ b/pr_agent/settings/configuration.toml
@@ -32,7 +32,7 @@ response_language="en-US" # Language locales code for PR responses in ISO 3166 a
 # token limits
 max_description_tokens = 500
 max_commits_tokens = 500
-max_model_tokens = 175000 # Global cap to align with desired headroom under 200K models
+max_model_tokens = 1000000 # Global cap to enable Claude Sonnet 4 long context (1M)
 custom_model_max_tokens=-1 # for models not in the default list
 model_token_count_estimate_factor=0.3 # factor to increase the token count estimate, in order to reduce likelihood of model failure due to too many tokens - applicable only when requesting an accurate estimate.
 # patch extension logic