diff --git a/.github/workflows/integration-runner.yml b/.github/workflows/integration-runner.yml
index 63cb881303..f2d2e45561 100644
--- a/.github/workflows/integration-runner.yml
+++ b/.github/workflows/integration-runner.yml
@@ -22,7 +22,7 @@ on:
             model_ids:
                 description: >-
                     Comma-separated model IDs to test (from resolve_model_config.py).
-                    Example: claude-sonnet-4-5-20250929,glm-4.7. Defaults to a standard set.
+                    Example: claude-sonnet-4-6,glm-4.7. Defaults to a standard set.
                 required: false
                 default: ''
                 type: string
@@ -50,7 +50,7 @@ on:
 env:
     N_PROCESSES: 4 # Global configuration for number of parallel processes for evaluation
     # Default models for scheduled/label-triggered runs (subset of models from resolve_model_config.py)
-    DEFAULT_MODEL_IDS: claude-sonnet-4-5-20250929,deepseek-v3.2-reasoner,kimi-k2-thinking,gemini-3-pro
+    DEFAULT_MODEL_IDS: claude-sonnet-4-6,deepseek-v3.2-reasoner,kimi-k2-thinking,gemini-3-pro
 
 jobs:
     setup-matrix:
@@ -215,7 +215,7 @@ jobs:
                 (github.event_name == 'schedule' && github.repository == 'OpenHands/software-agent-sdk')
             ) && needs.setup-matrix.result == 'success'
         needs: [setup-matrix, post-label-comment, post-dispatch-comment]
-        runs-on: ubuntu-22.04
+        runs-on: blacksmith-4vcpu-ubuntu-2204
         permissions:
             contents: read
             id-token: write
@@ -367,7 +367,7 @@ jobs:
                 github.event_name == 'workflow_dispatch' ||
                 (github.event_name == 'schedule' && github.repository == 'OpenHands/software-agent-sdk')
             )
-        runs-on: ubuntu-24.04
+        runs-on: blacksmith-2vcpu-ubuntu-2404
         permissions:
             contents: read
             pull-requests: write
diff --git a/openhands-sdk/openhands/sdk/llm/utils/model_features.py b/openhands-sdk/openhands/sdk/llm/utils/model_features.py
index d454f5aa88..3f16b9c8ab 100644
--- a/openhands-sdk/openhands/sdk/llm/utils/model_features.py
+++ b/openhands-sdk/openhands/sdk/llm/utils/model_features.py
@@ -71,6 +71,7 @@ class ModelFeatures:
     # Anthropic Opus 4.5 and 4.6
     "claude-opus-4-5",
     "claude-opus-4-6",
+    "claude-sonnet-4-6",
     # Nova 2 Lite
     "nova-2-lite",
 ]
@@ -96,6 +97,7 @@ class ModelFeatures:
     "claude-haiku-4-5",
     "claude-opus-4-5",
     "claude-opus-4-6",
+    "claude-sonnet-4-6",
 ]
 
 # Models that support a top-level prompt_cache_retention parameter