add support for claude sonnet 4.5 (#3692)

.env.example

@@ -13,7 +13,7 @@ OPENAI_API_KEY=""
 
 # ENABLE_ANTHROPIC: Set to true to enable Anthropic as a language model provider.
 ENABLE_ANTHROPIC=false
-# ANTHROPIC_API_KEY: Your Anthropic API key for accessing models like Claude-3.
+# ANTHROPIC_API_KEY: Your Anthropic API key for accessing models like Claude-3, Claude-4, and Claude-4.5.
 ANTHROPIC_API_KEY=""
 
 # ENABLE_AZURE: Set to true to enable Azure as a language model provider.
@@ -70,8 +70,9 @@ VOLCENGINE_API_KEY=""
 VOLCENGINE_API_BASE="https://ark.cn-beijing.volces.com/api/v3"
 
 # LLM_KEY: The chosen language model to use. This should be one of the models
-# provided by the enabled LLM providers (e.g., OPENAI_GPT5, OPENAI_GPT5_MINI, OPENAI_GPT5_NANO, 
-# AZURE_OPENAI_GPT5, AZURE_OPENAI_GPT5_MINI, AZURE_OPENAI_GPT5_NANO, OPENAI_GPT4_TURBO, 
+# provided by the enabled LLM providers (e.g., OPENAI_GPT5, OPENAI_GPT5_MINI, OPENAI_GPT5_NANO,
+# AZURE_OPENAI_GPT5, AZURE_OPENAI_GPT5_MINI, AZURE_OPENAI_GPT5_NANO, ANTHROPIC_CLAUDE4.5_SONNET,
+# ANTHROPIC_CLAUDE4_SONNET, ANTHROPIC_CLAUDE3.7_SONNET, OPENAI_GPT4_TURBO,
 # OPENAI_GPT4V, ANTHROPIC_CLAUDE3, AZURE_OPENAI_GPT4V).
 LLM_KEY=""
 # a cheaper LLM providers to help finishing some small tasks, like custom selection or svg conversion. If empty, it will be the same as LLM_KEY

skyvern/cli/llm_setup.py

@@ -99,6 +99,7 @@ def setup_llm_providers() -> None:
                     "ANTHROPIC_CLAUDE3.5_HAIKU",
                     "ANTHROPIC_CLAUDE4_OPUS",
                     "ANTHROPIC_CLAUDE4_SONNET",
+                    "ANTHROPIC_CLAUDE4.5_SONNET",
                 ]
             )
     else:

skyvern/forge/sdk/api/llm/config_registry.py

@@ -321,6 +321,16 @@ if settings.ENABLE_ANTHROPIC:
             max_completion_tokens=64000,
         ),
     )
+    LLMConfigRegistry.register_config(
+        "ANTHROPIC_CLAUDE4.5_SONNET",
+        LLMConfig(
+            "anthropic/claude-sonnet-4-5-20250929",
+            ["ANTHROPIC_API_KEY"],
+            supports_vision=True,
+            add_assistant_prefix=True,
+            max_completion_tokens=64000,
+        ),
+    )
 
 if settings.ENABLE_BEDROCK:
     # Supported through AWS IAM authentication