improvement(agent): switch default model to claude 4.5 sonnet

[Sg312]

Summary

Switches default model for agent block to claude 4.5 sonnet

Type of Change

• Other: change

Testing

Manual

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
docs	Skipped			Dec 2, 2025 0:45am

[greptile-apps]

Greptile Overview

Greptile Summary

This PR switches the default AI model from gpt-4o to claude-sonnet-4-5 across the agent configuration system. The change updates:

• Default model constant in executor configuration
• Agent block's model defaultValue and fallback
• ComboBox component's model selection logic and comments
• Default parameter values: temperature (0.5→0.3), frequency penalty (1→0.3), reasoning effort (medium→low), and verbosity (medium→low) to better align with Claude's optimal settings

Confidence Score: 5/5

• This PR is safe to merge with no issues found
• All changes are straightforward configuration updates that swap model identifiers and adjust default parameters. The model claude-sonnet-4-5 exists in the provider definitions and supports temperature (max: 1), making the new 0.3 default valid. No logic changes or potential runtime errors introduced.
• No files require special attention

Important Files Changed

File Analysis

Filename	Score	Overview
apps/sim/executor/consts.ts	5/5	Changed default model from gpt-4o to claude-sonnet-4-5 in AGENT constants
apps/sim/blocks/blocks/agent.ts	5/5	Updated default model to claude-sonnet-4-5, added explicit defaultValue, and adjusted temperature/frequency penalty defaults from 0.5/1 to 0.3/0.3, reasoning effort and verbosity from medium to low
apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/panel/components/editor/components/sub-block/components/combobox/combobox.tsx	5/5	Updated default model constant and comments from gpt-4o to claude-sonnet-4-5, renamed variable from gpt4o to claudeSonnet45

Sequence Diagram

sequenceDiagram
    participant User
    participant ComboBox
    participant AgentBlock
    participant Executor
    participant Provider
    
    Note over ComboBox,Provider: Model Selection & Configuration Flow
    
    User->>ComboBox: Open Agent Block
    ComboBox->>ComboBox: Check DEFAULT_MODEL constant
    Note right of ComboBox: Now: claude-sonnet-4-5<br/>(was: gpt-4o)
    ComboBox->>ComboBox: Find claude-sonnet-4-5 in options
    ComboBox->>AgentBlock: Set defaultValue
    
    User->>AgentBlock: Configure Agent
    AgentBlock->>AgentBlock: Apply default values
    Note right of AgentBlock: temperature: 0.3<br/>frequency_penalty: 0.3<br/>reasoningEffort: low<br/>verbosity: low
    
    User->>AgentBlock: Execute Agent
    AgentBlock->>Executor: Send model config
    Executor->>Executor: Check model param
    Note right of Executor: Fallback to AGENT.DEFAULT_MODEL<br/>claude-sonnet-4-5
    
    Executor->>Provider: Request with claude-sonnet-4-5
    Provider->>Provider: Validate model exists
    Note right of Provider: Model found in<br/>anthropic provider
    Provider-->>Executor: Response
    Executor-->>AgentBlock: Agent output
    AgentBlock-->>User: Result

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[greptile-apps]

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