adding support for new claude 4.5 sonnet agent model

[Kylejeong2]

why

anthropic released a new sota computer use model

what changed

added claude-sonnet-4-5-20250929 as a model to the list

test plan

ran evals

[changeset-bot]

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Latest commit: 212806a

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[greptile-apps]

Greptile Overview

Summary

Added support for Anthropic's new Claude 4.5 Sonnet model (claude-sonnet-4-5-20250929) by adding it to the agent provider mapping. This enables the new SOTA computer use model to be used with Stagehand's agent functionality.

Key Changes:

• Added claude-sonnet-4-5-20250929 to modelToAgentProviderMap in AgentProvider.ts
• Removed some empty lines in CHANGELOG.md for formatting consistency

Recommendations:

• Add changelog entry documenting the new model support
• Update example comments and evaluation configurations to include the new model

Confidence Score: 4/5

• This PR is safe to merge with minimal risk
• Simple model addition with proper provider mapping. Only minor documentation improvements needed.
• No files require special attention

Important Files Changed

File Analysis

Filename	Score	Overview
lib/agent/AgentProvider.ts	5/5	Added new Claude 4.5 Sonnet model to the provider mapping - simple and safe change
CHANGELOG.md	4/5	Only formatting changes (removed empty lines), missing changelog entry for new model

Sequence Diagram

sequenceDiagram
    participant Client
    participant AgentProvider
    participant ModelMap as modelToAgentProviderMap
    participant AnthropicCUA as AnthropicCUAClient

    Client->>AgentProvider: getClient("claude-sonnet-4-5-20250929")
    AgentProvider->>ModelMap: lookup model name
    ModelMap-->>AgentProvider: "anthropic" provider
    AgentProvider->>AnthropicCUA: new AnthropicCUAClient("anthropic", "claude-sonnet-4-5-20250929")
    AnthropicCUA-->>AgentProvider: client instance
    AgentProvider-->>Client: configured agent client

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