Add Haiku 4.5 computer use support

[miguelg719]

why

New model dropped

what changed

Added support for haiku 4.5

test plan

[changeset-bot]

🦋 Changeset detected

Latest commit: 52daea0

The changes in this PR will be included in the next version bump.

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[greptile-apps]

Greptile Overview

Summary

Added support for Anthropic's new Claude Haiku 4.5 model (claude-haiku-4-5-20251001) by registering it in the agent provider mapping. The model is correctly mapped to the anthropic provider type, allowing it to be used with the existing AnthropicCUAClient.

• Added claude-haiku-4-5-20251001 to modelToAgentProviderMap in lib/agent/AgentProvider.ts:18
• Included proper changeset for version bump documentation
• Issue: stagehand.config.ts contains an unrelated change (default model switched from gpt-4o to openai/gpt-4.1-mini) that should be reverted

Confidence Score: 2/5

• This PR should not be merged until the unrelated config change is reverted
• The core change (adding Haiku 4.5 support) is correct and safe, but the PR includes an unrelated modification to the default model in the config file that changes production behavior and should be removed
• stagehand.config.ts needs the unrelated model change reverted before merge

Important Files Changed

File Analysis

Filename	Score	Overview
.changeset/gentle-beds-enjoy.md	5/5	Properly formatted changeset documenting the patch version bump for Haiku 4.5 support
lib/agent/AgentProvider.ts	5/5	Added claude-haiku-4-5-20251001 to the model mapping for Anthropic provider
stagehand.config.ts	0/5	Contains unrelated change to default model (gpt-4o → openai/gpt-4.1-mini) that shouldn't be in this PR

Sequence Diagram

sequenceDiagram
    participant User
    participant AgentProvider
    participant modelToAgentProviderMap
    participant AnthropicCUAClient

    User->>AgentProvider: getClient("claude-haiku-4-5-20251001", options)
    AgentProvider->>AgentProvider: getAgentProvider(modelName)
    AgentProvider->>modelToAgentProviderMap: lookup "claude-haiku-4-5-20251001"
    modelToAgentProviderMap-->>AgentProvider: return "anthropic"
    AgentProvider->>AnthropicCUAClient: new AnthropicCUAClient("anthropic", "claude-haiku-4-5-20251001", ...)
    AnthropicCUAClient-->>AgentProvider: client instance
    AgentProvider-->>User: return AnthropicCUAClient

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[greptile-apps]

logic: unrelated change - reverting default model from gpt-4o to openai/gpt-4.1-mini shouldn't be part of this PR

Suggested change

	modelName: "openai/gpt-4.1-mini" /* Name of the model to use */,
	modelName: "gpt-4o" /* Name of the model to use */,

Prompt To Fix With AI

This is a comment left during a code review.
Path: stagehand.config.ts
Line: 10:10

Comment:
**logic:** unrelated change - reverting default model from `gpt-4o` to `openai/gpt-4.1-mini` shouldn't be part of this PR

```suggestion
  modelName: "gpt-4o" /* Name of the model to use */,
```

How can I resolve this? If you propose a fix, please make it concise.