Migrate to claude 4

[hyiip]

💻 变更类型 | Change Type

• feat
• fix
• refactor
• perf
• style
• test
• docs
• ci
• chore
• build

🔀 变更说明 | Description of Change

Add support to claude 4 model. In the migration guide [1,2], handling stop_reason is required. Therefore, an addition change

          if (chunkJson?.delta?.stop_reason === "refusal") {
            // Return a message to display to the user
            const refusalMessage = "\n\n[Assistant refused to respond. Please modify your request and try again.]";
            options.onError?.(new Error("Content policy violation: " + refusalMessage));
            return refusalMessage;
          }

is added in app/clients/platforms/anthropics.ts to give refusal message when we detected the stop_reason.

📝 补充信息 | Additional Information

Summary by CodeRabbit

• New Features

  • Added support for new models: Claude Sonnet 4 (20250514) and Claude Opus 4 (20250514).

• Bug Fixes

  • Improved handling of assistant refusal responses by displaying a content policy violation message to the user when applicable.

[coderabbitai]

Walkthrough

The changes update the streaming response handler for Anthropic API responses to recognize new chunk types and handle content policy refusals by triggering an error callback. Additionally, two new Anthropic model identifiers are added to the internal model constants array.

Changes

File(s)	Change Summary
app/client/platforms/anthropic.ts	Extended streaming chunk type handling; detects and reports content policy refusals in responses.
app/constant.ts	Added two new Anthropic model identifiers to the internal model array.

Possibly related PRs

• add constant to claude 3.5 sonnet 20241022 #5737: Adds a new model constant in app/constant.ts, which is related by the addition of model identifiers but not by response handling logic.

Suggested reviewers

• Dogtiti

Poem

A bunny hops through code so bright,
New models join the Anthropic flight.
If the bot must gently refuse,
Now users get the latest news.
With every hop and every check,
The platform’s stronger—what the heck!
🐇✨

Warning

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🔧 ESLint

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app/constant.ts

Oops! Something went wrong! :(

ESLint: 8.49.0

TypeError: Cannot read properties of undefined (reading 'loc')
Occurred while linting /app/constant.ts:1
Rule: "unused-imports/no-unused-imports"
at normalizeReportLoc (/node_modules/eslint-rule-composer/lib/rule-composer.js:47:26)
at normalizeReport (/node_modules/eslint-rule-composer/lib/rule-composer.js:107:12)
at Object.value [as report] (/node_modules/eslint-rule-composer/lib/rule-composer.js:143:72)
at Program:exit (/node_modules/eslint/lib/rules/no-unused-vars.js:694:33)
at ruleErrorHandler (/node_modules/eslint/lib/linter/linter.js:1051:28)
at /node_modules/eslint/lib/linter/safe-emitter.js:45:58
at Array.forEach ()
at Object.emit (/node_modules/eslint/lib/linter/safe-emitter.js:45:38)
at NodeEventGenerator.applySelector (/node_modules/eslint/lib/linter/node-event-generator.js:297:26)
at NodeEventGenerator.applySelectors (/node_modules/eslint/lib/linter/node-event-generator.js:326:22)

---

📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 814fd27 and 21d39b8.

📒 Files selected for processing (2)

• app/client/platforms/anthropic.ts (2 hunks)
• app/constant.ts (1 hunks)

🔇 Additional comments (4)

app/constant.ts (1)

574-575: Official Claude 4 model identifiers confirmed

The two entries added in app/constants.ts (lines 574–575):

• claude-sonnet-4-20250514
• claude-opus-4-20250514

match Anthropic’s documented API names for Claude 4. No further changes required.

app/client/platforms/anthropic.ts (3)

237-237: Proper addition of stop_reason field.

Adding the optional stop_reason field to the delta object is correct for handling Claude 4 refusal scenarios.

---

243-249: Well-implemented refusal handling logic.

The refusal detection and error handling implementation is correct and follows the Claude 4 migration guidelines. The code properly:

• Detects the "refusal" stop reason
• Triggers the error callback with a descriptive message
• Returns a user-friendly refusal message

This ensures users receive clear feedback when Claude refuses to respond due to policy constraints.

---

227-227: Validated new chunk types

The added "message_delta" and "message_stop" members correctly match Anthropic’s Claude 4 SSE event types. No further changes required.

✨ Finishing Touches

• 📝 Generate Docstrings

---

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