Add Claude Opus 4.5, Opus 4.6, and Sonnet 4.6 to model catalogue

[manueltarouca]

Summary

• Adds three new Anthropic models to the model selector: Claude 4.5 Opus, Claude 4.6 Opus, and Claude 4.6 Sonnet
• All three use the Anthropic provider directly (no Bedrock fallback), do not require a user API key, and share the same 24576 max token output limit as existing Claude 4.x models
• Includes eval configs for all three new models in the test-kitchen

Test plan

• pnpm run typecheck passes (exhaustive never checks confirm all switch/map sites are covered)
• pnpm run lint:app passes
• pnpm run test passes (108/108 tests)
• Verify new models appear in the model selector dropdown
• Verify selecting each new model sends the correct modelChoice slug to the backend

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[Copilot]

Pull request overview

Adds three new Anthropic Claude models to the app’s model catalogue / selector and wires them through to backend model slugs, plus adds corresponding eval entries in the test-kitchen.

Changes:

• Extend ModelSelection and the model selector catalogue to include Claude 4.5 Opus, Claude 4.6 Opus, and Claude 4.6 Sonnet.
• Map the new UI selections to Anthropic provider + correct modelChoice slugs in chat request construction.
• Update Anthropic max-token logic for the new modelChoice slugs and add Braintrust eval configs for them.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test-kitchen/initialGeneration.eval.ts	Adds eval runs for the three new Anthropic model slugs.
app/utils/constants.ts	Extends the ModelSelection union with the new Claude variants.
app/lib/common/apiKey.ts	Includes the new model selections in the Anthropic API-key presence check.
app/lib/.server/llm/provider.ts	Extends anthropicMaxTokens to treat the new modelChoice slugs as 24,576 max output tokens.
app/components/chat/ModelSelector.tsx	Adds the three new models to the selector catalogue with provider: 'anthropic'.
app/components/chat/Chat.tsx	Maps new model selections to the intended Anthropic modelChoice slugs and provider.

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[Copilot]

The new model selections set modelChoice to values like claude-opus-4-5 / claude-opus-4-6 / claude-sonnet-4-6. The server chat action currently treats any modelChoice other than claude-sonnet-4-0, claude-sonnet-4-5, or gpt-5 as requiring a user API key and will return a 402 missing-api-key when none is set. As a result, these new models will fail for users without API keys despite requireKey: false. Update the backend allowlist (and the modelChoice passthrough logic) to include these new Claude modelChoice slugs so they can use the default Anthropic key as intended.

Suggested change

	modelChoice = 'claude-opus-4-5';
	} else if (modelSelection === 'claude-4.6-opus') {
	modelProvider = 'Anthropic';
	modelChoice = 'claude-opus-4-6';
	} else if (modelSelection === 'claude-4.6-sonnet') {
	modelProvider = 'Anthropic';
	modelChoice = 'claude-sonnet-4-6';
	// Use an allowlisted Anthropic modelChoice so the default key can be used.
	modelChoice = 'claude-sonnet-4-5';
	} else if (modelSelection === 'claude-4.6-opus') {
	modelProvider = 'Anthropic';
	// Use an allowlisted Anthropic modelChoice so the default key can be used.
	modelChoice = 'claude-sonnet-4-5';
	} else if (modelSelection === 'claude-4.6-sonnet') {
	modelProvider = 'Anthropic';
	// Use an allowlisted Anthropic modelChoice so the default key can be used.
	modelChoice = 'claude-sonnet-4-5';