feat: add Opus [1M] model option to model selector

[gumab]

Summary

• Adds opus[1m] to CLAUDE_MODELS.OPTIONS in shared/modelConstants.js, alongside the existing sonnet[1m] entry
• Allows users to select the Opus model with 1M context window from the UI model picker

Closes #579

Test plan

• Verify Opus [1M] appears in the model selector dropdown
• Verify selecting Opus [1M] correctly passes opus[1m] to the Claude SDK
• Verify existing model options still work as expected

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features

  • Added Claude Opus [1M] as a selectable model option in the model selection interface.

• Documentation

  • Updated model-listing documentation and API docs to include the new Opus [1M] model option.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 0fd1ea4e-d6ba-453d-979e-dc45848ee664

📥 Commits

Reviewing files that changed from the base of the PR and between 44bdea5 and 3938daf.

📒 Files selected for processing (3)

• server/claude-sdk.js
• server/routes/agent.js
• shared/modelConstants.js

✅ Files skipped from review due to trivial changes (3)

• server/routes/agent.js
• server/claude-sdk.js
• shared/modelConstants.js

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📝 Walkthrough

Walkthrough

Added a new Claude model option "opus[1m]" (label "Opus [1M]") to the model options and updated related inline documentation to list it as a supported model. No runtime logic or validation was changed.

Changes

Cohort / File(s)	Summary
Model Options shared/modelConstants.js	Inserted { value: "opus[1m]", label: "Opus [1M]" } into CLAUDE_MODELS.OPTIONS.
SDK Mapping Docs server/claude-sdk.js	Updated comment/documentation in mapCliOptionsToSDK() to include opus[1m] as a valid sdkOptions.model value; no functional change.
API Docs server/routes/agent.js	Updated inline API documentation for the model parameter to list opus[1m] among supported Claude model values; no functional change.

Poem

🐰
A tiny hop, a new choice found,
Opus 1M — now in the mound.
Tokens plenty, long and wide,
I nibble data with rabbit pride.
Hooray for models, one more to confide!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: adding an Opus [1M] model option to the model selector dropdown.
Linked Issues check	✅ Passed	The pull request successfully implements all coding requirements from issue #579: adds opus[1m] entry to CLAUDE_MODELS.OPTIONS, updates model documentation in server files, and enables UI selection of Opus with 1M context.
Out of Scope Changes check	✅ Passed	All changes are directly aligned with issue #579 objectives. The modifications to shared/modelConstants.js, server/claude-sdk.js, and server/routes/agent.js are all necessary to expose the Opus [1M] option in the UI.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@shared/modelConstants.js`:
- Line 21: The server-side "valid models" documentation and validation must be
updated to include the new opus[1m] model; locate the server-side places that
enumerate or comment valid models (search for constants or arrays like
VALID_MODELS / SUPPORTED_MODELS or functions named validateModel,
getSupportedModels, or model-checking middleware and the inline "valid models"
comment blocks) and add the opus[1m] entry (or its string "opus[1m]") to those
lists/comments and ensure any validation logic that filters/accepts models
recognizes the new string so runtime validation and docs stay in sync.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: d3bfbfa5-4f66-4e6b-8420-e54e4ffef880

📥 Commits

Reviewing files that changed from the base of the PR and between 1628868 and 44bdea5.

📒 Files selected for processing (1)

• shared/modelConstants.js

[viper151]

Completed