default is opus and auto switches to sonnet when you run out of "opus quota", which usually is pretty bad. Answer from InvestigatorKey7553 on reddit.com
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Apidog
apidog.com › blog › opus-4-5-claude-integration
How to use Claude 4.5 Opus with Cursor and Claude Code
1 month ago - By using Claude Opus 4.5, both Cursor and Claude Code can benefit from its deeper reasoning and memory — but which tool you choose depends on your workflow preferences. Switch models thoughtfully — Because Opus is powerful but more expensive, switch only when you need its reasoning strengths. Use planning mode in Claude Code — Have the agent plan out multi-step tasks before executing.
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Claude
support.claude.com › en › articles › 11940350-claude-code-model-configuration
Claude Code Model Configuration | Claude Help Center
Use the --model flag when starting Claude Code. Start a fresh Terminal session. Enter the following commands (depending on the model you’d like to use for that session): For Opus 4.5: claude --model claude-opus-4-5-20251101
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Vps-commander
vps-commander.com › blog › claude-opus-4-5-setup-2025
How to Set Up Claude Opus 4.5 & Claude Code - Step-by-Step Guide 2025
Please think deeply about edge cases before writing code." Watch the Thinking Blocks: Opus 4.5 will preserve its reasoning context. You can see it planning, checking files, and self-correcting. Approve Changes: Claude will present a diff. Press Enter to apply or R to reject/refine. Opus 4.5 has enhanced "Computer Use" capabilities. It can now inspect ...
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DataCamp
datacamp.com › tutorial › claude-opus-4-claude-code
Claude Opus 4 with Claude Code: A Guide With Demo Project | DataCamp
May 23, 2025 - Claude Opus 4 has generated a detailed README.md file, including a project description, objectives, and implementation steps. Using the README file as a guide, we will ask Claude to create the folder structure, files, and initial codebase. Prompt: “Now, create folders and files and build ...
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Claude
support.claude.com › en › articles › 12920969-applying-claude-opus-4-5-s-strengths-to-your-everyday-work
Applying Claude Opus 4.5’s strengths to your everyday work | Claude Help Center
Opus 4.5 picks up visual details that matter. Some projects unfold over many messages. You research, then analyze, then draft, then revise—each phase building on what came before. Previously, long conversations would hit context limits, forcing you to start over in a new chat or re-explain everything Claude should already know.
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CometAPI
cometapi.com › how-to-use-claude-opus-4-5-via-cursor-and-claude-code
How to use Claude Opus 4.5 with Cursor and Claude Code — a in-depth guide - CometAPI - All AI Models in One API
2 weeks ago - Anthropic’s Claude Opus 4.5 is the company’s newest flagship model focused on coding, agentic workflows, and advanced “computer use.” This article explains what Opus 4.5 is, how it performs on public benchmarks, and — step by step — how to use it inside two developer-focused surfaces: Cursor (an AI-powered IDE) and Claude Code (Anthropic’s command-line agentic coding tool).
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Reddit
reddit.com › r/claudeai › claude opus 4.5 is now available in claude code for pro users
r/ClaudeAI on Reddit: Claude Opus 4.5 is now available in Claude Code for Pro users
3 weeks ago -

Claude Opus 4.5, our frontier coding model, is now available in Claude Code for Pro users. Pro users can select Opus 4.5 using the /model command in their terminal.

Opus 4.5 will consume rate limits faster than Sonnet 4.5. We recommend using Opus for your most complex tasks and using Sonnet for simpler tasks.

To get started:

* Run claude update
* /model opus

Find elsewhere
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Anthropic
anthropic.com › claude › opus
Claude Opus 4.5
Claude Opus 4 pushes the frontier in coding, agentic search, and creative writing. We’ve also made it possible to run Claude Code in the background, enabling developers to assign long-running coding tasks for Opus to handle independently.
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The New Stack
thenewstack.io › home › claude opus 4 with claude code: a developer walkthrough
Claude Opus 4 With Claude Code: A Developer Walkthrough - The New Stack
May 31, 2025 - Claude Opus 4 has already grabbed quite a bit of attention in the short time it has been public, and in some ways I feel I’m a little slow to the party. I was reading a very detailed breakdown that Federico Viticci did using Claude 4 on the web to sort through his emails. I know he likes detail, but I was slightly worried about the 200-line prompt file he was maintaining. (I later understood that Claude writes a lot of notes into its own file.)
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Reddit
reddit.com › r/claudeai › claude code just updated, using claude opus 4
r/ClaudeAI on Reddit: Claude Code just updated, using Claude Opus 4
March 28, 2025 - How do I get Opus 4? ... Opus through Claude code is not available for Max users (at least it’s not through the 5x plan). It is only available through the API usage. You can easily verify this by typing /model and seeing the options.
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Claude
support.claude.com › en › articles › 11145838-using-claude-code-with-your-pro-or-max-plan
Using Claude Code with your Pro or Max plan | Claude Help Center
Model access: Max plan subscribers can use Sonnet or Opus 4.5 on Claude Code (switch between them using the /model command). Best for: Everyday use with larger codebases, or power users.
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Mckaywrigley
mckaywrigley.com › posts › opus-4.5
My Thoughts on Claude Opus 4.5
A useful starting point is to have a chatroom.md file that a team of agents can use to communicate and collaborate in. If you really want to get crazy with swarms, then you'll find hooks in the Claude Agent SDK to be essential. Claude Code + Opus 4.5 is the best AI coding tool in the world.
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GitHub
github.blog › home › changelogs › claude opus 4.5 is in public preview for github copilot
Claude Opus 4.5 is in public preview for GitHub Copilot - GitHub Changelog
November 24, 2025 - Pro & Pro+ plans: For users in VS Code, select the model in the model picker and confirm the one-time prompt. To explore all models available in GitHub Copilot, see our documentation on models and get started with Copilot.
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Anthropic
anthropic.com › news › claude-opus-4-5
Introducing Claude Opus 4.5
Early testing shows it surpasses internal coding benchmarks while cutting token usage in half, and is especially well-suited for tasks like code migration and code refactoring. Claude Opus 4.5 beats Sonnet 4.5 and competition on our internal benchmarks, using fewer tokens to solve the same problems.
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Medium
medium.com › coding-nexus › how-to-run-claude-code-with-opus-4-5-at-maximum-power-525cdc1c470e
How to Run Claude Code with Opus 4.5 at Maximum Power | by Code Coup | Coding Nexus | Dec, 2025 | Medium
1 week ago - How to Run Claude Code with Opus 4.5 at Maximum Power I’ve learned one thing: most “performance tips” online are vague, half-tested, or misunderstood. This one is different. If you’re using …