There are four distinct ways to reach Claude Opus 5, and they suit very different people. Picking wrong is the most common reason someone concludes the model is expensive or awkward when it is neither.
1. The Claude apps (easiest)
Sign in at claude.ai on web, desktop, or mobile and choose the model from the picker. This is a flat-rate subscription rather than per-token billing, which is the right shape for individuals and most day-to-day work.
Which models appear in the picker depends on your plan and changes over time, so check the app rather than trusting a blog post — including this one.
2. Claude Code (for developers)
Claude Code is Anthropic's coding agent, available as a CLI, a desktop app for Mac and Windows, a web app, and extensions for VS Code and JetBrains. It is the route that takes fullest advantage of Opus 5's agentic strengths, because it can read your repository, run commands, and iterate.
It also exposes fast mode directly — the /fast toggle switches Opus 5 to higher output speed at premium pricing.
3. The Claude API (for building)
Use the model ID claude-opus-5 against the Messages API. This is where you get the full parameter surface: effort levels, adaptive thinking, prompt caching, batch processing, and the server-side tools.
Note two Opus 5 specifics before you ship: Priority Tier does not cover this model, and it draws on its own rate-limit bucket separate from the Opus 4.x pool.
4. Cloud platforms (for enterprises)
| Platform | Model ID |
|---|---|
| Amazon Bedrock | anthropic.claude-opus-5 |
| Google Cloud Vertex AI | claude-opus-5 |
| Microsoft Foundry | claude-opus-5 |
The cloud routes matter when data residency, existing committed spend, or procurement rules decide the question. Feature coverage varies by platform — fast mode, for instance, is available on the Claude API only.
Which route should you pick?
- Just want to use it? The Claude apps.
- Writing code? Claude Code, and let it read the repository.
- Building a product? The Claude API.
- Enterprise procurement or data residency rules? Whichever cloud you already buy from.
More on Claude Opus 5
Start with the complete Claude Opus 5 guide for the overview, or go deeper:
Ready to go deeper?
Read the full Claude Opus 5 guideFrequently Asked Questions
Is Claude Opus 5 free?
There is no free per-token access. The Claude apps offer a free tier, but which models it includes changes over time — check the model picker in the app. API access is pay-as-you-go at $5 per million input tokens and $25 per million output.
Do I need an API key to use Claude Opus 5?
Only for API and Claude Code usage. The Claude web, desktop, and mobile apps work with a normal account and subscription. If you are running it on Amazon Bedrock, Google Cloud Vertex AI, or Microsoft Foundry, you authenticate through that platform instead.
Can I use Claude Opus 5 in my IDE?
Yes — Claude Code ships extensions for VS Code and JetBrains alongside its CLI, desktop, and web apps. Third-party editors such as Cursor also support Claude models directly.
