How to Use Claude Opus 4.7 in the Anthropic API

To use Claude Opus 4.7 in the Anthropic API, send a Messages API request with model: "claude-opus-4-7". Anthropic's current models overview confirms that model name, and the Claude Opus product page confirms Anthropic is treating it as the premium generally available flagship for the hardest coding, agent, and document workflows.

Model name, pricing, and limits

The launch-day basics are now documented in Anthropic's current models overview. Anthropic lists Claude Opus 4.7 with the model ID claude-opus-4-7, $5 per million input tokens, $25 per million output tokens, a 1M-token context window, and 128k max output for the synchronous Messages API.

Those numbers matter because the value proposition is not hidden. If you already know your workload justifies Opus pricing, 4.7 is the version you should benchmark first. If you do not already know that, start by asking whether Sonnet 4.6 is good enough at a lower spend.

Minimal Messages API request

Claude Opus 4.7 uses the same Messages API surface as Anthropic's other current models. The generic API reference is the Messages API reference, but the only launch-specific change most developers need on day one is the model value itself.

A minimal request looks like this:

curl https://api.anthropic.com/v1/messages \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "content-type: application/json" \
  -d '{
    "model": "claude-opus-4-7",
    "max_tokens": 1024,
    "messages": [
      {"role": "user", "content": "Review this architecture and suggest the safest migration plan."}
    ]
  }'

When to choose Opus 4.7

Anthropic is explicit about the target workloads in the Claude Opus product page. Opus 4.7 is for demanding coding, complex agentic workflows, and enterprise knowledge work where prior models still needed too much supervision.

That means Opus 4.7 is a premium choice, not the default for every API call. If your requests are short, repetitive, or cost-sensitive, Sonnet 4.6 remains the more likely default. If the work is hard enough that model failure is more expensive than model spend, Opus 4.7 is the model to test.

How to migrate from older Claude models

Migrating from Opus 4.6 or older usually starts with one tiny change: swap the model string and rerun your evals. Anthropic's current models overview now includes a dedicated "Migrating to Claude Opus 4.7" section, which is Anthropic's own signal that 4.7 should be treated as the upgrade target for current Opus users.

I would not stop at a string replacement, though. Rerun your hardest prompts, your tool-use flows, your long-context tasks, and your failure-mode tests. Anthropic is claiming better reliability, stronger self-verification, and better coding autonomy. Those are all things you can and should verify in your own harness in one afternoon.

What changes on Bedrock, Vertex, and Foundry

The first-party Anthropic API is the cleanest way to adopt Opus 4.7 immediately. For cloud integrations, the story is slightly messier. the Claude Opus product page says 4.7 is available on Bedrock, Vertex AI, and Microsoft Foundry, while Anthropic's current models overview adds that the AWS path is currently research preview.

That means your application logic does not need to change much, but your platform rollout may. On Anthropic's own API you pass model: "claude-opus-4-7". On Vertex AI the model is typically specified in the endpoint path rather than the request body, and on Microsoft Foundry the deployment name you created becomes the value in the model field.

Limitations and Tradeoffs

The code example above is a valid Anthropic Messages API shape, but launch-day cloud platform docs can lag behind the first-party product page. If you are adopting Opus 4.7 through Bedrock, Vertex AI, or Foundry, confirm the exact model name and availability in that platform before scheduling a cutover.

Related Guides

• Best Claude Models in 2026
• Claude Opus 4.6 on OpenClaw
• Claude Mythos and Project Glasswing
• OpenClaw vs Claude Pro

FAQ

What model name should I use for Claude Opus 4.7?

Use `claude-opus-4-7` in the Anthropic first-party API. That model ID is listed in Anthropic's current models overview.

Do I need a new Anthropic API endpoint for Claude Opus 4.7?

No. Claude Opus 4.7 uses the same Messages API endpoint as Anthropic's other current models. You change the `model` value, not the endpoint itself.

What does Claude Opus 4.7 cost in the API?

Anthropic lists Claude Opus 4.7 at $5 per million input tokens and $25 per million output tokens.

Should I use Claude Opus 4.7 or Sonnet 4.6?

Use Opus 4.7 when the task is hard enough that failure or rework costs more than the extra model spend. Use Sonnet 4.6 for everyday production traffic when you need a better speed-to-cost balance.