Anthropic

Claude opus 5 5

Text

1M context; long-running agentic coding and knowledge work

Input $4.00 / 1M tokens | Output $20.00 / 1M tokens Claude opus 5 5 API reference →
Model health Healthy
runapi.ai
# Base URL
https://runapi.ai

# Endpoints
POST /v1/chat/completions
POST /v1/responses
POST /v1/messages
POST /v1beta/models/claude-opus-5-5:generateContent
POST /v1beta/models/claude-opus-5-5:streamGenerateContent
curl https://runapi.ai/v1/messages \
  -H "Authorization: Bearer $RUNAPI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "claude-opus-5-5",
  "max_tokens": 1024,
  "messages": [
    {
      "role": "user",
      "content": "Review this pull request for security vulnerabilities, performance issues, and suggest concrete improvements."
    }
  ]
}'
import anthropic

client = anthropic.Anthropic(
    base_url="https://runapi.ai",
    api_key="your-runapi-key"
)

message = client.messages.create(
    model="claude-opus-5-5",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Review this pull request for security vulnerabilities, performance issues, and suggest concrete improvements."}]
)
import Anthropic from "@anthropic-ai/sdk";

const client = new Anthropic({
  baseURL: "https://runapi.ai",
  apiKey: "your-runapi-key"
});

const message = await client.messages.create({
  model: "claude-opus-5-5",
  max_tokens: 1024,
  messages: [{ role: "user", content: "Review this pull request for security vulnerabilities, performance issues, and suggest concrete improvements." }]
});
https://runapi.ai 5 endpoints
Playground

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Estimated: Input $4.00 / 1M tokens | Output $20.00 / 1M tokens

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Specifications

Technical details

Provider Anthropic
Model ID claude-opus-5-5
Modality Text
Task types Synchronous
API endpoint /v1/chat/completions
/v1/responses
/v1/messages
/v1beta/models/claude-opus-5-5:generateContent
/v1beta/models/claude-opus-5-5:streamGenerateContent
Billing unit 1K tokens
Catalog status Operational
HOW IT WORKS

Use This Model in 3 Steps

  1. Get Your Key

    Sign up for free and create an API key for claude-opus-5-5 from the dashboard.

  2. Send a Request

    POST to /v1/messages with the claude-opus-5-5 model slug and your parameters.

  3. Get Results

    Read the completed claude-opus-5-5 response directly from the endpoint.

What this model offers

Endpoint coverage

Exposes 1 public endpoint(s): message.

Usage-based billing

Metered by 1K tokens with no subscription requirement.

Claude opus 5 5 Pricing

Endpoint
Resolution
Duration
Price
message
Not available
1K tokens
Input: $4.00 / 1M tokens Output: $20.00 / 1M tokens
  • Cache read: $0.20 / 1M tokens
  • Cache write 5m: $5.00 / 1M tokens
  • Cache write 1h: $8.00 / 1M tokens
API REFERENCE

Endpoint Specification

Endpoint
POST /v1/messages
Model ID
claude-opus-5-5
Task Types
message
Max Duration
Unavailable
Resolutions
Unavailable
Aspect Ratios
Unavailable
Output Format
Unavailable
Avg Generation Time
Unavailable

Request parameters

No request parameters are published for this endpoint.

USE CASES

Customer support

Answer customer questions from a private knowledge base, reducing ticket volume.

Document analysis

Draft contract summaries and flag key clauses for attorney review.

Code generation

Auto-generate unit tests, code reviews, and refactoring suggestions in CI.

Usage metrics

Trusted by developers
5K+
API Calls / Day
98.5%
Success Rate
12.6s
Avg Generation

Verified customer feedback is not available for this model yet.

FAQ

Frequently asked questions about Claude opus 5 5

How do I select claude-opus-5-5?

Pass the model ID shown in the quickstart.

What's the rate limit on this variant?

Per-key rate limits scale with your usage tier. The pricing page shows current limits. If you need higher throughput, contact support to discuss tier upgrades.

Can I switch variants later?

Yes. Variant is a parameter in the request. Switch by changing the model ID — no code changes, no re-authentication, no separate billing setup. All variants share the same API key and request shape.

Does it stream?

Where streaming is available, RunAPI streams end-to-end. LLM models support token-level streaming. Media models use async task polling or webhook callbacks for result delivery.

Where do I report quality issues?

Open an issue on the public GitHub repo or email support at [email protected]. Include the task ID and model ID so the team can investigate the specific generation.

Do I need a separate provider account?

No. Your RunAPI API key is enough to access this variant and every other model in the catalog. You do not need accounts with the underlying provider.

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