Claude Opus 5

Anthropic's flagship model for deep reasoning, complex agentic coding, and long-horizon enterprise work.

1M Context128k OutputAdaptive Thinking

Context Window

1M tokens

claude-opus-5

Max Output

128k tokens

1M tokens

Input

$4.5$5

10% off

1M tokens

Output

$22.5$25

10% off

1M tokens

Model Codeclaude-opus-5

Playground

Model Code

claude-opus-5

Reference inputs

Reference Images0/5

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Output

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Pricing

Plan	Context Window	Max Output	Input	Output	Cache Write	Cache Read
claude-opus-5	1M tokens	128k tokens	$4.5$510% off 1M tokens	$22.5$2510% off 1M tokens	$5.625$6.2510% off 1M tokens	$0.45$0.5010% off 1M tokens

1h Cache Write · $9 · 1M tokens

Cache read or cached input pricing applies to reused prompt tokens.

README

Claude Opus 5 is Anthropic's flagship model for complex agentic coding and enterprise work, with stronger deep reasoning, long-horizon execution, tool use, and multi-agent coordination.

Claude Opus 5 is built for demanding agentic and long-horizon work, including multi-file software engineering, complex refactors, code review, deep research, and enterprise workflows that require sustained reasoning across many steps.
The model provides a 1M-token context window and 128k-token maximum output. Adaptive thinking is enabled by default, while the effort control lets teams balance reasoning depth, latency, and token use from low through max effort.
Compared with Claude Opus 4.8, Claude Opus 5 improves deep reasoning, agentic coding, long-context instruction following, vision, document work, and multi-agent coordination. It also supports changing tools mid-conversation in beta while preserving the prompt cache.

API

Use the API docs for request format, parameters, and integration details.

Anthropic's flagship model for deep reasoning, complex agentic coding, and long-horizon enterprise work.

Model Code

claude-opus-5

View API Docs

API

Endpoint

POST /v1/messages

Authentication

Authorization: Bearer YOUR_REACH_API_KEY
anthropic-version: 2023-06-01
Content-Type: application/json

Example

curl -X POST "https://direct.reachapi.ai/v1/messages" \
  -H "Authorization: Bearer YOUR_REACH_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "YOUR_MODEL_ID",
    "messages": [
      {
        "role": "user",
        "content": "Introduce ReachAPI in one sentence."
      }
    ],
    "max_tokens": 512,
    "temperature": 0.2
  }'

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