Claude Opus 5

Name: Anthropic: Claude Opus 5
Brand: anthropic
SKU: anthropic/claude-opus-5
Price: 5.5 USD
Availability: InStock

anthropic/claude-opus-5

Claude Opus 5 is Anthropic’s flagship model for demanding reasoning, coding, and long-horizon agentic work.

$5.50 in · $27.50 out per 1M tokens1M contextJul 24, 2026

about 1.7¢ a message

A typical message: about 500 tokens you send and 500 it writes.

Chat with Claude Opus 5

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Also:batch

Spec sheet

Published facts from the catalog, billed prices and what we measured here. Anything not measured says so.

Price, billed here

Input, per 1M tokens: $5.50provider $5.00
Output, per 1M tokens: $27.50provider $25.00
Cached input, per 1M: $0.55provider $0.50
Cache write, per 1M: $6.875provider $6.25
Margin: +10%

Context and formats

Context window: 1,000,000 tokens
Longest answer: 128,000 tokens
Reads: text, images, and files
Makes: text
First listed: 2026-07-24

Measured here, last 7 days

First token, median: not measured
Answered without error: not measured

Tools and JSON

Tool calling: declaredthe provider's claim, not yet measured here
JSON output: declaredthe provider's claim, not yet measured here

Price and latency history as JSON: GET /api/planet/history?id=anthropic/claude-opus-5.

About

Claude Opus 5 is Anthropic’s flagship model for demanding reasoning, coding, and long-horizon agentic work. It is particularly strong at end-to-end software tasks, code review and bug finding, visual analysis...

In Anthropic's words.

Try it here

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The answer appears here.

Measured here

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Call it

Use one OpenAI compatible endpoint, this model's id and an am_live_ key from the dashboard. You can also try it in chat first with no key.

curl https://useantimatter.com/v1/chat/completions \
  -H "Authorization: Bearer $ANTIMATTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "anthropic/claude-opus-5", "messages": [{"role": "user", "content": "Hello"}]}'

Everything else is in the docs.

Embed this

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<a href="https://useantimatter.com/planet/anthropic/claude-opus-5"><img src="https://useantimatter.com/api/badge/price?id=anthropic%2Fclaude-opus-5" alt="Claude Opus 5 price on Antimatter" height="28"></a>

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