Anthropic/operational

Anthropic: Claude Opus 5.5

Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step changes in large codebases, code...

Input / output per 1M

$4.00/$20.00

Get an API key

codefunction-callingreasoningvision

1.0M

Context window

tokens

128K

Max output

tokens per reply

62ms

Time to first token

p50, EU region

$20.00

Output price

per 1M tokens

Fit

Where this model earns its place

code

Code generation and refactoring across large repositories, including multi-file changes.

function calling

Tool use and structured output — dependable JSON for agent loops, RAG pipelines, and workflow automation.

reasoning

Multi-step reasoning — planning, quantitative analysis, and problems that need deliberation rather than recall.

vision

Image input — screenshots, scanned documents, charts, and photographed forms, without a separate OCR step.

Data handling

Requests are processed in the EU. Prompts are not used for training, and logs follow the retention period in your contract — zero-retention is available on request.

Specifications

Model

Model ID: anthropic/claude-opus-5.5
Provider: Anthropic
Context length: 1.0M
Max output: 128K
Modality: text + image
Licence: Proprietary

Commercial

Input: $4.00
Output: $20.00
Cached input: $0.20
Deployment: serverless
Availability: operational
Last updated: 2026-10-26

Cost

What a month actually costs

Workload	Input tokens	Output tokens	Monthly cost
Prototype	1.0M	250K	$9.00
Production	50.0M	12.0M	$440.00
At scale	500.0M	120.0M	$4,400

Illustrative volumes at list price, excluding cached-input discounts and any committed-use agreement. Your invoice shows the same rates, itemised per key.

Cheaper by caching

Repeated prompts — system instructions, retrieved context, few-shot examples — are billed at the cached-input rate where the model supports it. On long system prompts this is typically the largest single line-item saving.

API

Same SDK, different base URL

cURL

curl https://api.itciphtech.com/v1/chat/completions \
  -H "Authorization: Bearer $CIPHER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "anthropic/claude-opus-5.5",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

TypeScript

import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.itciphtech.com/v1",
  apiKey: process.env.CIPHER_API_KEY,
});

const res = await client.chat.completions.create({
  model: "anthropic/claude-opus-5.5",
  messages: [{ role: "user", content: "Hello!" }],
});

Alternatives

Close substitutes in the catalog

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Anthropic: Claude Opus 4.8

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Anthropic: Claude Sonnet 5.5

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Cohere: Command A

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