AnthropicMediumUltra

Claude Opus 5

Anthropic's latest flagship Opus model, with a 1M-token context window by default and 128K max output tokens. Same pricing as Opus 4.5–4.8 ($5/$25 per M tokens) with prompt caching (read $0.50/M, write $6.25/M) and web search. Compatible with the Anthropic Messages and OpenAI Chat Completions formats.

9,290/46,450credits

input / output · per 1M tokens

Most capable Anthropic model

1M token context window (default)

128K max output tokens

Prompt caching (read 10% / write 125% of input price)

Web search tool support

High-resolution vision (up to 2,576px long edge)

Streaming support

Run it right now

Test this model instantly in the Console Playground — no code required

Use with AI Assistant

Copy usage instructions for Claude, ChatGPT, or other AI

llms.txtllms.txt ↗

Model Specifications

Context Window

tokens

Max Output

128K

tokens

Training Cutoff

2026-01

Compatible SDK

Anthropic, OpenAI

Capabilities

Vision

Function Calling

Streaming

JSON Mode

System Prompt

Token Pricing (per 1M tokens)

Token Type	Credits	USD Equivalent
Input Tokens	9,290	$6.19
Output Tokens	46,450	$30.97
Cached Tokens	929	$0.62

* 1,500 credits ≈ $1 (actual charges may vary based on usage)

Quick Start

curl -X POST "https://api.core.today/llm/anthropic/v1/messages" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer cdt_your_api_key" \
  -d '{
  "model": "claude-opus-5",
  "messages": [
    {
      "role": "system",
      "content": "You are a principal research analyst. Provide rigorous, source-aware analysis."
    },
    {
      "role": "user",
      "content": "Given this corpus of quarterly reports, identify the three biggest emerging risks and quantify their exposure."
    }
  ],
  "max_tokens": 8000
}'

Parameters

Parameter	Type	Required	Default	Description
`messages`	array	Yes	-	Array of message objects (OpenAI format)
`max_tokens`	integer	No	4096	Maximum tokens in response (up to 128000)
`stream`	boolean	No	false	Enable Server-Sent Events streaming

Examples

Long-context Analysis

Deep multi-step analysis over large documents with Claude Opus 5

curl -X POST "https://api.core.today/llm/anthropic/v1/messages" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer cdt_your_api_key" \
  -d '{
  "model": "claude-opus-5",
  "messages": [
    {
      "role": "system",
      "content": "You are a principal research analyst. Provide rigorous, source-aware analysis."
    },
    {
      "role": "user",
      "content": "Given this corpus of quarterly reports, identify the three biggest emerging risks and quantify their exposure."
    }
  ],
  "max_tokens": 8000
}'

Production Code Generation

Generate production-ready code with full reasoning

curl -X POST "https://api.core.today/llm/anthropic/v1/messages" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer cdt_your_api_key" \
  -d '{
  "model": "claude-opus-5",
  "messages": [
    {
      "role": "system",
      "content": "You are a senior software engineer. Write clean, well-tested, production code."
    },
    {
      "role": "user",
      "content": "Implement an idempotent payment reconciliation worker in Python with retries and unit tests."
    }
  ],
  "max_tokens": 6000
}'