Claude Opus 5

DEVELOPED BY: Anthropic • LAST UPDATED: 9/1/2026

Compare Model

CCI (Capability)52.2Consensus: N/A

Context Window1.0MMax token length

In/Out Pricing$5/$25Blended cost/1M: $10.00

Pulse (Popularity)76/100Adoption + discussion proxy

Model Description

OpenRouter model gateway for Claude Opus 5.

Domain Averages

Reasoning56.6%

Coding48.1%

Math33.5%

Preference70.6%

Jury & Benchmark Signals

Source / Harness	Score
GPQA-Diamond	55%
Humanity's Last Exam	51%
MMLU-Pro	80%
SWE-bench Verified	35%
LiveCodeBench	40%
AIME	38%
LMArena style-controlled Elo	1240

Supported Modalities

INPUT:

text

OUTPUT:

text

Search Tags

#text#reasoning#creative

How to Use This Model

Python SDK Integration:

import openai

client = openai.OpenAI(
  base_url="https://openrouter.ai/api/v1",
  api_key="YOUR_OPENROUTER_KEY"
)

response = client.chat.completions.create(
  model="anthropic/claude-opus-5",
  messages=[
    {"role": "user", "content": "Explain quantum entanglement in 1 sentence."}
  ]
)

cURL Terminal Request:

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

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