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Claude Opus 4.5 vs GPT-5.2 - Which AI Model Should You Choose in 2026

A comprehensive comparison of Anthropic's Claude Opus 4.5 and OpenAI's GPT-5.2. Learn the strengths, weaknesses, and best use cases for each model.

Crazyrouter Team

January 22, 2026 / 1260 views

Claude Opus 4.5 vs GPT-5.2 - Which AI Model Should You Choose in 2026

Crazyrouter

Read the docs Open API Playground Open image tool Check live pricing

Choosing between Claude Opus 4.5 and GPT-5.2 can be challenging. Both are frontier AI models with exceptional capabilities. This guide compares them across key dimensions to help you make the right choice.

Model Overview#

Claude Opus 4.5 (claude-opus-4-5-20251101)#

Anthropic's most capable model, featuring:

Extended context window (200K tokens)
Superior code generation and analysis
Strong reasoning with transparency
Constitutional AI safety approach
Thinking mode for complex reasoning

GPT-5.2 (gpt-5.2)#

OpenAI's flagship model, offering:

Multimodal capabilities (text, image, audio)
Advanced function calling
Broad knowledge base
Excellent creative writing
Search API integration

Head-to-Head Comparison#

Feature	Claude Opus 4.5	GPT-5.2
Input Price ($/1M)	$15.00	$1.75
Output Price ($/1M)	$75.00	$14.00
Context Window	200K tokens	128K tokens
Code Generation	Excellent	Excellent
Creative Writing	Very Good	Excellent
Reasoning	Excellent	Excellent
Multimodal	Text + Images	Text + Images + Audio

Complete Claude Model Family#

Crazyrouter supports the full Claude lineup:

Model	Input ($/1M)	Output ($/1M)	Use Case
claude-opus-4-5-20251101	$15.00	$75.00	Most capable
claude-opus-4-1-20250805	$15.00	$75.00	High performance
claude-opus-4-20250514	$15.00	$75.00	Stable release
claude-sonnet-4-5-20250929	$3.00	$15.00	Balanced
claude-sonnet-4-20250514	$3.00	$15.00	Fast, efficient
claude-haiku-4-5-20251001	$1.00	$5.00	Quick, low cost

Code Examples#

Using Claude Opus 4.5#

python

from openai import OpenAI

client = OpenAI(
    api_key="sk-your-api-key",
    base_url="https://crazyrouter.com/v1",
    default_headers={
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36"
    }
)

response = client.chat.completions.create(
    model="claude-opus-4-5-20251101",
    messages=[
        {"role": "system", "content": "You are an expert software architect."},
        {"role": "user", "content": "Design a microservices architecture for an e-commerce platform."}
    ],
    max_tokens=4000
)

print(response.choices[0].message.content)

Using Claude with Thinking Mode#

python

response = client.chat.completions.create(
    model="claude-opus-4-5-20251101-thinking",
    messages=[
        {"role": "user", "content": "Analyze this complex algorithm and suggest optimizations."}
    ]
)

Using GPT-5.2#

python

response = client.chat.completions.create(
    model="gpt-5.2",
    messages=[
        {"role": "system", "content": "You are an expert software architect."},
        {"role": "user", "content": "Design a microservices architecture for an e-commerce platform."}
    ],
    max_tokens=4000
)

print(response.choices[0].message.content)

When to Choose Claude Opus 4.5#

Best for:

Long document analysis (200K context)
Complex code review and generation
Tasks requiring step-by-step reasoning
Applications needing transparent AI decisions
Enterprise compliance requirements

Example use case - Code Review:

python

response = client.chat.completions.create(
    model="claude-opus-4-5-20251101",
    messages=[
        {"role": "user", "content": """Review this code for security vulnerabilities:

def login(username, password):
    query = f"SELECT * FROM users WHERE username='{username}' AND password='{password}'"
    result = db.execute(query)
    return result
"""}
    ]
)

When to Choose GPT-5.2#

Best for:

Multimodal applications (text + audio)
Creative content generation
Conversational AI assistants
Applications requiring function calling
Real-time search integration

Example use case - Search API:

python

response = client.chat.completions.create(
    model="gpt-5-search-api",
    messages=[{"role": "user", "content": "What are the latest AI developments today?"}]
)

Pricing Comparison#

Model	Input ($/1M)	Output ($/1M)
claude-opus-4-5-20251101	$15.00	$75.00
gpt-5.2	$1.75	$14.00
claude-sonnet-4-5-20250929	$3.00	$15.00
gpt-5-mini	$0.25	$2.00
claude-haiku-4-5-20251001	$1.00	$5.00
gpt-5-nano	$0.05	$0.40

Pricing Disclaimer: The prices shown in this article are for demonstration purposes only and may change at any time. Actual billing will be based on the real-time prices displayed when you make your request.

Recommendation Summary#

Scenario	Recommended Model
Code generation & review	Claude Opus 4.5
Creative writing	GPT-5.2
Long document analysis	Claude Opus 4.5
Audio applications	GPT-5.2
Cost-sensitive projects	GPT-5-mini or Claude Haiku
Complex reasoning	Either (both excellent)

Try Both Models#

The best way to decide is to test both models with your specific use case:

python

models = ["claude-opus-4-5-20251101", "gpt-5.2"]
prompt = "Your test prompt here"

for model in models:
    response = client.chat.completions.create(
        model=model,
        messages=[{"role": "user", "content": prompt}]
    )
    print(f"\n=== {model} ===")
    print(response.choices[0].message.content)