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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.
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Crazyrouter Team
January 22, 2026 / 517 views
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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)
Getting Started#
- Sign up at Crazyrouter
- Get your API key from the console
- Use the OpenAI-compatible endpoint
- Switch between models by changing the
modelparameter
For questions, contact support@crazyrouter.com
Implementation Guides
Reasoning ModelsChoose the right protocol and fields for thinking and reasoning workloads.Claude Native FormatCall Claude through the Anthropic Messages API on Crazyrouter.List ModelsQuery models available to the current API key through GET /v1/models.Usage Logs and Cost MonitoringUse management APIs to query logs, quota, token usage, and dollar cost.
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