GPT-5.2 vs Claude Opus 4.5: Complete Comparison 2025
Quick Verdict:
GPT-5.2 is the superior choice for extremely complex reasoning, multimodal tasks, and massive document analysis (400K context). Claude Opus 4.5 is preferred for software engineering, agentic workflows, and applications where cost-efficiency and lower latency are critical. Both models represent the peak of AI performance in 2025.
Compare OpenAI's GPT-5.2 and Anthropic's Claude Opus 4.5 side-by-side. See which AI model performs better for your specific use case with live testing.
GPT-5.2 Pro
- State-of-the-art reasoning and problem-solving
- 400K context window
- Multimodal capabilities
- $15/1M input tokens, $120/1M output
Claude Opus 4.5
- Superior coding and agentic capabilities
- 200K context window
- Enhanced safety alignment
- $5/1M input tokens, $25/1M output
Head-to-Head Comparison
| Feature | GPT-5.2 Pro | Claude Opus 4.5 |
|---|---|---|
| Code Generation | Excellent | Excellent |
| Reasoning Tasks | Outstanding | Excellent |
| Response Speed | ~1.5-3 seconds | ~1-2 seconds |
| Context Window | 400K tokens | 200K tokens |
| Cost (per 1M tokens) | $15 / $120 | $5 / $25 |
Which Model Should You Choose?
Choose GPT-5.2 for:
- •Extremely complex reasoning tasks
- •Multimodal applications
- •Large document processing (400K context)
- •Scientific and research applications
Choose Claude Opus 4.5 for:
- •Advanced coding and software engineering
- •Agentic AI applications
- •Cost-sensitive deployments
- •Speed-critical production systems
Try Both Models Side-by-Side
Don't just take our word for it. Test GPT-5.2 and Claude Opus 4.5 with your own prompts and see which performs better for your use case.
Detailed Analysis: GPT-5.2 vs Claude Opus 4.5
Performance Benchmarks
Both GPT-5.2 and Claude Opus 4.5 represent the pinnacle of AI development as of December 2025. GPT-5.2 Pro demonstrates exceptional performance in complex reasoning tasks, achieving state-of-the-art results on benchmarks like Humanity's Last Exam and advanced mathematical problem-solving. Claude Opus 4.5 excels particularly in software engineering tasks, scoring 73.3% on SWE-Bench Verified and demonstrating superior agentic capabilities for autonomous coding tasks.
Cost Considerations
Cost represents a significant differentiator between these two flagship models. Claude Opus 4.5 offers substantial cost advantages, with input tokens at $5 per million compared to GPT-5.2 Pro's $15 per million—a 67% cost reduction. For high-volume production applications, this translates to meaningful savings. A typical enterprise processing 100M tokens monthly would save approximately $1,000/month on input costs and $9,500/month on output costs by choosing Claude Opus 4.5 over GPT-5.2 Pro.
Context Window and Capabilities
GPT-5.2 Pro's 400K token context window represents a breakthrough in handling massive documents, doubling Claude Opus 4.5's already impressive 200K window. This allows GPT-5.2 to process approximately 300,000 words in a single request—ideal for comprehensive legal document analysis, extensive codebases, or multi-document research synthesis. However, for most practical applications, Claude's 200K context window (approximately 150,000 words) remains more than sufficient.
Response Speed and Latency
In production environments, Claude Opus 4.5 maintains a slight speed advantage, with average response times of 1-2 seconds compared to GPT-5.2 Pro's 1.5-3 seconds. While GPT-5.2 offers "instant" and "thinking" modes to balance speed and reasoning depth, Claude's consistently fast responses make it particularly well-suited for user-facing applications where every millisecond of latency impacts user experience.
Specialized Capabilities
GPT-5.2 introduces advanced multimodal capabilities, seamlessly processing text, code, images, audio, and video in a unified model. The introduction of "Skills in Codex" allows developers to create modular instruction bundles for specific workflows. Claude Opus 4.5, on the other hand, focuses on exceptional coding performance and agentic capabilities, with enhanced computer use features and long-running workflow support making it ideal for autonomous AI systems.
Conclusion
The choice between GPT-5.2 and Claude Opus 4.5 depends on your specific requirements. GPT-5.2 Pro is the premium choice for the most demanding reasoning tasks, multimodal applications, and scenarios requiring massive context windows. Claude Opus 4.5 excels in software engineering, agentic AI, and cost-sensitive production deployments. The best approach is to test both models with your actual use cases using tools like prompt-compare to make data-driven decisions based on real performance metrics.