Claude Opus 4.5
Claude Opus 4.5 represents Anthropic’s most powerful generation of large language models. It is optimized for advanced reasoning, complex problem solving, and extended multi-step tasks. The model supports long context windows, enabling it to analyze large documents, codebases, and structured data with high consistency. Claude Opus 4.5 demonstrates strong performance in coding, mathematics, legal analysis, and creative tasks while maintaining Anthropic’s safety-first training approach. It is instruction-tuned and reinforced through constitutional AI techniques, helping ensure helpful, honest, and harmless responses. Claude Opus 4.5 is widely used in enterprise, research, and developer environments requiring dependable and high-quality AI outputs.
Comparison
Claude Opus 4.5 consistently ranks at the top of Anthropic’s model lineup, outperforming Claude Sonnet and Claude Haiku in reasoning depth, coding accuracy, and long-context comprehension. Benchmarks published by Anthropic show notable improvements in complex instruction following and reduced hallucination rates.
Compared to competing frontier models, Claude Opus 4.5 emphasizes reliability, interpretability, and safety alignment over raw speed, making it particularly suitable for enterprise, legal, and research-focused workloads.
| Benchmark | Claude Opus 4.5 (Base) | Gemini 3 Pro | GPT-5.2 Thinking | GPT-5.2 Pro |
|---|---|---|---|---|
| GPQA Diamond | 88 | 91.9 | 92.4 | 93.2 |
| ARC-AGI-2 | 37.6 | 31.1 | 52.9 | 54.2 |
| AIME 2025 (no tools) | 94 | 95.0 | 100% | 100% |
| Humanity's Last Exam | 26 | 37.5 | 34.5 | 36.6 |
| SWE-bench Verified | 80.9 | 76.2 | 79.1 | 80.0 |
| MMMU-Pro | 72 | 81.0 | ||
| MMLU-Pro | 87.8 | 90.1 |
Team
Claude Opus 4.5 is developed by Anthropic, a leading AI research company focused on building reliable and aligned artificial intelligence systems. Anthropic’s team includes researchers, engineers, and policy experts with backgrounds from OpenAI, DeepMind, Google, and academic institutions. The organization emphasizes constitutional AI, safety research, and responsible deployment. Anthropic operates at large scale, supporting enterprise customers and developers worldwide while maintaining a strong focus on AI governance and long-term societal impact.
Community
Claude Opus 4.5 is supported by an active global developer and enterprise community. Anthropic provides extensive documentation, API references, safety guidance, and regular model updates. Community discussions occur across developer forums, GitHub integrations, and partner platforms, with strong engagement from professional users and researchers.