Claude 4 Opus
Anthropic · 2025
Anthropic's most powerful model for complex reasoning, research, and specialized tasks.
Quick Facts
Parameters
Undisclosed
Context Window
200K tokens
Modalities
text, image, audio
Open Source
No
Pricing
$20/mo Pro / $30/user/mo Team
Released
2025
Developer
Anthropic
About
Claude 4 Opus is Anthropic's most powerful AI model, designed for complex reasoning, research, and specialized tasks requiring the deepest analytical thinking. It represents a significant leap in reasoning depth, scientific knowledge, and nuanced understanding compared to earlier Claude generations. With a 200K token context window and enhanced multimodal capabilities including audio processing alongside text and images, Claude 4 Opus excels at domains that demand rigorous analytical thought: scientific research where it can analyze papers, propose experiments, and synthesize findings across disciplines; legal analysis where it reviews contracts with attention to subtle language; mathematical reasoning where it works through proofs step by step; and software architecture where it designs systems with consideration for trade-offs and edge cases. Built on Anthropic's advanced Constitutional AI, Claude 4 Opus maintains strong safety alignment while pushing the boundaries of capability. It is the preferred choice for professionals working on cutting-edge research, complex mathematical proofs, legal analysis, and any domain requiring the highest level of cognitive performance. At USD 15.00 per 1M input tokens for API access, Claude 4 Opus is the most expensive model in the Claude lineup, reflecting its superior capabilities. The USD 20 per month Pro subscription includes access alongside Sonnet, while the USD 30 per user per month Team plan adds shared workspaces and priority support. For users who previously found Claude 3.5 Sonnet excellent but occasionally hitting limits on extremely complex tasks, Claude 4 Opus provides the headroom needed for the hardest problems.
Strengths
- +Deepest reasoning and analytical capabilities in Claude family
- +Exceptional at scientific and technical domains
- +Superior long-context understanding and recall
- +Advanced multimodal understanding
Weaknesses
- −Higher cost per token than Sonnet
- −Slower response times for deep reasoning
- −Over-provisioned for simple daily tasks
Best For
Advanced research and scientific analysis
Complex legal document review
Mathematical reasoning and proofs
High-stakes professional decision support
Pricing
Pro
$20/mo
- Claude 4 Opus access
- Higher rate limits
- Projects
Team
$30/user/mo
- All Pro features
- Shared workspaces
- Priority support
API
$15.00/1M input tokens
- Pay-as-you-go
- 200K context
- Multimodal input
Technical Specs
Parameters
Undisclosed
Context Window
200K tokens
Modalities
text, image, audio
Languages
Open Source
No
Developer
Anthropic
Released: 2025
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