What is Claude Opus 4.5?
Claude Opus 4.5 is Anthropic’s flagship frontier model released November 24, 2025, excelling in coding, agents, computer use, reasoning, and enterprise workflows with efficient token use and 200K context.
When was Claude Opus 4.5 released?
It was officially released and made available on November 24, 2025, across Claude apps, API, and major cloud platforms.
How much does Claude Opus 4.5 cost?
API pricing is $5 per million input tokens and $25 per million output tokens; consumer access requires Pro/Max/Team/Enterprise subscriptions starting around $20/month.
What is the context window for Claude Opus 4.5?
It supports a 200,000 token context window with automatic summarization for handling very long conversations effectively.
Is Claude Opus 4.5 better than previous Claude models?
Yes, it significantly outperforms Sonnet 4.5 and prior Opus versions in coding, reasoning, token efficiency, vision, and agentic tasks.
What are the key benchmarks for Claude Opus 4.5?
It achieves 80.9 percent on SWE-bench Verified (SOTA), leads on Terminal-bench, Aider Polyglot, BrowseComp-Plus, and excels in internal enterprise evaluations.
How can I access Claude Opus 4.5?
Available on claude.ai/apps (paid tiers), Claude API (model claude-opus-4-5-20251101), and clouds like AWS Bedrock, Google Vertex AI, Azure.
What tools integrate with Claude Opus 4.5?
Includes Claude Code (Plan Mode), Claude for Chrome/Excel, Agent SDK, and developer platform features like effort control and memory tools.
Claude Opus 4.5
Anthropic’s Flagship Frontier Model – Leading in Coding, Agents, Computer Use, and Enterprise Workflows with Efficient Reasoning
Last Updated: December 19, 2025
By Zelili AI
About This AI
Claude Opus 4.5 is Anthropic’s most intelligent model released on November 24, 2025, completing the Claude 4.5 family after Sonnet and Haiku.
It sets new standards in coding (SOTA on SWE-bench Verified at 80.9 percent), agentic tasks, computer use, and complex enterprise workflows like deep research, spreadsheets, slides, and long-horizon autonomous execution.
Key advancements include breakthrough judgment on ambiguous real-world problems, significant token efficiency (up to 76 percent fewer output tokens at medium effort), improved vision for Excel automation and 3D visualizations, 200K context window with automatic summarization for infinite chats, and enhanced tool use/memory capabilities.
The model excels at multi-step reasoning, code migration/refactoring, bug fixing across systems, creative problem-solving, and robust alignment with low prompt injection vulnerability.
Pricing is dramatically reduced to 5 per million input tokens and 25 per million output tokens via API, making Opus-level power more accessible.
Available immediately on Claude apps (web/mobile), API (model ID claude-opus-4-5-20251101), and major clouds (AWS Bedrock, Google Vertex AI, Azure).
Developer tools include effort parameter for capability vs speed tradeoffs, context compaction, advanced tool orchestration, and integrations like Claude Code (Plan Mode), Claude for Chrome (Max users), Claude for Excel (Max/Team/Enterprise), and Agent SDK.
With strong performance across benchmarks and real-world tasks, it positions as a top choice for developers, engineers, enterprises, and professionals needing reliable, efficient frontier intelligence.
Key Features
- State-of-the-art coding and agents: Leads on SWE-bench Verified (80.9 percent), Terminal-bench, Aider Polyglot, and agentic benchmarks with fewer tokens and steps
- Efficient reasoning: Effort parameter (medium/high) balances speed and capability; up to 76 percent fewer output tokens at medium effort
- 200K context window: Supports long conversations with automatic summarization and compaction for infinite chats without hitting limits
- Advanced vision and multimodal: Improved Excel automation, financial modeling, 3D visualizations, and file/image understanding
- Tool use and memory: Enhanced orchestration, memory tools, context management, and subagent capabilities for complex workflows
- Robust alignment: Most robustly aligned frontier model with low prompt injection vulnerability and high honesty
- Developer platform enhancements: Claude Code with Plan Mode, Claude for Chrome/Excel integrations, Agent SDK
- Token-efficient outputs: 50-75 percent reductions in tool calling, build/lint errors, and token usage on hard tasks
- Multi-language coding: Leads 7 out of 8 languages on SWE-bench Multilingual
- Autonomous long-horizon execution: Handles 30-minute+ coding sessions and deep research reliably
Price Plans
- Free ($0): Limited access to lighter models; Opus 4.5 not available on free tier
- Claude Pro/Max ($20/Month or higher): Access to Opus 4.5 with expanded limits, tools like Code/Chrome/Excel, and priority features
- Team/Enterprise (Custom): Higher limits, API priority, security, and dedicated support; API pricing at 5 input/25 output per million tokens
Pros
- Top-tier coding/agent performance: Outperforms competitors on real-world software engineering and tool use benchmarks
- Dramatic cost reduction: 67 percent cheaper than prior Opus at 5 input/25 output per million tokens
- High efficiency: Fewer tokens/steps for same or better results compared to Sonnet 4.5
- Strong enterprise fit: Excels at spreadsheets, slides, deep analysis, and multi-system tasks
- Robust safety/alignment: Lowest dishonesty rates and prompt injection resistance among frontiers
- Immediate broad availability: Live on apps, API, and all major clouds from day one
- Developer-friendly controls: Effort parameter, memory, compaction for customizable intelligence
Cons
- Paid priority access: Full capabilities and high limits require Pro/Max/Team/Enterprise subscriptions
- High effort slower: Maximum reasoning mode increases latency on complex queries
- Knowledge cutoff May 2025: Relies on browsing/tool use for post-cutoff events
- Token pricing for heavy use: API costs add up for very high-volume applications
- Integration rollout: Some tools like Excel in beta or limited to higher tiers
- No offline support: Requires internet and Anthropic platform access
- Competitive pressure: Rapid releases from OpenAI/Google keep the landscape fast-moving
Use Cases
- Advanced software engineering: Complex coding, refactoring, bug fixing, multi-system migrations
- Agentic workflows: Autonomous multi-step tasks, tool orchestration, long-horizon execution
- Enterprise productivity: Excel automation, financial modeling, slide creation, deep research
- Developer tools integration: Claude Code, API agents, IDE support via SDK
- Professional analysis: Spreadsheet heavy work, data synthesis, report generation
- Creative problem-solving: Ambiguous real-world scenarios with tradeoffs and judgment
- Team collaboration: Shared long-context chats, summaries, and action tracking
Target Audience
- Software engineers and developers: Needing best-in-class coding and agent support
- Enterprise teams: Automating spreadsheets, research, and workflows with high reliability
- Product managers and analysts: Deep analysis, planning, and multi-tool tasks
- Researchers and technical writers: Long-form reasoning and synthesis
- Business professionals: Productivity tools like Excel, slides, and decision support
- AI power users: Leveraging frontier capabilities via API or Pro/Max tiers
How To Use
- Access via Claude: Log into claude.ai or app; select Opus 4.5 from model picker (paid tier required)
- API integration: Use claude-opus-4-5-20251101 in Anthropic API calls with effort parameter
- Set effort level: Medium for balance, high for maximum capability on hard tasks
- Upload files/images: Attach for vision analysis or Excel automation
- Use tools: Enable Claude Code, memory, or advanced orchestration in prompts
- Manage context: Rely on auto-summarization for long chats; compact manually if needed
- Monitor usage: Track tokens and limits in dashboard for cost control
How we rated Claude Opus 4.5
- Performance: 4.9/5
- Accuracy: 4.8/5
- Features: 4.9/5
- Cost-Efficiency: 4.7/5
- Ease of Use: 4.6/5
- Customization: 4.7/5
- Data Privacy: 4.8/5
- Support: 4.5/5
- Integration: 4.8/5
- Overall Score: 4.8/5
Claude Opus 4.5 integration with other tools
- Claude Apps and API: Native across web, mobile, desktop, and developer platform
- Major Clouds: AWS Bedrock, Google Vertex AI, Azure for enterprise deployment
- Claude for Excel: Direct integration for spreadsheet automation (Max/Team/Enterprise)
- Claude for Chrome: Browser extension for Max users to interact on any site
- Claude Code and Agent SDK: IDE support, Plan Mode, and custom agent building
Best prompts optimised for Claude Opus 4.5
- Act as a senior software engineer: analyze this large codebase, identify bugs across multiple files, propose refactors, and implement fixes step-by-step with minimal tokens
- Perform deep research on [topic]: use tools to browse sources, synthesize findings, create structured report with citations, and handle ambiguities
- Automate this Excel workflow: [describe task], optimize formulas, generate charts, and explain reasoning in detail
- Build an autonomous agent plan for [complex project]: break into steps, use tools when needed, execute with self-correction
- Review this code pull request: catch issues, suggest improvements, write thorough comments without verbosity
Claude Opus 4.5 sets a new benchmark for frontier AI with SOTA coding/agent performance, efficient token usage, and strong enterprise tools like Excel automation. The sharp price drop makes it highly accessible, while robust alignment and developer controls add reliability. A top pick for professionals tackling complex real-world tasks, though full power requires paid tiers.
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