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AI Models & Assistants / Knowledge library
Claude Opus 4.5
Claude Opus 4.5 is a versioned Claude language model. Consult its lifecycle and model documentation before selecting it.
Why learn Claude Opus 4.5?
Offers the documented Anthropic model capabilities through hosted.
The problem it solves
Provides model inference for supported text inputs.
Where it came from
Claude Opus 4.5: Claude Opus 4.5 is a versioned Claude language model. Consult its lifecycle and model documentation before selecting it. Published aliases: claude-opus-4-5-20251101. Input: text. Output: consult source. Checked 2026-10-13. Model capabilities are distinct from tools available in a particular agent.
Build your understanding
Work through these exercises in order. Try the task before opening a reference.
- Explain what Claude Opus 4.5 does.
- Identify a use case for Claude Opus 4.5.
- Describe a limitation of Claude Opus 4.5.
- Name a compatible tool for Claude Opus 4.5.
- Compare Claude Opus 4.5 against an alternative.
Documentation and sources
- Primary source / model card (platform.claude.com)
Catalog research notes
- See the AI Workbench for source dates, pricing evidence and configuration details.
Connect the ideas
Built on
Real World Example
Legacy Compliance Audit Automation
Financial institutions maintaining long-term regulatory archives.
The business problem
Manual review of legacy documentation is costly and prone to human error, especially when dealing with complex, multi-year compliance requirements that exceed the reasoning capabilities of smaller, faster models.
How this topic solves it
Utilizing the extended thinking capabilities of Claude Opus 4.5 allows for deep, methodical analysis of dense regulatory text within its 200K token context window, ensuring high-fidelity extraction of compliance obligations.
- Ingest historical compliance PDFs into a structured vector database.
- Define a system prompt that leverages the extended thinking mode to evaluate document segments against current regulatory standards.
- Execute batch processing requests using the claude-opus-4-5-20251101 model ID to analyze document chunks.
- Aggregate the model's reasoning outputs to generate a final compliance gap report.
The flow of data from legacy storage through the model's extended thinking process to the final report.
Extended Thinking Engine
Final Output
- Legacy Archive → Ingest 200K context → Claude Opus 4.5
- Claude Opus 4.5 → Generate gap analysis → Compliance Report
Expected business outcome
A consistent, auditable trail of reasoning that identifies potential regulatory non-compliance in legacy archives without requiring manual intervention.
Limitations and checks
As a legacy model, Claude Opus 4.5 has a knowledge cutoff of May 2025, meaning it cannot natively understand regulatory changes enacted after that date. Verification requires checking the model's output against a post-May 2025 regulatory database.