Claude 4.5 Opus

Name: Claude 4.5 Opus
Author: Anthropic

AnthropicProprietaryPending Human Review

Claude 4.5 Opus is the most intelligent and capable model in the Claude 4.5 family, designed for the most demanding reasoning, research, and coding tasks. It introduces a unique 'effort' parameter (low, medium, high) that allows users to control the depth of the model's reasoning process and token usage. Opus 4.5 excels in handling ambiguity, complex problem-solving, and deep analysis, often succeeding where other models fail on multi-system bugs or intricate research questions. It is priced to be more accessible than previous Opus generations while delivering state-of-the-art performance.

2025-11-24

Unreleased

Decoder-only Transformer

Proprietary

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Specifications

Parameters: Unreleased
Architecture: Decoder-only Transformer
License: Proprietary
Context Window: 200,000 tokens
Max Output: 64,000 tokens
Training Data Cutoff: Aug 2025
Type: multimodal
Modalities: textimage

Benchmark Scores

Advanced Specifications

Model Family: Claude
Finetuned From: Claude 4
API Access: Available
Chat Interface: Available
Multilingual Support: Yes
Variants: claude-opus-4-5-20251101

Capabilities & Limitations

Capabilities: deep reasoningcomplex codingresearcheffort controlcomputer usevisionmultilingual
Known Limitations: higher latency than Sonnet and Haikuknowledge cutoff limits real-time data without tools
Notable Use Cases: deep researchcomplex system architecturescientific discoveryhigh-stakes decision making
Function Calling Support: Yes
Tool Use Support: Yes

Resources

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