anthropic/claude-opus-4.5Claude Opus 4.5 is Anthropic’s proprietary AI model, released Nov 24, 2025. It scores 152 on the Epoch Capabilities Index, costs $5/M input and $25/M output tokens, and handles a 200K-token context window.
Claude Opus 4.5 is Anthropic’s frontier reasoning model optimized for complex software engineering, agentic workflows, and long-horizon computer use.
Scores on standardized evaluations. Higher is better — and rank shows where Claude Opus 4.5 lands among all models tracked on Model Beat.
Abstract visual reasoning
Harder abstract reasoning
Graduate-level scientific reasoning
Frontier of human expert knowledge
Broad expert knowledge
Common-sense trick questions
Factual accuracy & hallucination
Novel ML problem-solving
Code performance optimization
Contamination-free coding
Scientific research coding
Real GitHub issue resolution
Human-rated web development
Olympiad-qualifier math
Research-level math problems
Hardest research math
Multi-step agentic tasks
Economically valuable work
Autonomous task length
Command-line agentic tasks
Tool-agent-user reliability
Claude Opus 4.5 is Anthropic’s frontier reasoning model optimized for complex software engineering, agentic workflows, and long-horizon computer use.
Claude Opus 4.5 is an AI model developed by Anthropic, part of the Claude family, released Nov 24, 2025.
Claude Opus 4.5's list price from Anthropic is $5 per million input tokens and $25 per million output tokens.
Claude Opus 4.5 supports a context window of up to 200K tokens.
On standardized evaluations tracked by Epoch AI, Claude Opus 4.5 scores 89.5% on MMLU-Pro, 87.1% on LiveCodeBench, 63.7% on WeirdML.
Claude Opus 4.5 is a proprietary model (API access), available through its provider's API rather than as a downloadable open-weight model.
Benchmark data from Epoch AI (CC BY) and Artificial Analysis; pricing, specs & descriptions from OpenRouter. Data updated Nov 12, 2026.