anthropic/claude-opus-4.5Claude Opus 4.5 is Anthropic’s proprietary AI model, released Nov 24, 2025. It costs $5/M input and $25/M output tokens, and handles a 200K-token context window. Its strongest use case is coding, where it ranks in the 64th percentile of the models Model Beat tracks.
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, 63.1% on Terminal-Bench.
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 Sep 17, 2026.