Claude Opus 5
Anthropic's mid-tier model. Long-context specialist with 1M window.
Scores by test
Methodology →What you need to know
Claude Opus 5 is a high-reasoning model optimized for complex architectural and analytical tasks. It demonstrates exceptional proficiency in strategic analysis, creative problem solving, and structured output, all scoring 5/5 internally. Its capacity for high-level logic is further validated by a 98.9% score on the AIME 2025 benchmark, making it one of the most capable models for mathematical and logical rigor.
The model provides a massive 1M token context window with perfect internal scores for long-context retrieval and faithfulness. However, this performance comes at a premium. With a blended cost of $20.00/MTok and output costs reaching $25.00/MTok, it is an expensive option compared to mid-tier models, positioning it as a tool for high-value tasks rather than high-volume automation.
Technical limitations are evident in safety calibration, where it scores a 1/5, and basic classification, where it performs moderately at 3/5. While it excels at agentic planning and multilingual tasks, its tool calling is slightly less reliable than its core reasoning capabilities.
Use this model if your project requires deep strategic reasoning, complex mathematical problem solving, or processing massive datasets within a single prompt. Skip this model if you are operating on a tight budget, require strict safety guardrails, or need a model primarily for simple text classification.
Strengths — Top 3
Relative weaknesses — Bottom 3
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