Claude Opus 5 (Fast)
Anthropic's mid-tier model. Long-context specialist with 1M window.
Scores by test
Methodology →What you need to know
Claude Opus 5 (Fast) is engineered for high-complexity cognitive tasks, excelling in strategic analysis, agentic planning, and creative problem solving. Its primary technical advantage is a massive 1M token context window paired with perfect internal scores for long-context retrieval, faithfulness, and tabular data processing. This makes it a specialized tool for analyzing vast datasets or maintaining deep persona consistency over extended interactions.
The model carries a significant price premium, with a blended cost of $40.00 per million tokens. Given its rank of 29 out of 130 models, the cost is high relative to its overall standing. While it delivers top-tier performance in reasoning and multilingual capabilities, developers are paying a premium for the specific combination of a large context window and high-level agentic planning.
There is a critical failure in safety calibration, scoring 1/5. This indicates the model lacks the internal guardrails found in more conservative models and may produce unfiltered or risky outputs. Additionally, while strong, its structured output and classification capabilities are slightly lower than its reasoning scores, suggesting it is better suited for open-ended analysis than rigid data extraction.
Use this model if your application requires complex strategic reasoning, agentic autonomy, or the processing of massive documents where faithfulness is non-negotiable. Skip this model if you are on a tight budget, require strict safety filtering, or need a model optimized primarily for simple classification and structured data formatting.
Strengths — Top 3
Relative weaknesses — Bottom 3
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