Claude Fable 5 leads AI performance leaderboard but is most expensive

A new evaluation called gdpval-aa v2 measures AI model performance on real-world tasks, using an Elo rating system anchored to a human baseline. Anthropic's Claude Fable 5, Sonnet 5, and Opus 4.8 models secured the top three positions, outperforming models like Grok 4.5, GLM-5.2, and GPT-5.5. While the Claude models lead in raw performance, they are also the most expensive, with Grok 4.5 noted for offering a strong balance of performance and cost. AI

IMPACT Establishes a new benchmark for real-world task performance and highlights the trade-off between model capability and cost.

RANK_REASON New evaluation benchmark and performance comparison of multiple AI models. [lever_c_demoted from research: ic=1 ai=1.0]

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• Claude Fable 5
• Claude Opus 4.8
• Claude Sonnet 5
• DeepSeek V4 Pro
• gdpval-aa v2
• GLM-5.2
• GPT-5.5
• Grok 4.5
• Mimo-v2.5-pro

• model release

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