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Real-world results are in for Claude Sonnet 5.5 (High) by @AnthropicAI. It just landed #4 in Code Arena: WebDev with 1699 pts, and has reshaped the Pareto frontier with its cost efficiency! Claude Sonnet 5.5 (High) delivers nearly top performance at a blended $8 per Mtoken, reshaping the Pareto frontier! This model is 80% cheaper than both Claude Fable 5.1 (Max) in the #3 spot overall, and GPT-6 Astra (Max) at #2. See Pareto placement below. Overall, Claude Sonnet 5.5 (High) is a +159 pt improvement from Sonnet 5 (High) at #37 with 1540 pts. This gain compared to its previous variant also shows up across these key domains so far: - Reference-Based Design: #38 → #4 - Simulations: #37 → #4 - Gaming: #36 → #4 Congrats to @AnthropicAI on this release!