Opus 5.5 Outperforms Fable 5.1 in Pokemon Red Agent Benchmark
September 26, 2026
In a Pokemon Red milestone benchmark, Opus 5.5 completed the Brock gym challenge in 271 turns for $8.44. In contrast, Fable 5.1 required 554 turns at a cost of $99.76, failing due to suboptimal starter selection and combat inefficiency.
HOW THIS AFFECTS YOU
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builderYou can use game-state-to-RAM benchmarks to test long-horizon reasoning and agentic cost-efficiency.
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researcherThis highlights the performance gap in reasoning-based decision making versus pure pattern matching in multimodal agents.