Claude Opus 5 (high thinking mode) runs Anthropic's top-tier Opus model with an extended reasoning phase, providing deeper reasoning quality for complex coding, long-running agentic work, and professional knowledge tasks. It improves on Opus 4.8 in efficiency and alignment, making it well suited to the hardest tasks.
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Claude Opus 5 model is Anthropic's latest Opus-line model, released in July 2026, matching the top-tier Fable 5's intelligence on many tasks at Opus-tier pricing. It shows improved performance on coding, long-running agentic work, and professional knowledge tasks, with leading results on benchmarks such as Frontier-Bench and GDPval-AA.
Run in "high thinking" mode, it goes through an extended reasoning phase before responding, yielding deeper solution quality. On BuildersgateGG, this mode is used for accuracy-critical work like complex refactors, multi-step debugging, and design decisions. Compared to the previous generation, Opus 4.8, it also improves efficiency and alignment, making it less susceptible to misuse.
It is Anthropic's latest top-tier Opus model, matching flagship-level intelligence at Opus-tier pricing.
It runs an extended reasoning phase before responding, giving deeper solution quality on complex problems.
It improves efficiency and alignment, delivering better performance at the same price tier.
Accuracy-critical work such as complex refactors, multi-step debugging, and design decisions.