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Anthropic Launches Claude Opus 5 with 1M Token Context and Default Reasoning

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Anthropic released Claude Opus 5 on July 24, describing it as a step-change improvement over Claude Opus 4.8 rather than an incremental update, with the biggest gains in deep reasoning, agentic coding, and long-horizon tasks. The model features a 1 million token context window as both its default and maximum, along with 128k max output tokens, and has extended thinking enabled by default. Unlike its predecessor, Opus 5 automatically determines when and how much to think per turn, with users able to adjust effort across five levels ranging from low to max. Per-token pricing remains unchanged from Opus 4.8, and Anthropic claims the model approaches the capability of rival top-tier models at roughly half the cost. Claude Opus 5 launched simultaneously across the Claude API, AWS, Google Cloud, and Microsoft Foundry, and has replaced Opus 4.8 as the default model in Claude Code.

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