Anthropic announced a five‑fold increase in the context window for its Claude Sonnet 4 model, expanding capacity to 1 million tokens. The larger window lets the model handle extensive text—up to 2,500 pages or a full copy of War and Peace—and much larger code bases, improving its utility for enterprise customers across sectors such as coding, pharmaceuticals, retail, professional services, and legal services. The upgrade arrives as Anthropic competes with OpenAI, which recently released GPT‑5 and earlier offered a similar context window with GPT‑4.1. The new capability is initially available to select API customers, with broader rollout planned in the coming weeks.
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