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=== Claude 1 / Claude Instant (March 2023) === Claude and '''Claude Instant''' were released in March 2023, initially only to Anthropic-approved enterprise partners through API access.<ref name="anthropic-wiki"/> Claude 1 directly competed with GPT-4 in reasoning and instruction-following tasks. Claude Instant was a faster, lower-cost variant suited to high-throughput applications. Claude 1 supported a context window of approximately 9,000 tokens. Key characteristics: * Constitutional AI alignment baked into training * Emphasis on reduced harmful outputs relative to contemporary models * Enterprise-only access via Anthropic API * Claude 1 was deprecated September 2024 and retired November 2024.<ref name="models-explained">justainews, ''Claude Models Explained'', 2025.</ref>
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