GPT-5 is the previous flagship reasoning model in the GPT-5 family, built for coding and agentic tasks with configurable reasoning effort (minimal, low, medium, high). It supports a 400,000-token input context with 128,000 output tokens, text and image inputs, and exposes streaming, function calling, structured outputs, and tool integrations including web search, file search, image generation, code interpreter, and MCP. OpenAI recommends GPT-5.1 for new workloads.
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