GPT-6.1 Terra (Reasoning)

by OpenAI

GPT-6.1 Terra (Reasoning) is a reasoning model from OpenAI, released on October 26, 2026. It has a 1.1M-token context window and can generate up to 128K output tokens. API pricing is $1 per 1M input tokens and $5 per 1M output tokens. It ranks #34 of 247 models by Intelligence Score with a score of 47.6.

GPT-6.1 Terra is OpenAI's fast, efficient GPT-6.1 model for visual reasoning, precise computer use, and clear, natural writing, priced 50% below GPT-5.6 Terra and GPT-6.1 Sol. The API model id is gpt-6.1-terra. It accepts text and image input with text output, supports none, low, medium (API default), high, xhigh, and max reasoning effort, and provides a 1,050,000-token context window with up to 128,000 output tokens. Use the Responses API for tool calling; Chat Completions is supported without tool calling. Responses API tools include web and file search, image generation, code interpreter, hosted shell, apply patch, skills, computer use, MCP, and tool search; it also supports streaming, function calling, and structured outputs. Standard per-million-token pricing is $1 input, $0.05 cached input, $1.25 cache writes (30-minute retention rate; 12-hour retention is $2.50), and $5 output. Prompts above 272K input tokens cost 2x input/cache and 1.5x output across the full request. Batch and Flex cost 50% of Standard; Fast costs 2x. Regional processing adds 10% where available. Launch benchmarks are OpenAI-reported; effort and evaluation variants are recorded with each score.

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