GPT Terra 6.1

Changes from previous version

Successor to GPT Terra 5.6. Terminal-Bench 4.0 at max rises from that version's published 21.5% to 50.3%. At medium effort, Agents' Last Exam v1 is 15 points higher at about one-third the charted cost. API list rates are $1/M input and $5/M output, with cache reads at $0.05/M. GPT-6.1 Terra Pro is the same checkpoint with reasoning mode set to pro, not a separate version.

Release Summary

GPT-6.1 generation of OpenAI's Terra tier for high-volume visual reasoning, computer use, and writing. Standard API rates are $1/M input, $0.05/M cached input, $1.25/M cache writes at 30-minute retention, and $5/M output. OpenAI describes those rates as 50% lower than GPT Terra 5.6 and GPT Sol 6.1. A measured price per task at max effort is $0.96; medium, the API default, is $0.17. Agents' Last Exam v1 at max is 60.0%, against 63.2% for Claude Opus 5.5. At medium effort it is 15 points above GPT Terra 5.6 at about one-third the charted cost. Terminal-Bench 4.0 at max is 50.3%, more than double that version's published 21.5%, and below GPT Sol 6.1 at 55.9%. Terminal-Bench-Science 0.1 at max is 58.3%, above GPT Sol 6.1 at 57.0% and within five points of Claude Opus 5.5 with fallbacks. Available as gpt-6.1-terra in the API, and in ChatGPT Work and Codex for Plus, Pro, Enterprise, and Edu. Not in Chat. 1.05M context, up to 922k input, 128k max output, knowledge cutoff June 1, 2026. Text, image, and PDF in, text out. Reasoning effort is none, low, medium (the default), high, xhigh, or max. Fast mode is 2x Standard. Prompts over 272K input tokens are billed at 2x input and cache rates and 1.5x output for the full request. Tool calling uses the Responses API. Uses the same safeguards stack as GPT Astra 6 and GPT Sol 6.1.

Timeline

Other GPT Terra versions