GPT-6.1 Terra

OpenAI's mid-tier Terra model, relaunched as GPT-6.1 Terra on Oct 26, 2026 at $1 input and $5 output per million tokens.

OpenAI · Frontier/foundation models · model

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Overview

Terra is the middle tier of OpenAI's Sol, Terra and Luna family. GPT-5.6 Terra was announced June 26, 2026 and reached general availability July 9, 2026 at $2.50/million input and $15/million output tokens, and was not carried into the September GPT-6 refresh. On October 26, 2026 OpenAI introduced GPT-6.1 Terra (API id gpt-6.1-terra), described as a significant step up with visual reasoning, computer use and clearer writing, at $1/million input, $0.05 cached input and $5/million output, which OpenAI says is 50% below GPT-5.6 Terra and GPT-6.1 Sol. OpenAI reports 50.3% on Terminal-Bench 4.0 at max effort versus 21.5% for GPT-5.6 Terra, and says it runs over three times faster than GPT-6 Astra and GPT-6.1 Sol; Sol and Astra remain better for the most complex coding. It is available to ChatGPT Plus, Pro, Enterprise and Edu users in ChatGPT Work and Codex, in the API, in GitHub Copilot and on Vercel AI Gateway. OpenAI says it meets the Critical cybersecurity threshold under its Preparedness Framework.

This is a sourced directory entry. Features and capabilities are reported in the linked sources; this entry does not document independent Aymorphic testing.

Key features

  • $1 input / $0.05 cached input / $5 output per million tokens (standard API)
  • Terminal-Bench 4.0: 50.3% at max effort versus 21.5% for GPT-5.6 Terra (OpenAI-reported)
  • Factuality error rate on OpenAI's error-inducing prompts: 53.6% to 16.7% at low effort, 4.3% at max
  • Over 3x faster task completion than GPT-6 Astra and GPT-6.1 Sol
  • Available in ChatGPT Work, Codex, the API, GitHub Copilot and Vercel AI Gateway
  • Context window not stated in the launch post

Use cases

  • Computer-use and desktop agent tasks at lower cost than Sol or Astra
  • Visual reasoning and document work where speed and price matter
  • Everyday coding and writing; Sol or Astra for the hardest coding tasks

Pricing

GPT-6.1 Terra: $1/million input tokens, $0.05/million cached input, $5/million output (standard API). Earlier GPT-5.6 Terra: $2.50 input, $15 output.

Pricing reflects the source record and may change. Confirm current terms with the provider.

Dates and sources

Released
26 Jun 2026
Record updated
27 Oct 2026
Record last checked
27 Oct 2026

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