OpenAI launches GPT-6.1 Terra with 1.05M context and 50% lower API pricing

OpenAI has released GPT-6.1 Terra, a multimodal model built for visual reasoning, desktop computer use and writing. On 26 October 2026, the model rolled out to Plus, Pro, Enterprise and Edu subscribers in ChatGPT Work and Codex, and to developers in the OpenAI API as gpt-6.1-terra. It supports a 1,050,000-token context window, up to 128,000 output tokens, a 1 June 2026 knowledge cutoff and six reasoning effort levels from none to max through the Responses API.

Standard API pricing is $1 per million input tokens, $0.05 per million cached input tokens and $5 per million output tokens, which is 50% lower than both GPT-5.6 Terra and GPT-6.1 Sol. Standard cache writes cost $1.25 per million tokens for 30-minute retention and $2.50 for 12-hour retention, while prompts exceeding 272k input tokens are billed at twice the input and cache rate and 1.5 times the output rate. Batch and Flex processing cut standard prices by 50%, whereas Fast mode doubles them.

Interactive benchmark charts on the launch page cannot be saved as static images, but across all evaluations GPT-6.1 Terra outperforms GPT-5.6 Terra while running more than three times faster than GPT-6 Astra and GPT-6.1 Sol. On Agents’ Last Exam, medium-effort GPT-6.1 Terra scores 15 percentage points above GPT-5.6 Terra at roughly one-third the cost and matches GPT-6 Astra at one-tenth the price per token; at max effort, it uses less than one-third the tokens of Claude Opus 5.5 at one-fourth the per-token price for roughly nine times lower cost per task. Under OpenAI’s Preparedness Framework, the model meets the Critical cybersecurity threshold.

Key numbers

• Context and output: 1,050,000 input tokens and 128,000 max output tokens
• Standard API price: $1 input, $0.05 cached input and $5 output per million tokens
• Terminal-Bench 4.0: 50.3% at maximum reasoning effort, up from 21.5% on GPT-5.6 Terra
• Internal factuality error rate: 16.7% at low effort (down from 53.6%) and 4.3% at max effort