Model · OpenAI · Text

GPT-6.1 Terra

A fast, efficient GPT-6 model for visual reasoning, precise computer use, and clear, natural writing. Priced between GPT-6 Luna and GPT-6.1 Sol.

Modality: Text
License: Proprietary (Proprietary)
Context window: 1,050,000 tokens 1.05M-token context (922k max input) with 128k max output. Knowledge cutoff 2026-06-01. Prompts over 272k input tokens cost 2x input and cache rates and 1.5x output for the whole request. Reasoning effort runs none / low / medium (default) / high / xhigh / max.
Released: October 26, 2026
Last verified: October 28, 2026
Runs locally: No
Also handles: vision, reasoning, code

Strengths

Built for visual reasoning, precise computer use, and clear writing at mid-tier pricing ($1 input / $5 output per MTok; $0.05 cached input)
Newest knowledge cutoff in the GPT-6 line (2026-06-01), with a 1.05M-token context and 128k max output
Full hosted tool set in the Responses API — web search, file search, image generation, code interpreter, hosted shell, apply patch, skills, computer use, MCP, and tool search
Supports the `none` reasoning effort; Batch and Flex at 50% off

Long prompts cost more — over 272k input tokens the whole request is billed at 2x input and 1.5x output
Tool calling requires the Responses API
No fine-tuning or predicted outputs; text and image input only — no audio or video
Not available for Realtime, Assistants, embeddings, image generation, speech, or transcription
Closed weights — API and product only

Where	Type	Notes
OpenAI API	hosted-api	API key required

Oct 28, 2026 — Initial entry. Released 2026-10-26 per OpenAI's API changelog; $1 input / $5 output per MTok, 1.05M-token context and 128k max output per the gpt-6.1-terra model docs.