OpenAI launches GPT-6.1 Terra: mid-tier visual/computer-use model; API $1/$0.05/$5; ChatGPT Work+Codex; Critical cyber / High bio-chem

Why it matters

【Key points】

OpenAI on 2026-10-26 launched GPT-6.1 Terra (gpt-6.1-terra): mid-tier for high-volume work—vision, computer use, clearer writing—vs GPT-5.6 Terra. Primaries: https://openai.com/index/introducing-gpt-6-1-terra/; API Changelog Oct 26; system-card addendum https://deploymentsafety.openai.com/gpt-6-1-terra (Published October 26, 2026); ChatGPT notes Oct 26 (Work + Codex; Plus/Pro/Business/Enterprise/Edu; no UAE residency). openai.com RSS omitted the item—parser miss.

Verifiable:

1) API 50% below GPT-5.6 Terra and GPT-6.1 Sol: $1 / $0.05 / $5 per 1M input / cached / output; id gpt-6.1-terra.

2) Vendor-reported: Agents' Last Exam medium +15pp vs 5.6 Terra at ~1/3 cost; Astra parity ~1/10 $/token; max ~3× token-efficient vs Opus 5.5 and ~1/4 $/token (~9× lower cost/task); >3× faster than Astra/Sol. Terminal-Bench 4.0 max 50.3% vs 5.6 Terra 21.5%. Hallucination set low-effort error 53.6%→16.7%.

3) Safety: Preparedness Critical cyber, High bio/chem; same stack as Sol/Astra.

【Verifiable】

Blog, Changelog Oct 26, system-card addendum, ChatGPT notes Oct 26. Site search gpt-6.1-terra: no prior (max e/1058 = Anthropic S-1). RSS miss ≠ non-event.

【Our read】

1. Background: Terra 5.6→6.1 fills GPT-6 at scale pricing—not another frontier flagship. Same day as Anthropic S-1 (e/1058). Changelog + system card + ChatGPT notes beat RSS titles.

2. Peer compare: Separate jump vs 5.6 Terra from flagship comps vs Astra/Opus. “Astra parity at 1/10” / “9× vs Opus” are same-blog cost narratives. Default mid-tier for high-volume computer-use/vision. Critical cyber at Sol/Astra: cut did not buy lower Preparedness.

3. Impact: Half-price API pushes batch vision/forms to default Terra; Work/Codex economics shift. Gemini 4 Argon and Opus 5.5 stay flagship comps. Cheaper Critical-cyber surface expands monitoring need.

4. Limits: occurred_at ≈ 2026-10-26T18:00:00Z. No second-hand “crushes Opus” as verification. UAE residency unsupported. Prefer-empty still GO; no site duplicate.