This is a same-week, cross-vendor comparison: Google announced Gemini 4 Carbon on October 28, 2026 observed; OpenAI announced GPT-6.1 Terra on October 26, 2026 observed — two days earlier. Both are frontier-family names from the two biggest labs, announced inside four days of each other, which is exactly why comparison searches spike: people want to know which launch mattered more. The honest answer is that a launch-week comparison can settle positioning, access and announced pricing — and nothing else. No independent head-to-head between these two exists as of our November 1, 2026 capture, and we will not manufacture one. Labels: vendor claim / observed / analysis.
The two announcements are not symmetric in our capture: we pulled Google's Carbon post directly observed, while OpenAI's announcement page blocks our direct fetch, so the Terra column below is limited to title-level facts — vendor, date, and the official announcement title observed. Where a cell says "not captured," that is a statement about our sources, not a fact about the model analysis.
| Gemini 4 Carbon (Google) | GPT-6.1 Terra (OpenAI) | |
|---|---|---|
| Announced | October 28, 2026 observed | October 26, 2026 observed |
| Official announcement | "Gemini 4 Carbon: our next frontier model" on Google's blog observed | "Introducing GPT-6.1 Terra" on OpenAI's site observed |
| Stated positioning | "Our strongest model with state-of-the-art cybersecurity and long horizon capabilities" vendor claim | Not captured first-hand by us — details await official documentation analysis |
| Announced pricing | $2/M input, $10/M output, cached input 95% off (introductory, same as Argon) vendor claim | Not captured first-hand by us — check OpenAI's pricing page analysis |
| Availability | Phased: cyber-defender subset → Fairwind Program partners → broader surfaces vendor claim | Not captured first-hand by us analysis |
| Published benchmarks | Google-reported slate (SEC-bench Pro 88.2%, ExploitGym 54.8%, CWE-bench 71.0%, AAII v5.0 #1 at 59) vendor claim | None captured by us analysis |
| Independent head-to-head | Does not exist as of November 1, 2026 — any "X beats Y" claim for this pairing is unverified analysis | |
A head-to-head requires the same tasks, the same harness, published methodology, and access to both models. None of that exists for Carbon vs Terra as of our capture analysis. Benchmarks pending — including the ones each vendor publishes on its own: vendor-side numbers are claims to track, not comparisons, because each vendor picks its own tasks and settings analysis. If you must decide this month, decide on access and workload fit; if you can wait, wait for replication.
They are same-week, not same-family: Carbon is Google DeepMind's Gemini 4 flagship tier observed; Terra is an OpenAI GPT-6.1 name observed. Generation is a marketing calendar, not a capability ranking analysis.
Because of sourcing, not importance: OpenAI's announcement page blocks our direct fetch, so we only carry title-level facts (vendor, date, announcement title) observed. We would rather show an honest gap than fill it with rumor analysis.
The one you can access that passes your tasks at an acceptable cost. Run the same three workloads on both when keys exist, count failures, and price the month — our API cost calculator is built for exactly that analysis.
When independent evaluators get both models under the same harness and publish methodology — realistically weeks after broad availability for both. Benchmarks pending until then; this page will age with the evidence analysis.
This page is descriptive and independent, built from a direct capture of Google's announcement and title-level facts for OpenAI's, last reviewed November 1, 2026. Not affiliated with Google or OpenAI. "Gemini", "GPT" and related names are trademarks of their respective owners; vendor claims are labeled and not independently verified.