← comparisons · head to head
GPT-6.1 Terra vs GPT-6 Astra
GPT-6 Astra scores higher than GPT-6.1 Terra on all 3 public leaderboards that rate both. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, GPT-6.1 Terra is at 75 and GPT-6 Astra at 92 (out of 100).
Scores as published by each board; table composed October 28, 2026.
Get the next launch alert, free →
Leaderboard by leaderboard
| Board | GPT-6.1 Terra | GPT-6 Astra | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,670.7 | 1,773.5 | GPT-6 Astra |
| Vals AI Vals Index accuracy % · weighted finance + coding tasks | 60.2 | 65 | GPT-6 Astra |
| Artificial Analysis intelligence index · measured runs only | 51 | 56.9 | GPT-6 Astra |
Raw scores are each board's own scale, so compare within a row, not across rows. Full table: the bench index.
GPT-6.1 Terra at a glance
- Developer
- OpenAI
- Status
- Live since October 26, 2026
- API price
- $1 input / $5 output per 1M tokens · OpenAI, gpt-6.1-terra
- Context window
- 1.05M tokens
Live — Oct 26 · $1 / $5 per MTok, cached input $0.05, cache writes $1.25 (OpenAI's model page) · 1.05M ctx / 128K out · knowledge cutoff Jun 1, 2026 · reasoning, text and image in · GPT-5.6 Terra lists at $2 / $12 on OpenRouter · first seen Oct 16-19 as the judge model in Microsoft's dotnet/efcore eval configs (PR #39217) · our sweep caught gpt-6.1-terra at 17:52 UTC and fired at 17:53 · OpenRouter added openai/gpt-6.1-terra (18:13 UTC) and openai/gpt-6.1-terra-pro (18:15) the same evening, both at $1 / $5 and 1.05M ctx · scored on LMArena, Vals and Artificial Analysis by Oct 28.
GPT-6.1 Terra is live in OpenAI's API at $1 / $5 per million tokens, under GPT-5.6 Terra's $2 / $12
2026-10-26 · OpenAI's GPT-6.1 Terra is live in its API. Our radar saw the gpt-6.1-terra id at 17:52 UTC on October 26 and fired the alert at 17:53, before OpenRouter listed it.
GPT-6.1 Terra turns up again, as a cheaper reviewer in a GitHub engineer's Copilot workflow
2026-10-25 · A second public repo now calls GPT-6.1 Terra, a model OpenAI has not announced. On October 24 at 03:48 UTC, Nate Finch, whose GitHub profile lists his company as GitHub, merged a pull request in his own public repo, natefinch/council4, that moves every review step from gpt-6.1-sol to gpt-6.1-terra at high effort.
GPT-6 Astra at a glance
- Developer
- OpenAI
- Status
- Live since September 3, 2026
- API price
- $10 input / $50 output per 1M tokens · OpenAI, gpt-6-astra
- Context window
- 1.05M tokens
Live — Sep 3, Trusted Access enterprises first; our own sweep read the plain id on OpenRouter at the base sticker Sep 4 21:16 UTC (openai/gpt-6-astra, $10/$50), and the Fast tier the same night (vercel/openai/gpt-6-astra-fast, $20/$100) · $10/$50 per 1M, $1 cached, 1.05M ctx / 128K out · AA Coding Agent Index 67 (≈ Opus 5, Fable 5), Intelligence Index 61 (= GPT-5.6 Sol, 5 below Fable 5.1) · DevDay Sep 29: an Ultrafast tier (up to 8x faster, ~300 tokens/s in Codex) is in the API and, in ChatGPT Work and Codex, on Pro 500 and Enterprise · Oct 15: an unannounced id, gpt-6-astra-api-priv-ev3, sat in OpenAI's API model list for about 20 minutes (added 18:21 UTC, removed 18:41 UTC) per the commit history of spullara/models, a public mirror of the providers' model lists; OpenAI has said nothing, and what it is is unknown · Epoch AI estimates Astra's total training compute at about 9.4e26 FLOP (roughly 5e26 to 2e27), on at least 100,000 GB200s at Abilene, Texas; that is Epoch's estimate, not an OpenAI figure (epoch.ai data, read Oct 15).
CritPt v2: GPT-6 Astra leads the research-physics benchmark at 83.1%, ahead of GPT-6.1 Sol and Opus 5.5
2026-10-22 · CritPt, a benchmark of unpublished, research-level physics problems, released version 2 on October 22 after four months of expert review, and GPT-6 Astra tops its new leaderboard at 83.1% average accuracy.
An unannounced OpenAI id, gpt-6-astra-api-priv-ev3, sat in OpenAI's model list for 20 minutes, then came down
2026-10-15 · An OpenAI model id that has never been announced, gpt-6-astra-api-priv-ev3, appeared in OpenAI's API model list on October 15 and was gone about 20 minutes later. We read it in the history of spullara/models, a public GitHub repo that copies the model lists of the big AI APIs on a schedule.
GPT-6.1 Terra vs GPT-6 Astra: quick answers
Which is better, GPT-6.1 Terra or GPT-6 Astra?
It depends on what you measure. GPT-6 Astra scores higher than GPT-6.1 Terra on all 3 public leaderboards that rate both. GPT-6 Astra's widest lead is on LMArena. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, GPT-6.1 Terra is at 75 and GPT-6 Astra at 92 (out of 100).
Which is newer, GPT-6.1 Terra or GPT-6 Astra?
GPT-6.1 Terra. It went live on October 26, 2026, 53 days after GPT-6 Astra (September 3, 2026).
Which is cheaper, GPT-6.1 Terra or GPT-6 Astra?
GPT-6.1 Terra is cheaper on both input and output. On each vendor's own API, GPT-6.1 Terra is $1 input / $5 output per million tokens and GPT-6 Astra is $10 input / $50 output per million tokens. GPT-6.1 Terra's rate rises for prompts over 272K tokens; GPT-6 Astra's rate rises for prompts over 272K tokens. Prices as published in the models.dev catalog, as of 2026-10-27.
Which has the bigger context window, GPT-6.1 Terra or GPT-6 Astra?
Neither. Both take 1.05M tokens.
Who makes GPT-6.1 Terra and GPT-6 Astra?
Both are from OpenAI.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed October 28, 2026). Boards measure different things, so raw scores are only comparable within a row.
More comparisons
Hear when the next one drops. Free.
Free: a Chrome push and an email about 15 minutes after a new model answers on a public API. Members get a text or a phone call the moment a launch is confirmed.
- Free forever
- No card
- Unsubscribe in one click
Also: the bench index · API pricing · what a workload costs on each · the wire