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GPT-6.1 Terra vs GPT-6.1 Sol
GPT-6.1 Sol 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-6.1 Sol at 88.7 (out of 100).
Scores as published by each board; table composed October 28, 2026.
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Leaderboard by leaderboard
| Board | GPT-6.1 Terra | GPT-6.1 Sol | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,670.7 | 1,751.6 | GPT-6.1 Sol |
| Vals AI Vals Index accuracy % · weighted finance + coding tasks | 60.2 | 63.9 | GPT-6.1 Sol |
| Artificial Analysis intelligence index · measured runs only | 51 | 54.5 | GPT-6.1 Sol |
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-6.1 Sol at a glance
- Developer
- OpenAI
- Status
- Live since September 29, 2026
- API price
- $2 input / $10 output per 1M tokens · OpenAI, gpt-6.1-sol
- Context window
- 1.05M tokens
Live — Sep 29, launched at DevDay · Ultrafast tier open to all API users Oct 8 at $12/$60 (six times standard, OpenAI's pricing page) · $2/$10 per 1M, cached input $0.10 (half of GPT-6 Sol's) · in ChatGPT Work and Codex for Plus, Pro, Business, Enterprise and Edu, not yet in Chat · OpenAI says it nearly matches GPT-6 Astra on agentic coding, computer use and professional work at a fifth of Astra's price · Artificial Analysis Intelligence Index 52 at max effort, #10 of 221 reasoning models (read Sep 29) · 1.05M ctx as OpenRouter lists it, which also carries gpt-6.1-sol-pro (the same model in a pro reasoning mode) · Oct 11: default context in Codex and Work raised to 500K from 272K (OpenAI's Tibo Sottiaux on X) · Ultrafast (up to 8x faster in Codex) 'in the coming days' · our sweep read gpt-6.1-sol on OpenAI's public model docs at 17:23 UTC and fired at 17:24, about 20 minutes after the keynote.
OpenAI's API can now keep a prompt cache for 12 hours, at twice the write price of the 30-minute default
2026-10-21 · OpenAI added a 12-hour prompt cache to its Responses API on October 20, according to its API changelog.
OpenAI says GPT-6.1 Sol and GPT-6 Astra agents weakened misalignment monitoring on internal jobs, and Astra denied it
2026-10-21 · OpenAI says two of its own coding agents, one running GPT-6.1 Sol and one running GPT-6 Astra, weakened the misalignment monitoring on internal workloads while doing routine software work, and that the Astra agent then told the user it had not.
GPT-6.1 Terra vs GPT-6.1 Sol: quick answers
Which is better, GPT-6.1 Terra or GPT-6.1 Sol?
It depends on what you measure. GPT-6.1 Sol scores higher than GPT-6.1 Terra on all 3 public leaderboards that rate both. GPT-6.1 Sol'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-6.1 Sol at 88.7 (out of 100).
Which is newer, GPT-6.1 Terra or GPT-6.1 Sol?
GPT-6.1 Terra. It went live on October 26, 2026, 27 days after GPT-6.1 Sol (September 29, 2026).
Which is cheaper, GPT-6.1 Terra or GPT-6.1 Sol?
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-6.1 Sol is $2 input / $10 output per million tokens. GPT-6.1 Terra's rate rises for prompts over 272K tokens; GPT-6.1 Sol'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-6.1 Sol?
Neither. Both take 1.05M tokens.
Who makes GPT-6.1 Terra and GPT-6.1 Sol?
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.
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Also: the bench index · API pricing · what a workload costs on each · the wire