GPT-6.1 Terra (Max) by OpenAI

GPT-6.1 Terra (Max) by OpenAI: model card

What it is

GPT-6.1 Terra (Max) is a agentic model from OpenAI. It ranks #8 of 59 on its Arena board, which puts it in the top ten. The model runs multi-step tasks in an environment: reads files, runs commands, uses tools.

Key numbers: net improvement 11.96%; sessions 25 197; price $1 / $5 per 1M tokens (input / output); licence Proprietary.

What this card does not contain: our own test runs, latency measurements, user reviews or taste judgements. Everything stated here comes from the public Arena.ai leaderboard and specs published by the developer. A missing parameter is marked as not listed rather than guessed.

Leaderboard numbers

• Rank: #8 of 59
• Net improvement: 11.96%
• Sessions: 25197
• Price: $1 / $5 per 1M tokens (input / output), as listed on Arena
• Licence: Proprietary

Who it is for

• Teams choosing a default model for a product and wanting the whole board, not just the top row.
• Anyone comparing price per token with rank, looking for the point where a cheaper model stops failing.

How to read these numbers

An Arena score comes from blind pairwise comparisons, not from an absolute quality scale. A few points between neighbouring rows is often inside the error bars, so the top of a board is better read as ‘roughly one tier’. Price, context and licence are stated specs and do not feed the score.

What to check yourself

• Whether the model is available in your region and whether access terms changed since the snapshot.
• Whether you really need the stated context: attention quality on long input is often lower.
• How price behaves on your prompt mix: the input/output ratio can matter more than the headline figure.

Source

• Agent Arena leaderboard at Arena.ai
• Developer page: OpenAI

Leaderboard snapshot: 11 November 2026.

_Prepared with AI assistance from the public Arena.ai leaderboard. This is not first-hand experience with the model and not an independent review._