How much does GPT-6.1 Terra cost?

GPT-6.1 Terra costs $1.00 per million input tokens and $5.00 per million output tokens, using the list price from OpenAI as of 9 Nov 2026. That is about $0.35 for 100 chats of about 1,000 tokens in and 500 tokens back. Confirm on the maker's site before you buy, because prices change.

What is the context window of GPT-6.1 Terra?

GPT-6.1 Terra has a context window of 922K tokens, roughly 692,000 words of text read at once. A single answer can be up to 128K tokens long.

Is GPT-6.1 Terra open source?

We list GPT-6.1 Terra as closed: it is used through its maker's apps or API and its weights are not published (Epoch AI lists its access as "API access").

How good is GPT-6.1 Terra compared with other AI models?

On the Epoch Capabilities Index, GPT-6.1 Terra scores 167.8 (likely range 164.9 to 171.2), which ranks 4 of 274 models we track. Scores close together are a tie in practice.

How does GPT-6.1 Terra compare with Gemini 4 Argon?

Gemini 4 Argon scores higher on 2 of 6 shared quality measures, GPT-6.1 Terra on 1. 3 measures are too close to call. GPT-6.1 Terra costs about 50% less than Gemini 4 Argon on a blended price of $2.00 against $4.00 per million tokens. See the full comparison for every measure.

How current are these numbers for GPT-6.1 Terra?

The newest data on this page is dated 9 Nov 2026. Scores come from Epoch AI and Arena, prices from the open LiteLLM price list.

AI Rankings

GPT-6.1 Terra: Score, Price and Context Window

Where GPT-6.1 Terra from OpenAI ranks, what it costs and how much text it can read, in plain numbers with the sources.

Data updated 9 Nov 2026

OpenAI
Closed weights
Released Oct 2026

Its score range overlaps with Claude Opus 5.5, the model just above it, so a small gap in rank is not a meaningful difference.

Best for

Demanding tasks: its overall Epoch score is in the top 10% of models we track.
Building web pages and small apps: its Arena web development rating is in the top 10%.

These lines are worked out from the numbers on this page, not from hands-on testing.

Key facts

Overall score: 167.8; Rank 4 of 274. Likely range 164.9 to 171.2.
Human preference: web pages: 1678; Rank 9 of 89. 3,626 votes, at the "Max" setting.
Price per million tokens: $1.00 in / $5.00 out; Blended $2.00. Cached input $0.05. List price from OpenAI, checked 9 Nov 2026.
Context window: 922K tokens; About 692,000 words at once. One answer up to 128K tokens.
Weights: Closed; Used through the maker's apps or API (Epoch AI: API access).

Features listed by the price list: Image input, PDF input, Tool use, Reasoning, Web search, Prompt caching, Structured output.

We do not have an Arena human-vote rating for GPT-6.1 Terra yet. It is shown as "Not measured" rather than guessed.

Try itChatGPT in our AI tools directoryOpenAI's AI assistant for writing, coding, research, file analysis, and connected work across chats and projects.

How GPT-6.1 Terra stacks up

Each strip shows every model we track as faint bars. The dot is this model. Better is always to the right, even for price.

GPT-6.1 Terra compared with all models we trackOverall capability: 167.8. Better than 98% of the other 273 models. Human preference: web pages: 1678. Better than 90% of the other 88 models. Price: $2.00 per 1M. Cheaper than 35% of the other 206 priced models. Context window: 922K tokens. Larger context window than 65% of the other 204 models.

Overall capability167.8
Better than 98% of the other 273 modelsTop 10%
Epoch Capabilities Index: one score that combines many tests.
Human preference: web pages1678
Better than 90% of the other 88 modelsTop 10%
How often people pick the web pages and small apps it builds on Arena.
Price$2.00 per 1M
Cheaper than 35% of the other 206 priced models
Blended price per million tokens. Lower is better, so the cheapest models sit on the right.
Context window922K tokens
Larger context window than 65% of the other 204 modelsUpper half
How much text it can read at once. Bigger suits long documents.

Compared with the other published models that have each measure. Data updated 9 Nov 2026.

Where GPT-6.1 Terra ranks

Leaderboards it appears on, best placing first.

See all leaderboards

Test results

Each test checks one kind of skill. Place shows where it stands among the models that took that test.

OTIS Mock AIME
Maths competition problems in the style of the US AIME exam, from the 2024 and 2025 sets. Every answer is a whole number.
100.0%
Place 1 of 178
tied with 12 others
FrontierMath (Tiers 1-3)
Original, very hard maths problems written by mathematicians. Each has an exact answer and the problems are kept private so models cannot have memorised them. This is the Tiers 1 to 3 set, version 2.
90.9%
Place 4 of 90
GPQA Diamond
Very hard multiple-choice science questions in biology, physics and chemistry, written by experts and designed so a quick web search does not give the answer.
94.3%
Place 9 of 186
tied with 1 other
SimpleQA Verified
Short factual questions that each have one correct answer. It measures how often a model gets facts right.
57.3%
Place 19 of 85

What it costs in everyday terms

List prices turned into amounts you can picture. Real bills depend on how you use it.

100 chats: $0.35; Cost of 100 chats assumes each chat sends 1,000 tokens (about 750 words) and gets 500 tokens (about 375 words) back.
A 300-page book: $0.10; Cost to read a 300-page book assumes about 100,000 input tokens and no reply. A real book varies with page size and language.
Blended price: $2.00 per 1M; Three parts input to one part output. Our own calculation for comparing models.

Compare GPT-6.1 Terra

Side-by-side pages for the closest rivals.

Similar models

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Questions about GPT-6.1 Terra

How much does GPT-6.1 Terra cost?: GPT-6.1 Terra costs $1.00 per million input tokens and $5.00 per million output tokens, using the list price from OpenAI as of 9 Nov 2026. That is about $0.35 for 100 chats of about 1,000 tokens in and 500 tokens back. Confirm on the maker's site before you buy, because prices change.
What is the context window of GPT-6.1 Terra?: GPT-6.1 Terra has a context window of 922K tokens, roughly 692,000 words of text read at once. A single answer can be up to 128K tokens long.
Is GPT-6.1 Terra open source?: We list GPT-6.1 Terra as closed: it is used through its maker's apps or API and its weights are not published (Epoch AI lists its access as "API access").
How good is GPT-6.1 Terra compared with other AI models?: On the Epoch Capabilities Index, GPT-6.1 Terra scores 167.8 (likely range 164.9 to 171.2), which ranks 4 of 274 models we track. Scores close together are a tie in practice.
How does GPT-6.1 Terra compare with Gemini 4 Argon?: Gemini 4 Argon scores higher on 2 of 6 shared quality measures, GPT-6.1 Terra on 1. 3 measures are too close to call. GPT-6.1 Terra costs about 50% less than Gemini 4 Argon on a blended price of $2.00 against $4.00 per million tokens. See the full comparison for every measure.
How current are these numbers for GPT-6.1 Terra?: The newest data on this page is dated 9 Nov 2026. Scores come from Epoch AI and Arena, prices from the open LiteLLM price list.

Where this data comes from

Epoch AI: Benchmark data: Epoch AI, 'Capabilities & benchmarking', epoch.ai/benchmarks (CC BY 4.0). We match models across sources, rank them and show them in charts. Scores are not changed. Epoch AI does not endorse this site.
Arena (formerly LMArena): Human-preference ratings: Arena (arena.ai) leaderboard dataset, CC BY 4.0. We keep the latest published ratings, match them to models from other sources and rank them. Ratings are not changed. Arena does not endorse this site.
LiteLLM model price list: Prices and context windows: LiteLLM model price list (github.com/BerriAI/litellm, MIT licence). We use the model maker's own price entry when there is one. Prices change often, so always confirm on the maker's site before you buy.

Newest data on this page: 9 Nov 2026. Prices are list prices and change often, so confirm on the maker's site before you buy. Sponsors never change a score or an order. How we calculate this · Report a mistake