Is GPT-6.1 Terra better than o3?

On accuracy they are statistically tied: GPT-6.1 Terra scored 73.8% and o3 72.5% on the same 80 questions from open datasets. Similar accuracy; GPT-6.1 Terra costs less per question.

Which is cheaper, GPT-6.1 Terra or o3?

GPT-6.1 Terra is cheaper: $0.0013 per question as billed, against $0.0088. List prices: GPT-6.1 Terra $1 in / $5 out, o3 $2 in / $8 out per million tokens.

Which is faster, GPT-6.1 Terra or o3?

o3 is faster at 163 output tokens per second, against 122. Time to first token: 2.4 s for GPT-6.1 Terra, 1.2 s for o3.

Which has the larger context window, GPT-6.1 Terra or o3?

GPT-6.1 Terra, with 1.1M tokens against 200k.

Head to head · tested 27 Oct 2026

GPT-6.1 Terra vs o3: accuracy, speed and price

Similar accuracy; GPT-6.1 Terra costs less per question.

OpenAIGPT-6.1 Terra73.8% score · #18$0.0013 per question122 tok/s

OpenAIo372.5% score · #21$0.0088 per question163 tok/s

Verdict

Built from the measurements below

Accuracy is too close to call: GPT-6.1 Terra scored 73.8% and o3 72.5% on the same 80 questions, a gap within what chance alone could produce.
GPT-6.1 Terra is 6.9× cheaper per question as billed ($0.0013 vs $0.0088), reasoning tokens included.
o3 generates text 1.3× faster: 163 tokens per second against 122.
o3 starts answering sooner: 1.2 s to the first token, against 2.4 s for GPT-6.1 Terra.
GPT-6.1 Terra accepts more context: 1.1M tokens against 200k.

Which should you choose?

Choose GPT-6.1 Terra for the lower cost per correct answer ($0.0017 against $0.012), shorter outputs (about 195 tokens per question against 1,025) and a 1.1M-token context window. Choose o3 for faster streaming and a quicker first token. The widest subject gap is in law: o3 answered 5 of 6 correctly, GPT-6.1 Terra 3 of 6. With so few questions per subject, treat this as a lead to test on your own prompts, not a result.

Accuracy gap +1.3 points (z = 0.18). A winner is called only when z is at least 1.96, the usual 95% threshold. Speed, latency and price need a 10% margin.

Head to head

Same questions, same prompt, same API

Measure	GPT-6.1 Terra	o3	Edge
Verification scoreHigher is better	73.8%	72.5%	Too close to call
Cost per questionLower is better	$0.0013	$0.0088	GPT-6.1 Terra
Output speedHigher is better	122	163	o3
Time to first tokenLower is better	2.4 s	1.2 s	o3
End-to-end response timeLower is better	5.8 s	3.9 s	o3
Tokens per questionLower is better	195	1,025	GPT-6.1 Terra
Context windowHigher is better	1.1M	200k	GPT-6.1 Terra

Side by side

Bars are scaled to the larger of the two values. The winner on each measure is marked in bold.

Every measure

GPT-6.1 Terra first, o3 second

Verification scorehigher is better

GPT-6.1 Terra73.8%

o372.5%

Cost per questionlower is better

GPT-6.1 Terra$0.0013

o3$0.0088

Output speedhigher is better

GPT-6.1 Terra122

o3163

Time to first tokenlower is better

GPT-6.1 Terra2.4 s

o31.2 s

End-to-end response timelower is better

GPT-6.1 Terra5.8 s

o33.9 s

Tokens per questionlower is better

GPT-6.1 Terra195

o31,025

Context windowhigher is better

GPT-6.1 Terra1.1M

o3200k

Score vs. cost per question

Both models in color, every other model in grey

Results by subject and dataset

Questions answered correctly. Small samples: a gap of one or two questions is noise.

Subject	Questions	GPT-6.1 Terra	o3
Science	30	26/30	23/30
Engineering	15	9/15	8/15
Medicine	11	6/11	7/11
Economics	9	7/9	7/9
Law	6	3/6	5/6
Humanities & social science	9	8/9	8/9
SuperGPQA dataset	50	33/50	30/50
MMLU-Pro dataset	30	26/30	28/30

Specifications and pricing

From OpenRouter's catalogue, plus the leaderboard's test dates

Specification	GPT-6.1 Terra	o3
Creator	OpenAI	OpenAI
Released	26 Oct 2026	16 Apr 2025
Weights	—	—
Reasoning	Yes	Yes
Input	file, image, text	image, text, file
Output	text	text
Context window	1.1M tokens	200k tokens
Knowledge cutoff	—	30 Jun 2024
List price in / out per 1M	$1 / $5	$2 / $8
Blended price per 1M (3:1)	$2.00	$3.50
Cheapest host	OpenAI · $0.5 / $2.5	OpenAI · $2 / $8
Hosts on OpenRouter	2	1
Last tested	27 Oct 2026	27 Oct 2026

Compare any two models →

GPT-6.1 Terra vs o3: frequently asked questions

Is GPT-6.1 Terra better than o3?: On accuracy they are statistically tied: GPT-6.1 Terra scored 73.8% and o3 72.5% on the same 80 questions from open datasets. Similar accuracy; GPT-6.1 Terra costs less per question.
Which is cheaper, GPT-6.1 Terra or o3?: GPT-6.1 Terra is cheaper: $0.0013 per question as billed, against $0.0088. List prices: GPT-6.1 Terra $1 in / $5 out, o3 $2 in / $8 out per million tokens.
Which is faster, GPT-6.1 Terra or o3?: o3 is faster at 163 output tokens per second, against 122. Time to first token: 2.4 s for GPT-6.1 Terra, 1.2 s for o3.
Which has the larger context window, GPT-6.1 Terra or o3?: GPT-6.1 Terra, with 1.1M tokens against 200k.