GPT-6.1 Terra vs K2-V2: Release Comparison

Name: Intelligence
Creator: Artificial Analysis
License: https://artificialanalysis.ai/docs/legal/Terms-of-Use.pdf

Comparison of the GPT-6.1 Terra and K2-V2 releases: 6 and 3 models respectively, each with different intelligence, performance, and pricing characteristics. Below is a comparison of the key metrics across all 9 models.

Model Playground

Releases compared


	GPT-6.1 Terra (max)	GPT-6.1 Terra (xhigh)	GPT-6.1 Terra (high)	GPT-6.1 Terra (medium)	GPT-6.1 Terra (non-reasoning)	GPT-6.1 Terra (low)	K2-V2 (high)	K2-V2 (medium)	K2-V2 (low)
Intelligence Index	51	45	42	38	31	29	--	--	--
Finance & Accounting	49	48	44	42	34	38	--	--	--
Strategy & Ops	50	49	47	45	40	42	--	--	--
Legal	46	44	42	40	28	37	--	--	--
Healthcare & Medical	45	--	--	--	--	--	--	--	--
Engineering	55	49	46	43	33	35	--	--	--
Economics	48	46	43	41	32	36	--	--	--
AA-Briefcase v1.1	1401	1334	1265	1191	1226	1032	--	--	--
AutomationBench-AA	60.2%	59.9%	58.5%	57.8%	51.0%	56.2%	--	--	--
Terminal-Bench 4.0	55.6%	46.5%	41.9%	32.3%	26.8%	15.2%	--	--	--
FrontierCode-AA 2.0	42.3%	36.9%	37.5%	34.5%	33.4%	24.5%	--	--	--
AA-Omniscience v1.1	30	29	28	27	−5	23	--	--	--
GDP.pdf	28.6%	26.6%	28.0%	28.4%	23.2%	25.6%	--	--	--
HLE-Diamond	47.3%	42.3%	35.4%	31.3%	14.5%	24.9%	--	--	--
CritPt v2 (Hard Subset)	68.0%	60.5%	61.5%	56.5%	33.5%	50.5%	--	--	--
Terminal-Bench-Science 0.1	57.6%	41.9%	33.3%	24.8%	24.3%	7.6%	--	--	--

Cost per TaskUSD	$0.96	$0.40	$0.26	$0.17	$0.23	$0.0713	--	--	--
Input PriceUSD/1M Tokens	$1.00	$1.00	$1.00	$1.00	$1.00	$1.00	--	--	--
Output PriceUSD/1M Tokens	$5.00	$5.00	$5.00	$5.00	$5.00	$5.00	--	--	--
Cache Hit PriceUSD/1M Tokens	$0.05	$0.05	$0.05	$0.05	$0.05	$0.05	--	--	--
Cache Write PriceUSD/1M Tokens	$1.25	$1.25	$1.25	$1.25	$1.25	$1.25	--	--	--

Time per TaskMinutes	14.5	6.7	4.4	2.9	2.5	1.2	--	--	--
Output Speedtok/s	69	66	64	62	64	61	--	--	--
Time to First Answer Tokens	186.94	37.46	13.58	5.36	2.28	2.86	--	--	--
Time to First Tokens	186.94	37.46	13.58	5.36	2.28	2.86	--	--	--
End-to-End TimeMean of Single-Request Workloads (s)	400.62	102.06	51.05	33.11	25.93	22.81	--	--	--

Context Window	1M	1M	1M	1M	1M	1M	512k	512k	512k
Creator	OpenAI	OpenAI	OpenAI	OpenAI	OpenAI	OpenAI	Institute of Foundation Models	Institute of Foundation Models	Institute of Foundation Models
License	Proprietary	Proprietary	Proprietary	Proprietary	Proprietary	Proprietary	Open	Open	Open
Input Modality	Supports: text and image	Supports: text and image	Supports: text and image	Supports: text and image	Supports: text and image	Supports: text and image	Supports: text	Supports: text	Supports: text
Output Modality	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text
Providers							--	--	--

Updated

Intelligence

Artificial Analysis Intelligence Index · Higher is better

Time per Task

Inference time (minutes) per Intelligence Index task · Lower is better

Cost per Task

Weighted average cost (USD) per Intelligence Index task · Lower is better

IntelligenceUpdated

Artificial Analysis Intelligence Index

Artificial Analysis Intelligence Index v5.0.1 incorporates 9 evaluations: AA-Briefcase v1.1, AutomationBench-AA, Terminal-Bench 4.0, FrontierCode-AA 2.0, AA-Omniscience v1.1, GDP.pdf, HLE-Diamond, CritPt v2 (Hard Subset), and Terminal-Bench-Science 0.1

Artificial Analysis Intelligence Index v5.0.1 includes: AA-Briefcase v1.1, AutomationBench-AA, Terminal-Bench 4.0, FrontierCode-AA 2.0, AA-Omniscience v1.1, GDP.pdf, HLE-Diamond, CritPt v2 (Hard Subset), Terminal-Bench-Science 0.1. See Intelligence Index methodology for further details, including a breakdown of each evaluation and how we run them.

Intelligence Index vs. Cost per Task

Artificial Analysis Intelligence Index · Weighted average cost (USD) per Artificial Analysis Intelligence Index task

Most attractive quadrant

GPT-6.1 Terra

Pareto line

AA-Briefcase v1.1

AutomationBench-AA

Cost per Task (USD, Log Scale)

Weighted average cost per Intelligence Index task. Each evaluation’s cost is calculated from input, cache hit, cache write, reasoning, and answer token prices, divided by task count, and weighted by its Intelligence Index weight.

Cost

Cost per Intelligence Index Task

Weighted average cost (USD) per Intelligence Index task · Segmented by token type · Lower is better

Performance

Time per Intelligence Index Task

Output tokens divided by end-to-end output speed (minutes per Intelligence Index task) · Speed at the model's own endpoint or the median across providers · Lower is better

The weighted average time (minutes) per Artificial Analysis Intelligence Index task: output tokens per task divided by output speed, weighted by each benchmark's weight in the Intelligence Index.

Speed and latency metrics average each endpoint's runs over the past 5 days, and the error rate pools them. We run the benchmark every 6 hours, and endpoints of deprecated models every 18 hours.

Capability Scores

Capability Indexes

Measures the performance of models on specific capabilities and industries

Finance & Accounting Index

Incorporates 5 evaluations: AA-Briefcase v1.1, AA-Omniscience v1.1, HLE-Diamond, AutomationBench-AA, GDP.pdf · Higher is better

Strategy & Ops Index

Incorporates 4 evaluations: AutomationBench-AA, AA-Briefcase v1.1, AA-Omniscience v1.1, GDP.pdf · Higher is better

Legal Index

Incorporates 5 evaluations: AA-Omniscience v1.1, AA-Briefcase v1.1, HLE-Diamond, GDP.pdf, AutomationBench-AA · Higher is better

Healthcare & Medical Index

Incorporates 5 evaluations: AA-Omniscience v1.1, AA-Briefcase v1.1, MLCR-AA, AutomationBench-AA, HLE-Diamond · Higher is better

Engineering Index

Incorporates 7 evaluations: AA-Omniscience v1.1, CritPt v2 (Hard Subset), Terminal-Bench-Science 0.1, HLE-Diamond, Terminal-Bench 4.0, FrontierCode-AA 2.0, AA-Briefcase v1.1 · Higher is better

Economics Index

Incorporates 4 evaluations: AA-Omniscience v1.1, AA-Briefcase v1.1, HLE-Diamond, GDP.pdf · Higher is better

GPT-6.1 Terra vs K2-V2: Release Comparison

Intelligence

Time per Task

Cost per Task

IntelligenceUpdated

Artificial Analysis Intelligence Index

Artificial Analysis Intelligence Index

Intelligence Index vs. Cost per Task

Cost per Intelligence Index Task

Artificial Analysis Intelligence Index

Cost

Cost per Intelligence Index Task

Cost per Intelligence Index Task

Performance

Time per Intelligence Index Task

Time per Intelligence Index Task

Time Period

Capability Scores

Capability Indexes