GPT-6 Astra vs GPT-5.6 Terra: Release Comparison

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

Comparison of the GPT-6 Astra and GPT-5.6 Terra releases: 5 and 6 models respectively, each with different intelligence, performance, and pricing characteristics. Below is a comparison of the key metrics across all 11 models.

For intelligence, GPT-6 Astra scores highest: GPT-6 Astra (Max) at 53, against GPT-5.6 Terra (Max) at 42 for GPT-5.6 Terra.
For output speed, GPT-5.6 Terra is fastest: GPT-5.6 Terra (Max) at 112 t/s, against GPT-6 Astra (Max) at 54 t/s for GPT-6 Astra.
For cost per task, GPT-5.6 Terra is cheapest: GPT-5.6 Terra (Non-reasoning) at $0.14, against GPT-6 Astra (Low) at $0.82 for GPT-6 Astra.

Model Playground

Releases compared


	GPT-6 Astra (max)	GPT-6 Astra (xhigh)	GPT-6 Astra (high)	GPT-6 Astra (medium)	GPT-6 Astra (low)	GPT-5.6 Terra (max)	GPT-5.6 Terra (xhigh)	GPT-5.6 Terra (high)	GPT-5.6 Terra (medium)	GPT-5.6 Terra (low)	GPT-5.6 Terra (non-reasoning)
Intelligence Index	53	52	51	50	46	42	38	34	30	27	21
Finance & Accounting	55	54	53	52	49	41	40	37	32	30	21
Strategy & Ops	57	57	55	54	50	47	44	40	34	31	23
Legal	59	58	58	57	53	41	40	37	34	31	22
Healthcare & Medical	52	--	--	--	--	40	38	34	31	27	--
Engineering	55	55	53	52	48	43	38	34	31	28	21
Economics	60	59	58	58	55	45	44	42	37	34	24
AA-Briefcase v1.1	1570	1546	1506	1461	1257	1334	1333	1202	1039	1014	947
GDPval-AA v2.1	1573	1554	1524	1485	1389	1451	1447	1376	1264	1108	1097
AutomationBench-AA	68.5%	67.2%	66.6%	64.6%	59.1%	59.6%	47.1%	42.0%	33.5%	29.1%	12.5%
Terminal-Bench 4.0	59.1%	59.6%	54.0%	49.5%	41.9%	35.4%	10.1%	1.5%	1.0%	1.5%	0.5%
SciCode	56.5%	55.7%	55.4%	54.2%	54.1%	55.0%	52.3%	52.4%	50.5%	49.9%	45.1%
Humanity's Last Exam	54.7%	54.6%	53.1%	52.7%	49.2%	42.9%	41.9%	38.5%	33.3%	29.2%	11.4%
GDP.pdf	31.0%	32.2%	31.0%	30.4%	30.4%	24.0%	24.6%	20.8%	17.0%	17.6%	11.2%
CritPt	31.7%	31.4%	28.9%	29.1%	26.3%	30.0%	27.1%	22.9%	17.4%	9.4%	2.0%
AA-Omniscience	43	43	44	42	41	0	−3	−3	−5	−7	−23
AA-LCR v1.1	80.7%	80.0%	80.0%	79.7%	80.0%	83.0%	79.0%	77.7%	74.0%	71.3%	58.7%

Cost per TaskUSD	$3.26	$2.31	$1.73	$1.54	$0.82	$1.40	$0.63	$0.34	$0.18	$0.14	$0.14
Input PriceUSD/1M Tokens	$10.00	$10.00	$10.00	$10.00	$10.00	$2.00	$2.00	$2.00	$2.00	$2.00	$2.00
Output PriceUSD/1M Tokens	$50.00	$50.00	$50.00	$50.00	$50.00	$12.00	$12.00	$12.00	$12.00	$12.00	$12.00
Cache Hit PriceUSD/1M Tokens	$1.00	$1.00	$1.00	$1.00	$1.00	$0.20	$0.20	$0.20	$0.20	$0.20	$0.20
Cache Write PriceUSD/1M Tokens	$12.50	$12.50	$12.50	$12.50	$12.50	$2.50	$2.50	$2.50	$2.50	$2.50	$2.50

Output SpeedTokens/s	54	46	49	50	47	112	104	98	100	98	96
Time to First Tokens	300.41	165.55	75.04	6.30	3.07	128.27	32.80	7.08	1.75	1.54	0.78
Time to First Answer Tokens	300.41	165.55	75.04	6.30	3.07	128.27	32.80	7.08	1.75	1.54	0.78
End-to-End Response Times	309.69	176.30	85.32	16.25	13.63	132.73	37.62	12.20	6.73	6.65	6.00
Time per Tasks	509.22	369.30	246.39	193.88	94.37	342.74	194.06	116.67	54.22	39.25	32.57

Context Window	1M	1M	1M	1M	1M	1M	1M	1M	1M	1M	1M
Creator	OpenAI	OpenAI	OpenAI	OpenAI	OpenAI	OpenAI	OpenAI	OpenAI	OpenAI	OpenAI	OpenAI
License	Proprietary	Proprietary	Proprietary	Proprietary	Proprietary	Proprietary	Proprietary	Proprietary	Proprietary	Proprietary	Proprietary
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 and image	Supports: text and image	Supports: text and image	Supports: text and image	Supports: text and image
Output Modality	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text	Supports: text
Providers

Intelligence

Artificial Analysis Intelligence Index · Higher is better

Speed

Output tokens per second · Higher is better

Cost per Task

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

Intelligence

Artificial Analysis Intelligence Index

Artificial Analysis Intelligence Index v4.3.2 incorporates 10 evaluations: AA-Briefcase v1.1, GDPval-AA v2.1, AutomationBench-AA, Terminal-Bench 4.0, SciCode, Humanity's Last Exam, GDP.pdf, CritPt, AA-Omniscience, AA-LCR v1.1

Artificial Analysis Intelligence Index v4.3.2 includes: AA-Briefcase v1.1, GDPval-AA v2.1, AutomationBench-AA, Terminal-Bench 4.0, SciCode, Humanity's Last Exam, GDP.pdf, CritPt, AA-Omniscience, AA-LCR v1.1. See Intelligence Index methodology for further details, including a breakdown of each evaluation and how we run them.

Intelligence Index vs. Cost per Intelligence Index Task

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

Most attractive quadrant

GPT-6 Astra

GPT-5.6 Terra

Pareto line

AA-Briefcase v1.1

GDPval-AA v2.1

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

Speed & Latency

Output Speed

Output tokens per second · Higher is better

Tokens per second received while the model is generating tokens (ie. after first chunk has been received from the API for models which support streaming).

Figures represent performance of the model's first-party API or the median across providers where a first-party API is not available.

Capability Scores

Capability Indexes

Measures the performance of models on specific capabilities and industries

Finance & Accounting Index

Incorporates 7 evaluations: AA-Omniscience, GDPval-AA v2.1, AA-Briefcase v1.1, Humanity's Last Exam, AutomationBench-AA, AA-LCR v1.1, GDP.pdf · Higher is better

Strategy & Ops Index

Incorporates 6 evaluations: GDPval-AA v2.1, AA-Briefcase v1.1, AA-Omniscience, AutomationBench-AA, AA-LCR v1.1, GDP.pdf · Higher is better

Legal Index

Incorporates 7 evaluations: AA-Omniscience, GDPval-AA v2.1, AA-Briefcase v1.1, Humanity's Last Exam, AA-LCR v1.1, GDP.pdf, AutomationBench-AA · Higher is better

Healthcare & Medical Index

Incorporates 6 evaluations: AA-Omniscience, GDPval-AA v2.1, AA-Briefcase v1.1, MLCR-AA, Humanity's Last Exam, AutomationBench-AA · Higher is better

Engineering Index

Incorporates 6 evaluations: AA-Omniscience, Humanity's Last Exam, CritPt, GDPval-AA v2.1, AA-Briefcase v1.1, Terminal-Bench 4.0 · Higher is better

Economics Index

Incorporates 5 evaluations: AA-Omniscience, Humanity's Last Exam, GDPval-AA v2.1, AA-Briefcase v1.1, AA-LCR v1.1 · Higher is better

GPT-6 Astra vs GPT-5.6 Terra: Release Comparison

Intelligence

Speed

Cost per Task

Intelligence

Artificial Analysis Intelligence Index

Artificial Analysis Intelligence Index

Intelligence Index vs. Cost per Intelligence Index Task

Cost per Intelligence Index Task

Artificial Analysis Intelligence Index

Cost

Cost per Intelligence Index Task

Cost per Intelligence Index Task

Speed & Latency

Output Speed

Output Speed

Model Performance Representation

Capability Scores

Capability Indexes