GPT-6.1 Terra vs Claude Opus 5.5: 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 Claude Opus 5.5 releases: 6 and 5 models respectively, each with different intelligence, performance, and pricing characteristics. Below is a comparison of the key metrics across all 11 models.

For intelligence, Claude Opus 5.5 scores highest: Claude Opus 5.5 (Max, Default Fallback) at 58, against GPT-6.1 Terra (Max) at 48 for GPT-6.1 Terra.
For cost per task, GPT-6.1 Terra is cheapest: GPT-6.1 Terra (Low) at $0.05, against Claude Opus 5.5 (Low, Default Fallback) at $0.55 for Claude Opus 5.5.

Model Playground

Releases compared


	Claude Opus 5.5 (max with fallback)	Claude Opus 5.5 (xhigh with fallback)	Claude Opus 5.5 (high with fallback)	Claude Opus 5.5 (medium with fallback)	GPT-6.1 Terra (max)	GPT-6.1 Terra (xhigh)	GPT-6.1 Terra (high)	Claude Opus 5.5 (low with fallback)	GPT-6.1 Terra (medium)	GPT-6.1 Terra (low)	GPT-6.1 Terra (non-reasoning)
Intelligence Index	58	56	54	51	48	45	44	42	41	36	33
Finance & Accounting	61	58	56	54	47	46	44	46	43	38	36
Strategy & Ops	64	62	59	57	50	48	47	48	45	42	42
Legal	63	61	59	57	49	48	47	52	46	42	35
Healthcare & Medical	55	53	49	49	--	--	--	43	--	--	--
Engineering	60	59	56	54	49	46	45	45	42	35	32
Economics	66	63	61	60	54	52	51	53	49	44	38
AA-Briefcase v1.1	1801	1761	1683	1622	1402	1329	1264	1276	1192	1030	1229
GDPval-AA v2.1	1866	1829	1704	1585	1468	1403	1342	1234	1316	1199	1282
AutomationBench-AA	69.5%	65.0%	63.2%	61.2%	60.2%	59.9%	58.5%	52.9%	57.8%	56.2%	51.0%
Terminal-Bench 4.0	59.6%	59.6%	56.6%	52.5%	55.6%	46.5%	41.9%	31.3%	32.3%	15.2%	26.8%
SciCode	66.9%	65.0%	60.4%	59.3%	55.1%	53.4%	51.6%	58.6%	51.6%	52.4%	47.8%
Humanity's Last Exam	61.4%	57.5%	55.6%	54.7%	46.2%	43.7%	43.3%	48.3%	40.2%	35.8%	21.1%
GDP.pdf	26.2%	26.6%	28.8%	25.6%	28.6%	26.6%	28.0%	25.6%	28.4%	25.6%	23.2%
CritPt	31.7%	31.7%	30.9%	27.7%	28.0%	26.6%	25.7%	17.7%	21.4%	15.1%	4.9%
AA-Omniscience	46	43	41	40	30	29	28	39	27	24	4
AA-LCR v1.1	84.7%	84.7%	82.7%	84.3%	82.7%	81.7%	82.3%	80.7%	80.7%	81.0%	67.7%

Cost per TaskUSD	$5.98	$3.46	$1.82	$1.34	$0.40	$0.19	$0.13	$0.55	$0.10	$0.05	$0.11
Input PriceUSD/1M Tokens	$4.00	$4.00	$4.00	$4.00	$1.00	$1.00	$1.00	$4.00	$1.00	$1.00	$1.00
Output PriceUSD/1M Tokens	$20.00	$20.00	$20.00	$20.00	$5.00	$5.00	$5.00	$20.00	$5.00	$5.00	$5.00
Cache Hit PriceUSD/1M Tokens	$0.20	$0.20	$0.20	$0.20	$0.05	$0.05	$0.05	$0.20	$0.05	$0.05	$0.05
Cache Write PriceUSD/1M Tokens	$5.00	$5.00	$5.00	$5.00	$1.25	$1.25	$1.25	$5.00	$1.25	$1.25	$1.25

Output SpeedTokens/s	98	82	80	83	--	--	--	82	--	--	--
Time to First Tokens	706.02	121.67	33.85	19.26	--	--	--	10.85	--	--	--
Time to First Answer Tokens	706.02	121.67	33.85	19.26	--	--	--	10.85	--	--	--
End-to-End Response Times	711.11	127.77	40.07	25.28	--	--	--	16.97	--	--	--
Time per Tasks	774.67	494.28	278.52	195.44	--	--	--	79.66	--	--	--

Context Window	1M	1M	1M	1M	1M	1M	1M	1M	1M	1M	1M
Creator	Anthropic	Anthropic	Anthropic	Anthropic	OpenAI	OpenAI	OpenAI	Anthropic	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 Task

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

Most attractive quadrant

GPT-6.1 Terra

Claude Opus 5.5

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

Benchmarks

AA-PersonalityBenchNew

Personality Indexes

Each axis is one of 8 personality indexes: the mean of its traits’ Elo z-scores, percentile ranked from 1 to 100 across all models evaluated in the benchmark

GPT-6.1 Terra vs Claude Opus 5.5: Release Comparison

Intelligence

Speed

Cost per Task

Intelligence

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

Speed & Latency

Output Speed

Output Speed

Model Performance Representation

Capability Scores

Capability Indexes

Benchmarks

AA-PersonalityBenchNew

Personality Indexes