GPT-5.6 Luna vs GPT-5.6 Terra: Release Comparison

Comparison of the GPT-5.6 Luna and GPT-5.6 Terra releases: 6 and 6 models respectively, each with different intelligence, performance, and pricing characteristics. Below is a comparison of the key metrics across all 12 models.

  • For intelligence, GPT-5.6 Terra scores highest: GPT-5.6 Terra (max) at 42, against GPT-5.6 Luna (max) at 38 for GPT-5.6 Luna.
  • For output speed, GPT-5.6 Luna is fastest: GPT-5.6 Luna (Non-reasoning) at 118 t/s, against GPT-5.6 Terra (max) at 107 t/s for GPT-5.6 Terra.
  • For cost per task, GPT-5.6 Luna is cheapest: GPT-5.6 Luna (xhigh) at $0.09, against GPT-5.6 Terra (high) at $0.34 for GPT-5.6 Terra.

Releases compared

OpenAIGPT-5.6 LunaOpenAIGPT-5.6 Terra

Intelligence

Artificial Analysis Intelligence Index

Artificial Analysis Intelligence Index v4.3 incorporates 10 evaluations: AA-Briefcase, GDPval-AA v2, AutomationBench-AA, Terminal-Bench v4.0, SciCode, Humanity's Last Exam, GDP.pdf, CritPt, AA-Omniscience, AA-LCR v1.1
Estimate (independent evaluation forthcoming)

Artificial Analysis Intelligence Index v4.3 includes: AA-Briefcase, GDPval-AA v2, AutomationBench-AA, Terminal-Bench v4.0, 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-5.6 Luna
GPT-5.6 Terra
Pareto line

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.

Artificial Analysis Intelligence Index v4.3 includes: AA-Briefcase, GDPval-AA v2, AutomationBench-AA, Terminal-Bench v4.0, 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.

Cost

Cost per Intelligence Index Task

Weighted average cost (USD) per Artificial Analysis Intelligence Index task, segmented by token type. Lower is better

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.

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 (e.g. OpenAI for o1) or the median across providers where a first-party API is not available (e.g. Meta's Llama models).

Capability Scores

Capability Indices

Measures the performance of models on specific capabilities and industries
Finance & Accounting Index

Incorporates 5 evaluations: AA-Omniscience, GDPval-AA v2, Humanity's Last Exam, 𝜏³-Banking, AA-LCR v1.1 · Higher is better

Strategy & Ops Index

Incorporates 4 evaluations: AA-Omniscience, GDPval-AA v2, 𝜏³-Banking, AA-LCR v1.1 · Higher is better

Legal Index

Incorporates 5 evaluations: AA-Omniscience, GDPval-AA v2, AA-LCR v1.1, 𝜏³-Banking, Humanity's Last Exam · Higher is better

Healthcare & Medical Index

Incorporates 5 evaluations: AA-Omniscience, GDPval-AA v2, MLCR-AA, Humanity's Last Exam, 𝜏³-Banking · Higher is better

Engineering Index

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

Economics Index

Incorporates 4 evaluations: AA-Omniscience, Humanity's Last Exam, GDPval-AA v2, AA-LCR v1.1 · Higher is better

Further details

Weights
Provider Benchmarks
GPT-5.6 Terra (max)
OpenAI logoOpenAI
42
-
1M
$1.7
107
Not available
OpenAIAmazon Bedrock
View
GPT-5.6 Terra (xhigh)
OpenAI logoOpenAI
38
-
1M
$1.7
98
Not available
OpenAIMicrosoft Azure
View
GPT-5.6 Luna (max)
OpenAI logoOpenAI
38
-
1M
$0.2
113
Not available
OpenAIAmazon Bedrock
View
GPT-5.6 Luna (xhigh)
OpenAI logoOpenAI
35
-
1M
$0.2
107
Not available
OpenAIMicrosoft Azure
View
GPT-5.6 Terra (high)
OpenAI logoOpenAI
34
-
1M
$1.7
93
Not available
OpenAIMicrosoft Azure
View
GPT-5.6 Luna (high)
OpenAI logoOpenAI
33
-
1M
$0.2
113
Not available
OpenAIMicrosoft Azure
View
GPT-5.6 Terra (medium)
OpenAI logoOpenAI
33
-
1M
$1.7
91
Not available
OpenAI
View
GPT-5.6 Terra (low)
OpenAI logoOpenAI
28
-
1M
$1.7
92
Not available
OpenAI
View
GPT-5.6 Luna (medium)
OpenAI logoOpenAI
26
-
1M
$0.2
110
Not available
OpenAI
View
GPT-5.6 Terra (Non-reasoning)
OpenAI logoOpenAI
22
-
1M
$1.7
92
Not available
OpenAIAmazon Bedrock
View
GPT-5.6 Luna (low)
OpenAI logoOpenAI
22
-
1M
$0.2
116
Not available
OpenAI
View
GPT-5.6 Luna (Non-reasoning)
OpenAI logoOpenAI
17
-
1M
$0.2
118
Not available
OpenAIAmazon Bedrock
View