Codex – GPT-6 Luna (medium) vs. Codex – GPT-5.6 Terra (high): geospatial agent comparison

Comparison between Codex – GPT-6 Luna (medium) and Codex – GPT-5.6 Terra (high) on the Geospatial Agent Index, each benchmark, cost, time and token use, from the same tasks, agent and limits. Methodology.

Side by side

Codex – GPT-6 Luna (medium) vs. Codex – GPT-5.6 Terra (high)
Metric	Codex – GPT-6 Luna (medium)	Codex – GPT-5.6 Terra (high)
Geospatial Agent Index	57* (partial: attempt 1 on 460 of 488 tasks)	69*
Earth-Bench V2 score	50	62
GeoBenchX score	56	67
GS-QA2 score	65	80
GeoAgentBench score (guided GIS workflow; outside the index)	94	96
GeoAnalystBench score (guided GIS workflow; outside the index)	89	95
Raster and remote sensing score	63	76
Vector and overlay score	65	77
Climate and time series score	47	61
Spatial statistics and interpolation score	22	50
Mapping and cartography score	76	74
Recognising infeasible requests score	38	60
Cost per task	$0.0026	$0.10
Time per task	1.3 min	2.5 min
Tokens per attempt	86k	162k
Turns per attempt	6.4	9.6
Attempts decided	460	487
Input price per 1M tokens	$0.10	$2.00
Output price per 1M tokens	$0.50	$12.00
Context window	No data	No data
Image input	No data	No data
Developer	OpenAI	OpenAI

Charts

Partial coverage. Codex – GPT-6 Luna (medium): 122 of 150 GeoBenchX tasks; Codex – GPT-5.6 Terra (high): 149 of 150 GeoBenchX tasks. Grey placeholders identify these entries in the index, cost and output token charts; their height does not represent a value. Comparable bars appear when first-attempt coverage is complete. Their available results remain in the side-by-side table.

Geospatial Agent Index

Equal-weight average of the evaluation scores, 0 to 100 · Higher is better

Data table: Geospatial Agent Index

Geospatial Agent Index
Model	Creator	Geospatial Agent Index	Range while attempts are pending	Benchmarks covered	Coverage (attempts)

Cost per task

Average cost per task (USD) · Lower is better

How to read this chart

Not shown: partial coverage. 2 entries without a first attempt on every index task. What is still running is on the models page.

Data table: Cost per task

Cost per task
Model	Creator	Cost per task	Coverage (attempts)

Output tokens per task

Average output tokens per attempt, reasoning included · Lower is better

How to read this chart

Not shown: partial coverage. 2 entries without a first attempt on every index task. What is still running is on the models page.

Data table: Output tokens per task

Output tokens per task
Model	Creator	Output tokens per task	Coverage (attempts)

Frequently asked questions

Which scores higher on the Geospatial Agent Index, Codex – GPT-6 Luna (medium) or Codex – GPT-5.6 Terra (high)?

Not comparable yet: Codex – GPT-6 Luna (medium) has partial coverage (122 of 150 GeoBenchX tasks) and Codex – GPT-5.6 Terra (high) has partial coverage (149 of 150 GeoBenchX tasks), so it is not ranked. Codex – GPT-6 Luna (medium): 460 of 722 scheduled attempts. Codex – GPT-5.6 Terra (high): 487 of 722 scheduled attempts. Coverage is partial; scores can change as more attempts are decided.

Which is cheaper per task, Codex – GPT-6 Luna (medium) or Codex – GPT-5.6 Terra (high)?

Codex – GPT-6 Luna (medium), at $0.0026 against $0.10 for Codex – GPT-5.6 Terra (high).

Which writes fewer output tokens per task, Codex – GPT-6 Luna (medium) or Codex – GPT-5.6 Terra (high)?

Codex – GPT-6 Luna (medium), at 1k against 3k for Codex – GPT-5.6 Terra (high).

Which has the larger context window, Codex – GPT-6 Luna (medium) or Codex – GPT-5.6 Terra (high)?

Not known yet: Codex – GPT-6 Luna (medium) has no context window data and Codex – GPT-5.6 Terra (high) has no context window data.

More: Codex – GPT-6 Luna (medium) · Codex – GPT-5.6 Terra (high) · all comparisons