Terminus-2 – gpt-oss-120b (low) vs. Codex – gpt-oss-20b (high): geospatial agent comparison

Comparison between Terminus-2 – gpt-oss-120b (low) and Codex – gpt-oss-20b (high) on the Geospatial Agent Index, each benchmark, cost, time and token use, from the same tasks, agent and limits. Methodology.

Side by side

Terminus-2 – gpt-oss-120b (low) vs. Codex – gpt-oss-20b (high)
Metric	Terminus-2 – gpt-oss-120b (low)	Codex – gpt-oss-20b (high)
Geospatial Agent Index	28*	4* (partial: attempt 1 on 173 of 565 tasks)
Earth-Bench V2 score	24	0
GeoBenchX score	32	8
GS-QA2 score	27	No data
GeoAgentBench score (guided GIS workflow; outside the index)	60	No data
GeoAnalystBench score (guided GIS workflow; outside the index)	47	No data
Raster and remote sensing score	22	0
Vector and overlay score	31	25
Networks and routing score	No data	No data
Climate and time series score	26	0
Spatial statistics and interpolation score	7	0
Mapping and cartography score	20	4
Recognising infeasible requests score	47	12
Cost per task	$0.0048	$0.140
Time per task	0.7 min	8.0 min
Tokens per attempt	12k	683k
Turns per attempt	2.9	29.5
Attempts decided	565	170
Input price per 1M tokens	$0.35	$0.20
Output price per 1M tokens	$0.75	$0.30
Context window	128,000	128,000
Image input	No	No
Developer	OpenAI	OpenAI

Charts

Partial coverage. Codex – gpt-oss-20b (high): 32 of 147 Earth-Bench V2 tasks; 141 of 173 GeoBenchX tasks; GS-QA2 incomplete. 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

Planned attempts still to come

Data table: Geospatial Agent Index

Geospatial Agent Index
Model	Creator	Geospatial Agent Index	Range while attempts are pending	Benchmarks covered	Coverage (attempts)
Terminus-2 – gpt-oss-120b (low)	OpenAI	28*	No pending judgements; coverage incomplete; 65 results awaiting review	3 of 3	565 of 859 planned attempts

Cost per task

Average cost per task (USD) · Lower is better

Planned attempts still to come

How to read this chart

Not shown: partial coverage. Codex – gpt-oss-20b (high).

Data table: Cost per task

Cost per task
Model	Creator	Cost per task	Coverage (attempts)
Terminus-2 – gpt-oss-120b (low)	OpenAI	$0.0048	565 of 859 planned attempts

Output tokens per task

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

Planned attempts still to come

How to read this chart

Not shown: partial coverage. Codex – gpt-oss-20b (high).

Data table: Output tokens per task

Output tokens per task
Model	Creator	Output tokens per task	Coverage (attempts)
Terminus-2 – gpt-oss-120b (low)	OpenAI	2k	565 of 859 planned attempts

Frequently asked questions

Which scores higher on the Geospatial Agent Index, Terminus-2 – gpt-oss-120b (low) or Codex – gpt-oss-20b (high)?

Not comparable yet: Codex – gpt-oss-20b (high) has partial coverage (32 of 147 Earth-Bench V2 tasks; 141 of 173 GeoBenchX tasks; GS-QA2 incomplete), so it is not ranked. Terminus-2 – gpt-oss-120b (low): 565 of 859 planned attempts. Codex – gpt-oss-20b (high): 170 of 614 planned attempts. Coverage is partial; scores can change as more attempts are decided.

Which is cheaper per task, Terminus-2 – gpt-oss-120b (low) or Codex – gpt-oss-20b (high)?

Terminus-2 – gpt-oss-120b (low), at $0.0048 against $0.140 for Codex – gpt-oss-20b (high).

Which writes fewer output tokens per task, Terminus-2 – gpt-oss-120b (low) or Codex – gpt-oss-20b (high)?

Terminus-2 – gpt-oss-120b (low), at 2k against 29k for Codex – gpt-oss-20b (high).

Which has the larger context window, Terminus-2 – gpt-oss-120b (low) or Codex – gpt-oss-20b (high)?

They are level, at 128,000 tokens.

More: Terminus-2 – gpt-oss-120b (low) · Codex – gpt-oss-20b (high) · all comparisons