Claude Code – Claude Opus 4.8 (high) vs. Codex – GPT-5.6 Luna (medium): geospatial agent comparison
Comparison between Claude Code – Claude Opus 4.8 (high) and Codex – GPT-5.6 Luna (medium) on the Geospatial Agent Index, each benchmark, cost, time and token use, from the same tasks, agent and limits. Methodology.
Side by side
| Metric | Claude Code – Claude Opus 4.8 (high) | Codex – GPT-5.6 Luna (medium) |
|---|---|---|
| Geospatial Agent Index | 76* | 66* (partial: attempt 1 on 339 of 488 tasks) |
| Earth-Bench V2 score | 71 | 60 |
| GeoBenchX score | 73 | 58 |
| GS-QA2 score | 84 | 79 |
| GeoAgentBench score (guided GIS workflow; outside the index) | 96 | 98 |
| GeoAnalystBench score (guided GIS workflow; outside the index) | 100 | 100 |
| Raster and remote sensing score | 82 | 78 |
| Vector and overlay score | 80 | 76 |
| Climate and time series score | 73 | 58 |
| Spatial statistics and interpolation score | 38 | 0 |
| Mapping and cartography score | 82 | 83 |
| Recognising infeasible requests score | 72 | 41 |
| Cost per task | $0.26 | $0.0084 |
| Time per task | 1.1 min | 2.1 min |
| Tokens per attempt | 128k | 125k |
| Turns per attempt | 6.0 | 8.9 |
| Attempts decided | 488 | 339 |
| Input price per 1M tokens | $5.00 | $0.20 |
| Output price per 1M tokens | $25.00 | $1.20 |
| Context window | No data | No data |
| Image input | No data | No data |
| Developer | Anthropic | OpenAI |
Charts
Partial coverage. Codex – GPT-5.6 Luna (medium): 107 of 117 Earth-Bench V2 tasks; 43 of 150 GeoBenchX tasks; 189 of 221 GS-QA2 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
First eight selected entries in metric order. Full results in table view.
Data table: Geospatial Agent Index
| Model | Creator | Geospatial Agent Index | Range while attempts are pending | Benchmarks covered | Coverage (attempts) |
|---|---|---|---|---|---|
| Claude Code – Claude Opus 4.8 (high) | Anthropic | 76* | No pending judgements; coverage incomplete; 187 results awaiting review | 3 of 3 | 488 of 722 scheduled attempts |
Cost per task
Average cost per task (USD) · Lower is better
First eight selected entries in metric order. Full results in table view.
How to read this chart
Not shown: partial coverage. 1 entries without a first attempt on every index task. What is still running is on the models page.
Data table: Cost per task
| Model | Creator | Cost per task | Coverage (attempts) |
|---|---|---|---|
| Claude Code – Claude Opus 4.8 (high) | Anthropic | $0.26 | 488 of 722 scheduled attempts |
Output tokens per task
Average output tokens per attempt, reasoning included · Lower is better
First eight selected entries in metric order. Full results in table view.
How to read this chart
Not shown: partial coverage. 1 entries without a first attempt on every index task. What is still running is on the models page.
Data table: Output tokens per task
| Model | Creator | Output tokens per task | Coverage (attempts) |
|---|---|---|---|
| Claude Code – Claude Opus 4.8 (high) | Anthropic | 4k | 488 of 722 scheduled attempts |
Frequently asked questions
Which scores higher on the Geospatial Agent Index, Claude Code – Claude Opus 4.8 (high) or Codex – GPT-5.6 Luna (medium)?
Which is cheaper per task, Claude Code – Claude Opus 4.8 (high) or Codex – GPT-5.6 Luna (medium)?
Which writes fewer output tokens per task, Claude Code – Claude Opus 4.8 (high) or Codex – GPT-5.6 Luna (medium)?
Which has the larger context window, Claude Code – Claude Opus 4.8 (high) or Codex – GPT-5.6 Luna (medium)?
More: Claude Code – Claude Opus 4.8 (high) · Codex – GPT-5.6 Luna (medium) · all comparisons