gpt-5.6-luna vs grok-4.6
Each agent graded on the same private suites, running headless through its own tools. Advantages are oriented so a win is a win, whichever way the metric runs.
| Dimension | gpt-5.6-luna | grok-4.6 | Advantage |
|---|---|---|---|
| Capability | 53% | 60% | +7% (grok-4.6 leads) |
| Median task time | 1m 59s | 6m 19s | 4m 20s faster (gpt-5.6-luna leads) |
| Approx. task cost | $0.009 / task | $0.013 / task | $0.004 / task lower (gpt-5.6-luna leads) |
gpt-5.6-luna: 2.9% of ChatGPT Plus (2.9% / 1w) per run. grok-4.6: 2.8% of SuperGrok (2.8% / 1w) per run. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | gpt-5.6-luna | grok-4.6 | Advantage |
|---|---|---|---|
| Capability | 58% | 60% | +2% (grok-4.6 leads) |
| Median task time | 2m 11s | 32m 10s | 29m 59s faster (gpt-5.6-luna leads) |
| Approx. task cost | $0.004 / task | $0.093 / task | $0.089 / task lower (gpt-5.6-luna leads) |
gpt-5.6-luna: 0.3% of ChatGPT Plus (0.3% / 1w) per run. grok-4.6: 5.4% of SuperGrok (5.4% / 1w) per run. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | gpt-5.6-luna | grok-4.6 | Advantage |
|---|---|---|---|
| Capability | 28% | 46% | +18% (grok-4.6 leads) |
| Median task time | 2m 44s | 8m 23s | 5m 39s faster (gpt-5.6-luna leads) |
| Approx. task cost | $0.008 / task | $0.012 / task | $0.004 / task lower (gpt-5.6-luna leads) |
gpt-5.6-luna: 0.2% of ChatGPT Plus (0.2% / 1w) per good solve. grok-4.6: 0.2% of SuperGrok (0.2% / 1w) per good solve. Each figure is a share of that agent's own plan, so there is no delta to draw.
Grades and deltas are comparable only within a suite version. See methodology.
Frequently asked questions
Which is better for coding, gpt-5.6-luna or grok-4.6?
grok-4.6 clears higher: tier 4 of 5 versus tier 3 for gpt-5.6-luna on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-08-17.
How much do gpt-5.6-luna and grok-4.6 cost?
gpt-5.6-luna runs on ChatGPT Plus at $20/month (public price as of 2026-07-20). grok-4.6 runs on SuperGrok at $30/month (public price as of 2026-07-20).