gpt-5.6-terra 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-terra | grok-4.6 | Advantage |
|---|---|---|---|
| Capability | 53% | 60% | +7% (grok-4.6 leads) |
| Median task time | 1m 49s | 6m 19s | 4m 30s faster (gpt-5.6-terra leads) |
| Approx. task cost | $0.007 / task | $0.013 / task | $0.005 / task lower (gpt-5.6-terra leads) |
gpt-5.6-terra: 2.4% of ChatGPT Plus (2.4% / 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-terra | grok-4.6 | Advantage |
|---|---|---|---|
| Capability | 62% | 60% | +2% (gpt-5.6-terra leads) |
| Median task time | 2m 15s | 32m 10s | 29m 55s faster (gpt-5.6-terra leads) |
| Approx. task cost | $0.005 / task | $0.093 / task | $0.089 / task lower (gpt-5.6-terra leads) |
gpt-5.6-terra: 0.4% of ChatGPT Plus (0.4% / 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-terra | grok-4.6 | Advantage |
|---|---|---|---|
| Capability | 38% | 46% | +8% (grok-4.6 leads) |
| Median task time | 2m 52s | 8m 23s | 5m 30s faster (gpt-5.6-terra leads) |
| Approx. task cost | $0.008 / task | $0.012 / task | $0.004 / task lower (gpt-5.6-terra leads) |
gpt-5.6-terra: 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-terra or grok-4.6?
grok-4.6 clears higher: tier 4 of 5 versus tier 3 for gpt-5.6-terra on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-08-17.
How much do gpt-5.6-terra and grok-4.6 cost?
gpt-5.6-terra 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).