gpt-5.6-luna vs gpt-5.6-sol
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 | gpt-5.6-sol | Advantage |
|---|---|---|---|
| Capability | 53% | 60% | +7% (gpt-5.6-sol leads) |
| Median task time | 1m 59s | 2m 28s | 30s faster (gpt-5.6-luna leads) |
| Approx. task cost | $0.009 / task | $0.011 / task | $0.002 / task lower (gpt-5.6-luna leads) |
gpt-5.6-luna: 2.9% of ChatGPT Plus (2.9% / 1w) per run. gpt-5.6-sol: 3.5% of ChatGPT Plus (3.5% / 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 | gpt-5.6-sol | Advantage |
|---|---|---|---|
| Capability | 58% | 67% | +9% (gpt-5.6-sol leads) |
| Median task time | 2m 11s | 4m 11s | 2m 0s faster (gpt-5.6-luna leads) |
| Approx. task cost | $0.004 / task | $0.010 / task | $0.006 / task lower (gpt-5.6-luna leads) |
gpt-5.6-luna: 0.3% of ChatGPT Plus (0.3% / 1w) per run. gpt-5.6-sol: 0.9% of ChatGPT Plus (0.9% / 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 | gpt-5.6-sol | Advantage |
|---|---|---|---|
| Capability | 28% | 56% | +28% (gpt-5.6-sol leads) |
| Median task time | 2m 44s | 3m 43s | 1m 0s faster (gpt-5.6-luna leads) |
| Approx. task cost | $0.008 / task | $0.011 / 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. gpt-5.6-sol: 0.2% of ChatGPT Plus (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 gpt-5.6-sol?
gpt-5.6-sol 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 gpt-5.6-sol cost?
gpt-5.6-luna runs on ChatGPT Plus at $20/month (public price as of 2026-07-20). gpt-5.6-sol runs on ChatGPT Plus at $20/month (public price as of 2026-07-20).