gpt-5.6-terra vs composer-2.5
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 | composer-2.5 | Advantage |
|---|---|---|---|
| Capability | 53% | 57% | +3% (composer-2.5 leads) |
| Median task time | 1m 49s | 1m 30s | 19s faster (composer-2.5 leads) |
| Approx. task cost | $0.007 / task | $0.023 / task | $0.016 / task lower (gpt-5.6-terra leads) |
gpt-5.6-terra: 2.4% of ChatGPT Plus (2.4% / 1w) per run. composer-2.5: 1.8% of Cursor Pro (1.8% / 1m) 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 | composer-2.5 | Advantage |
|---|---|---|---|
| Capability | 62% | 51% | +11% (gpt-5.6-terra leads) |
| Median task time | 2m 15s | 4m 30s | 2m 15s faster (gpt-5.6-terra leads) |
| Approx. task cost | $0.005 / task | $0.029 / task | $0.024 / task lower (gpt-5.6-terra leads) |
gpt-5.6-terra: 0.4% of ChatGPT Plus (0.4% / 1w) per run. composer-2.5: 0.6% of Cursor Pro (0.6% / 1m) 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 | composer-2.5 | Advantage |
|---|---|---|---|
| Capability | 38% | 37% | +1% (gpt-5.6-terra leads) |
| Median task time | 2m 52s | 1m 51s | 1m 1s faster (composer-2.5 leads) |
| Approx. task cost | $0.008 / task | $0.024 / task | $0.017 / task lower (gpt-5.6-terra leads) |
gpt-5.6-terra: 0.2% of ChatGPT Plus (0.2% / 1w) per good solve. composer-2.5: 0.1% of Cursor Pro (0.1% / 1m) 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 composer-2.5?
gpt-5.6-terra clears higher: tier 3 of 5 versus tier 2 for composer-2.5 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 composer-2.5 cost?
gpt-5.6-terra runs on ChatGPT Plus at $20/month (public price as of 2026-07-20). composer-2.5 runs on Cursor Pro at $20/month (public price as of 2026-07-20).