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% | 60% | +7% (composer-2.5 leads) |
| Median task time | 1m 57s | 3m 52s | 1m 55s faster (gpt-5.6-terra leads) |
| Approx. task cost | $0.006 / task | $0.025 / task | $0.018 / task lower (gpt-5.6-terra leads) |
gpt-5.6-terra: 2.1% of ChatGPT Plus (2.1% / 1w) per run. composer-2.5: 1.9% of Cursor Pro (1.9% / 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 | 52% | 52% | +1% (gpt-5.6-terra leads) |
| Median task time | 3m 12s | 4m 56s | 1m 44s faster (gpt-5.6-terra leads) |
| Approx. task cost | $0.008 / task | $0.025 / task | $0.018 / 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?
composer-2.5 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 2026-08-10.
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).