GPT-6 Astra 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-6 Astra | Composer 2.5 | Advantage |
|---|---|---|---|
| Capability | 57% | 57% | Even |
| Median task time | 1m 56s | 1m 49s | 8s faster (Composer 2.5 leads) |
| Approx. task cost | $0.046 / task | $0.024 / task | $0.022 / task lower (Composer 2.5 leads) |
GPT-6 Astra: 3.0% of ChatGPT Pro $100 (3.0% / 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-6 Astra | Composer 2.5 | Advantage |
|---|---|---|---|
| Capability | 74% | 49% | +25% (GPT-6 Astra leads) |
| Median task time | 4m 0s | 1m 49s | 2m 11s faster (Composer 2.5 leads) |
| Approx. task cost | $0.057 / task | $0.023 / task | $0.035 / task lower (Composer 2.5 leads) |
GPT-6 Astra: 1.0% of ChatGPT Pro $100 (1.0% / 1w) per run. Composer 2.5: 0.5% of Cursor Pro (0.5% / 1m) per run. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | GPT-6 Astra | Composer 2.5 | Advantage |
|---|---|---|---|
| Capability | 61% | 35% | +26% (GPT-6 Astra leads) |
| Median task time | 2m 54s | 2m 13s | 41s faster (Composer 2.5 leads) |
| Approx. task cost | $0.046 / task | $0.028 / task | $0.018 / task lower (Composer 2.5 leads) |
GPT-6 Astra: 0.2% of ChatGPT Pro $100 (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-6 Astra or Composer 2.5?
They are even on our ladder: both clear tier 2 of 5 at 57% capability on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-09-05.
How much do GPT-6 Astra and Composer 2.5 cost?
GPT-6 Astra runs on ChatGPT Pro $100 at $100/month (public price as of 2026-09-05). Composer 2.5 runs on Cursor Pro at $20/month (public price as of 2026-07-20).