GPT-6 Astra vs Grok 4.5
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 | Grok 4.5 | Advantage |
|---|---|---|---|
| Capability | 57% | 60% | +3% (Grok 4.5 leads) |
| Median task time | 1m 56s | 3m 9s | 1m 13s faster (GPT-6 Astra leads) |
| Approx. task cost | $0.046 / task | $0.032 / task | $0.014 / task lower (Grok 4.5 leads) |
GPT-6 Astra: 3.0% of ChatGPT Pro $100 (3.0% / 1w) per run. Grok 4.5: 6.9% of SuperGrok (6.9% / 1w) per run. Each figure is a share of that agent's own plan, so there is no delta to draw.
Only GPT-6 Astra has run this suite, so there is no head-to-head yet.
| Dimension | GPT-6 Astra | Grok 4.5 | Advantage |
|---|---|---|---|
| Capability | 61% | 59% | +3% (GPT-6 Astra leads) |
| Median task time | 2m 54s | 3m 40s | 46s faster (GPT-6 Astra leads) |
| Approx. task cost | $0.046 / task | $0.031 / task | $0.015 / task lower (Grok 4.5 leads) |
GPT-6 Astra: 0.2% of ChatGPT Pro $100 (0.2% / 1w) per good solve. Grok 4.5: 0.4% of SuperGrok (0.4% / 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-6 Astra or Grok 4.5?
Grok 4.5 clears higher: tier 4 of 5 versus tier 2 for GPT-6 Astra on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-09-05.
How much do GPT-6 Astra and Grok 4.5 cost?
GPT-6 Astra runs on ChatGPT Pro $100 at $100/month (public price as of 2026-09-05). Grok 4.5 runs on SuperGrok at $30/month (public price as of 2026-07-20).