GPT-6 Astra vs Grok 4.6
Grok 4.6 was superseded by Grok 4.7. The grades below are the last ones measured, so read them as history rather than as this week's board. See the current roster.
GPT-6 Astra leads overall, C to C-. GPT-6 Astra is about 3.0x cheaper per task. By suite, real-world issues is even at D and GPT-6 Astra takes spec planning (C+ to C). The data gives no reason to pick Grok 4.6 over GPT-6 Astra this week.Measured
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.
Verdict: Grok 4.6 vs GPT-6 Astra
GPT-6 Astra leads overall, C to C-. By suite: real-world issues is even at D (43% vs 47% capability); GPT-6 Astra takes spec planning, C+ to C (74% vs 66% capability); GPT-6 Astra takes vibe coding, C+ to C- (74% vs 61% capability). GPT-6 Astra used 22% of ChatGPT Plus's weekly limit per pass, $0.053 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~4.4% of ChatGPT Pro 5x's weekly limit (est, about $0.053 per task). Grok 4.6 used 13% of SuperGrok Plus's weekly limit per pass, $0.157 per task at the listed price. Per task, GPT-6 Astra is about 3.0x cheaper ($0.053 vs $0.157). GPT-6 Astra is faster on real-world issues: a median task takes 2m 13s against 7m 10s. Both finished every task on it. The data gives no reason to pick Grok 4.6 over GPT-6 Astra this week.
Changed since W38: GPT-6 Astra has one graded week under this version (W40); Grok 4.6: real-world issues C- to D, real-world issues usage 4% to 3% of the weekly limit, vibe coding C+ to C-.
| Dimension | GPT-6 Astra | Grok 4.6 | Advantage |
|---|---|---|---|
| Capability | 43% | 47% | +3% (Grok 4.6 leads) |
| Median task time | 2m 13s | 7m 10s | 4m 57s faster (GPT-6 Astra leads) |
| Approx. task cost | $0.052 / task | $0.046 / task | $0.006 / task lower (Grok 4.6 leads) |
GPT-6 Astra: 17.0% of ChatGPT Plus (112.0% / 5h, 17.0% / 1w) per run. Its weekly limit holds about 6 of the week's 33.6 5h windows. Grok 4.6: 3.0% of SuperGrok Plus (3.0% / 1w) per run. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | GPT-6 Astra | Grok 4.6 | Advantage |
|---|---|---|---|
| Capability | 74% | 66% | +9% (GPT-6 Astra leads) |
| Median task time | 3m 5s | 45m 26s | 42m 20s faster (GPT-6 Astra leads) |
| Approx. task cost | $0.057 / task | $0.575 / task | $0.517 / task lower (GPT-6 Astra leads) |
GPT-6 Astra: 5.0% of ChatGPT Plus (27.0% / 5h, 5.0% / 1w) per run. Its weekly limit holds about 6 of the week's 33.6 5h windows. Grok 4.6: 10.0% of SuperGrok Plus (10.0% / 1w) per run. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | GPT-6 Astra | Grok 4.6 | Advantage |
|---|---|---|---|
| Capability | 74% | 61% | +13% (GPT-6 Astra leads) |
| Median task time | 2m 40s | 11m 14s | 8m 34s faster (GPT-6 Astra leads) |
| Approx. task cost | $0.046 / task | <$0.230 / task | $0.184 / task lower (GPT-6 Astra leads) |
GPT-6 Astra: 1.0% of ChatGPT Plus (7.2% / 5h, 1.0% / 1w) per good solve. Its weekly limit holds about 6 of the week's 33.6 5h windows. Grok 4.6: under 1% of SuperGrok Plus 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 4.6?
Grok 4.6 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 2026-09-28.
Which is cheaper per task, GPT-6 Astra or Grok 4.6?
GPT-6 Astra used 22% of ChatGPT Plus's weekly limit per pass, $0.053 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~4.4% of ChatGPT Pro 5x's weekly limit (est, about $0.053 per task). Grok 4.6 used 13% of SuperGrok Plus's weekly limit per pass, $0.157 per task at the listed price. Per task, GPT-6 Astra is about 3.0x cheaper ($0.053 vs $0.157).
What do GPT-6 Astra and Grok 4.6 cost a month?
GPT-6 Astra runs on ChatGPT Plus at $20/month (public price as of 2026-07-20). Grok 4.6 runs on SuperGrok Plus at $100/month (public price as of 2026-09-14).