GPT-6 Astra vs GPT-6 Sol
GPT-6 Sol was superseded by GPT-6.1 Sol. 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 Sol is about 3.1x cheaper per task. By suite, GPT-6 Sol takes real-world issues (C- to D) and GPT-6 Astra takes spec planning (C+ to C-). Take GPT-6 Sol anyway when you want the side that is cheaper per task, faster on real-world issues and ahead on real-world issues.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: GPT-6 Sol vs GPT-6 Astra
GPT-6 Astra leads overall, C to C-. By suite: GPT-6 Sol takes real-world issues, C- to D (55% vs 43% capability); GPT-6 Astra takes spec planning, C+ to C- (74% vs 60% 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). GPT-6 Sol used 7% of ChatGPT Plus's weekly limit per pass, $0.017 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~1.4% of ChatGPT Pro 5x's weekly limit (est, about $0.017 per task). Per task, GPT-6 Sol is about 3.1x cheaper ($0.017 vs $0.053). GPT-6 Sol is faster on real-world issues: a median task takes 1m 41s against 2m 13s. Both finished every task on it. Reasons to pick GPT-6 Sol anyway: it is cheaper per task ($0.017 vs $0.053), it is faster on real-world issues (1m 41s vs 2m 13s median) and it leads on real-world issues (C- to D).
Changed since W39: GPT-6 Astra has one graded week under this version (W40); GPT-6 Sol: real-world issues D- to C-, real-world issues usage 4% to 5% of the weekly limit, spec planning C to C-, spec planning usage 1% to 2% of the weekly limit, vibe coding D+ to C-.
| Dimension | GPT-6 Astra | GPT-6 Sol | Advantage |
|---|---|---|---|
| Capability | 43% | 55% | +12% (GPT-6 Sol leads) |
| Median task time | 2m 13s | 1m 41s | 32s faster (GPT-6 Sol leads) |
| Approx. task cost | $0.052 / task | $0.015 / task | $0.037 / task lower (GPT-6 Sol 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. GPT-6 Sol: 5.0% of ChatGPT Plus (35.0% / 5h, 5.0% / 1w) per run. Its weekly limit holds about 6 of the week's 33.6 5h windows. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | GPT-6 Astra | GPT-6 Sol | Advantage |
|---|---|---|---|
| Capability | 74% | 60% | +14% (GPT-6 Astra leads) |
| Median task time | 3m 5s | 2m 58s | 8s faster (GPT-6 Sol leads) |
| Approx. task cost | $0.057 / task | $0.023 / task | $0.034 / task lower (GPT-6 Sol 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. GPT-6 Sol: 2.0% of ChatGPT Plus (10.0% / 5h, 2.0% / 1w) per run. Its weekly limit holds about 6 of the week's 33.6 5h windows. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | GPT-6 Astra | GPT-6 Sol | Advantage |
|---|---|---|---|
| Capability | 74% | 61% | +13% (GPT-6 Astra leads) |
| Median task time | 2m 40s | 2m 44s | 4s faster (GPT-6 Astra leads) |
| Approx. task cost | $0.046 / task | $0.018 / task | $0.028 / task lower (GPT-6 Sol 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. GPT-6 Sol: 0.4% of ChatGPT Plus (1.8% / 5h, 0.4% / 1w) per good solve. Its weekly limit holds about 6 of the week's 33.6 5h windows. 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 GPT-6 Sol?
GPT-6 Astra clears higher: tier 2 of 5 versus tier 1 for GPT-6 Sol 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 GPT-6 Sol?
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). GPT-6 Sol used 7% of ChatGPT Plus's weekly limit per pass, $0.017 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~1.4% of ChatGPT Pro 5x's weekly limit (est, about $0.017 per task). Per task, GPT-6 Sol is about 3.1x cheaper ($0.017 vs $0.053).
What do GPT-6 Astra and GPT-6 Sol cost a month?
GPT-6 Astra runs on ChatGPT Plus at $20/month (public price as of 2026-07-20). GPT-6 Sol runs on ChatGPT Plus at $20/month (public price as of 2026-07-20).