GPT-6.1 Sol 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GPT-6 Sol was superseded by GPT-6.1 Sol.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-6.1 Sol leads overall, C to C-. GPT-6.1 Sol is about 1.2x cheaper per task. By suite, real-world issues is even at C- and GPT-6.1 Sol takes spec planning (C+ to C-). Take GPT-6 Sol anyway when you want the side that is faster 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-6.1 Sol
GPT-6.1 Sol leads overall, C to C-. By suite: real-world issues is even at C- (57% vs 55% capability); GPT-6.1 Sol takes spec planning, C+ to C- (73% vs 60% capability); GPT-6.1 Sol takes vibe coding, C+ to C- (72% vs 61% capability). GPT-6.1 Sol used 6% of ChatGPT Plus's weekly limit per pass, $0.015 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~1.2% of ChatGPT Pro 5x's weekly limit (est, about $0.015 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-6.1 Sol is about 1.2x cheaper ($0.015 vs $0.017). GPT-6 Sol is faster on real-world issues: a median task takes 1m 41s against 3m 26s. Both finished every task on it. Reasons to pick GPT-6 Sol anyway: it is faster on real-world issues (1m 41s vs 3m 26s median).
Changed since W39: GPT-6.1 Sol 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-6.1 Sol | GPT-6 Sol | Advantage |
|---|---|---|---|
| Capability | 57% | 55% | +2% (GPT-6.1 Sol leads) |
| Median task time | 3m 26s | 1m 41s | 1m 45s faster (GPT-6 Sol leads) |
| Approx. task cost | $0.012 / task | $0.015 / task | $0.003 / task lower (GPT-6.1 Sol leads) |
GPT-6.1 Sol: 4.0% of ChatGPT Plus (28.0% / 5h, 4.0% / 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-6.1 Sol | GPT-6 Sol | Advantage |
|---|---|---|---|
| Capability | 73% | 60% | +13% (GPT-6.1 Sol leads) |
| Median task time | 6m 22s | 2m 58s | 3m 24s faster (GPT-6 Sol leads) |
| Approx. task cost | $0.023 / task | $0.023 / task | Even |
GPT-6.1 Sol: 2.0% of ChatGPT Plus (9.0% / 5h, 2.0% / 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-6.1 Sol | GPT-6 Sol | Advantage |
|---|---|---|---|
| Capability | 72% | 61% | +10% (GPT-6.1 Sol leads) |
| Median task time | 4m 55s | 2m 44s | 2m 10s faster (GPT-6 Sol leads) |
| Approx. task cost | $0.018 / task | $0.018 / task | Even |
GPT-6.1 Sol: 0.4% of ChatGPT Plus (2.2% / 5h, 0.4% / 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-6.1 Sol or GPT-6 Sol?
GPT-6.1 Sol 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 2026-09-30.
Which is cheaper per task, GPT-6.1 Sol or GPT-6 Sol?
GPT-6.1 Sol used 6% of ChatGPT Plus's weekly limit per pass, $0.015 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~1.2% of ChatGPT Pro 5x's weekly limit (est, about $0.015 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-6.1 Sol is about 1.2x cheaper ($0.015 vs $0.017).
What do GPT-6.1 Sol and GPT-6 Sol cost a month?
GPT-6.1 Sol 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).