Claude Opus 5 vs GPT-6.1 Sol
Claude Opus 5 was superseded by Claude Opus 5.5. The grades below are the last ones measured, so read them as history rather than as this week's board. See the current roster.
Both grade C overall. GPT-6.1 Sol is about 1.7x cheaper per task. By suite, real-world issues is even at C- and GPT-6.1 Sol takes spec planning (C+ to C). Both agents run the same private suite cut headless through their own tools, each on its own subscription.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-6.1 Sol vs Claude Opus 5
Both grade C overall. By suite: real-world issues is even at C- (57% vs 57% capability); GPT-6.1 Sol takes spec planning, C+ to C (73% vs 66% capability); vibe coding is even at C+ (72% vs 72% capability). Claude Opus 5 used 2% of Claude Max 5x's weekly limit per pass, $0.024 per task at the listed price. 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). Per task, GPT-6.1 Sol is about 1.7x cheaper ($0.015 vs $0.024). Claude Opus 5 is faster on real-world issues: a median task takes 1m 56s against 3m 26s. Both finished every task on it.
Changed since W32: Claude Opus 5: real-world issues usage 3% to 1% of the weekly limit; GPT-6.1 Sol has one graded week under this version (W40).
| Dimension | Claude Opus 5 | GPT-6.1 Sol | Advantage |
|---|---|---|---|
| Capability | 57% | 57% | Even |
| Median task time | 1m 56s | 3m 26s | 1m 30s faster (Claude Opus 5 leads) |
| Approx. task cost | $0.015 / task | $0.012 / task | $0.003 / task lower (GPT-6.1 Sol leads) |
Claude Opus 5: 21.0% of Claude Max 5x (21.0% / 5h, 1.0% / 1w) per run. Its weekly limit holds about 13.8 of the week's 33.6 5h windows. 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. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | Claude Opus 5 | GPT-6.1 Sol | Advantage |
|---|---|---|---|
| Capability | 66% | 73% | +8% (GPT-6.1 Sol leads) |
| Median task time | 2m 9s | 6m 22s | 4m 14s faster (Claude Opus 5 leads) |
| Approx. task cost | $0.057 / task | $0.023 / task | $0.034 / task lower (GPT-6.1 Sol leads) |
Claude Opus 5: 6.0% of Claude Max 5x (6.0% / 5h, 1.0% / 1w) per run. Its weekly limit holds about 13.8 of the week's 33.6 5h windows. 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. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | Claude Opus 5 | GPT-6.1 Sol | Advantage |
|---|---|---|---|
| Capability | 72% | 72% | Even |
| Median task time | 2m 51s | 4m 55s | 2m 3s faster (Claude Opus 5 leads) |
| Approx. task cost | $0.011 / task | $0.018 / task | $0.007 / task lower (Claude Opus 5 leads) |
Claude Opus 5: 1.6% of Claude Max 5x (1.6% / 5h) per good solve. Its weekly limit holds about 13.8 of the week's 33.6 5h windows. 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. 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, Claude Opus 5 or GPT-6.1 Sol?
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 2026-09-21.
Which is cheaper per task, Claude Opus 5 or GPT-6.1 Sol?
Claude Opus 5 used 2% of Claude Max 5x's weekly limit per pass, $0.024 per task at the listed price. 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). Per task, GPT-6.1 Sol is about 1.7x cheaper ($0.015 vs $0.024).
What do Claude Opus 5 and GPT-6.1 Sol cost a month?
Claude Opus 5 runs on Claude Max 5x at $100/month (public price as of 2026-07-27). GPT-6.1 Sol runs on ChatGPT Plus at $20/month (public price as of 2026-07-20).