Claude Opus 5.5 vs GPT-6 Sol
Claude Opus 5.5 leads overall, C+ to D+. The two cost about the same per task. By suite, Claude Opus 5.5 takes real-world issues (C- to D-) and spec planning (C+ to C). The data gives no reason to pick GPT-6 Sol over Claude Opus 5.5 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: GPT-6 Sol vs Claude Opus 5.5
Claude Opus 5.5 leads overall, C+ to D+. By suite: Claude Opus 5.5 takes real-world issues, C- to D- (60% vs 38% capability); Claude Opus 5.5 takes spec planning, C+ to C (69% vs 64% capability); Claude Opus 5.5 takes vibe coding, B to D+ (85% vs 51% capability). Claude Opus 5.5 used 1% of Claude Max 5x's weekly limit per pass, $0.012 per task at the listed price. GPT-6 Sol used 5% of ChatGPT Plus's weekly limit per pass, $0.012 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~1% of ChatGPT Pro 5x's weekly limit (est, about $0.012 per task). Per task the two cost about the same ($0.012 vs $0.012). Claude Opus 5.5 is faster on real-world issues: a median task takes 2m 18s against 2m 44s. Both finished every task on it. The data gives no reason to pick GPT-6 Sol over Claude Opus 5.5 this week.
| Dimension | Claude Opus 5.5 | GPT-6 Sol | Advantage |
|---|---|---|---|
| Capability | 60% | 38% | +22% (Claude Opus 5.5 leads) |
| Median task time | 2m 18s | 2m 44s | 26s faster (Claude Opus 5.5 leads) |
| Approx. task cost | $0.015 / task | $0.012 / task | $0.003 / task lower (GPT-6 Sol leads) |
Claude Opus 5.5: 16.0% of Claude Max 5x (16.0% / 5h, 1.0% / 1w) per run. Its weekly limit holds about 14.6 of the week's 33.6 5h windows. GPT-6 Sol: 4.0% of ChatGPT Plus (37.0% / 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 5.5 | GPT-6 Sol | Advantage |
|---|---|---|---|
| Capability | 69% | 64% | +5% (Claude Opus 5.5 leads) |
| Median task time | 3m 45s | 2m 23s | 1m 22s faster (GPT-6 Sol leads) |
| Approx. task cost | $0.010 / task | $0.011 / task | $0.001 / task lower (Claude Opus 5.5 leads) |
Claude Opus 5.5: 6.0% of Claude Max 5x (6.0% / 5h) per run. Its weekly limit holds about 14.6 of the week's 33.6 5h windows. GPT-6 Sol: 1.0% of ChatGPT Plus (8.0% / 5h, 1.0% / 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 5.5 | GPT-6 Sol | Advantage |
|---|---|---|---|
| Capability | 85% | 51% | +34% (Claude Opus 5.5 leads) |
| Median task time | 2m 27s | 3m 4s | 38s faster (Claude Opus 5.5 leads) |
| Approx. task cost | $0.046 / task | $0.018 / task | $0.028 / task lower (GPT-6 Sol leads) |
Claude Opus 5.5: 0.8% of Claude Max 5x (0.8% / 5h, 0.2% / 1w) per good solve. Its weekly limit holds about 14.6 of the week's 33.6 5h windows. GPT-6 Sol: 0.4% of ChatGPT Plus (2.4% / 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 5.5 or GPT-6 Sol?
Claude Opus 5.5 clears higher: tier 4 of 5 versus tier 1 for GPT-6 Sol on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-09-23.
Which is cheaper per task, Claude Opus 5.5 or GPT-6 Sol?
Claude Opus 5.5 used 1% of Claude Max 5x's weekly limit per pass, $0.012 per task at the listed price. GPT-6 Sol used 5% of ChatGPT Plus's weekly limit per pass, $0.012 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~1% of ChatGPT Pro 5x's weekly limit (est, about $0.012 per task). Per task the two cost about the same ($0.012 vs $0.012).
What do Claude Opus 5.5 and GPT-6 Sol cost a month?
Claude Opus 5.5 runs on Claude Max 5x at $100/month (public price as of 2026-07-27). GPT-6 Sol runs on ChatGPT Plus at $20/month (public price as of 2026-07-20).