Claude Opus 5 vs GPT-6 Sol
Claude Opus 5 was superseded by Claude Opus 5.5. GPT-6 Sol was superseded by GPT-6.1 Sol.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.
Claude Opus 5 leads overall, C to C-. GPT-6 Sol is about 1.4x cheaper per task. By suite, real-world issues is even at C- and Claude Opus 5 takes spec planning (C to C-). Take GPT-6 Sol anyway when you want the side that is cheaper per task and 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 Claude Opus 5
Claude Opus 5 leads overall, C to C-. By suite: real-world issues is even at C- (57% vs 55% capability); Claude Opus 5 takes spec planning, C to C- (66% vs 60% capability); Claude Opus 5 takes vibe coding, C+ to C- (72% vs 61% 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 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 1.4x cheaper ($0.017 vs $0.024). GPT-6 Sol is faster on real-world issues: a median task takes 1m 41s against 1m 56s. Both finished every task on it. Reasons to pick GPT-6 Sol anyway: it is cheaper per task ($0.017 vs $0.024) and it is faster on real-world issues (1m 41s vs 1m 56s median).
Changed since the previous graded week: Claude Opus 5: real-world issues usage 3% to 1% of the weekly limit; 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 | Claude Opus 5 | GPT-6 Sol | Advantage |
|---|---|---|---|
| Capability | 57% | 55% | +2% (Claude Opus 5 leads) |
| Median task time | 1m 56s | 1m 41s | 15s faster (GPT-6 Sol leads) |
| Approx. task cost | $0.015 / task | $0.015 / task | Even |
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 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 | Claude Opus 5 | GPT-6 Sol | Advantage |
|---|---|---|---|
| Capability | 66% | 60% | +5% (Claude Opus 5 leads) |
| Median task time | 2m 9s | 2m 58s | 49s faster (Claude Opus 5 leads) |
| Approx. task cost | $0.057 / task | $0.023 / task | $0.034 / task lower (GPT-6 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 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 | Claude Opus 5 | GPT-6 Sol | Advantage |
|---|---|---|---|
| Capability | 72% | 61% | +10% (Claude Opus 5 leads) |
| Median task time | 2m 51s | 2m 44s | 7s faster (GPT-6 Sol 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 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, Claude Opus 5 or GPT-6 Sol?
Claude Opus 5 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 2026-09-21.
Which is cheaper per task, Claude Opus 5 or GPT-6 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 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 1.4x cheaper ($0.017 vs $0.024).
What do Claude Opus 5 and GPT-6 Sol cost a month?
Claude Opus 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).