Claude Haiku 4.5 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GPT-6 Sol was superseded by GPT-6.1 Sol.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 Sol leads overall, C- to F. Claude Haiku 4.5 is about 1.4x cheaper per task. By suite, GPT-6 Sol takes real-world issues (C- to D-) and spec planning (C- to F). Take Claude Haiku 4.5 anyway when you want the side that is cheaper per task.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 Haiku 4.5
GPT-6 Sol leads overall, C- to F. By suite: GPT-6 Sol takes real-world issues, C- to D- (55% vs 37% capability); GPT-6 Sol takes spec planning, C- to F (60% vs 21% capability); GPT-6 Sol takes vibe coding, C- to F (61% vs 22% capability). Claude Haiku 4.5 used 1% of Claude Max 5x's weekly limit per pass, $0.012 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, Claude Haiku 4.5 is about 1.4x cheaper ($0.012 vs $0.017). GPT-6 Sol is faster on real-world issues: a median task takes 1m 41s against 3m 8s. Both finished every task on it. Reasons to pick Claude Haiku 4.5 anyway: it is cheaper per task ($0.012 vs $0.017).
Changed since W39: Claude Haiku 4.5: real-world issues D+ to D-; 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 Haiku 4.5 | GPT-6 Sol | Advantage |
|---|---|---|---|
| Capability | 37% | 55% | +18% (GPT-6 Sol leads) |
| Median task time | 3m 8s | 1m 41s | 1m 27s faster (GPT-6 Sol leads) |
| Approx. task cost | $0.015 / task | $0.015 / task | Even |
Claude Haiku 4.5: 8.0% of Claude Max 5x (8.0% / 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 Haiku 4.5 | GPT-6 Sol | Advantage |
|---|---|---|---|
| Capability | 21% | 60% | +40% (GPT-6 Sol leads) |
| Median task time | 2m 8s | 2m 58s | 49s faster (Claude Haiku 4.5 leads) |
| Approx. task cost | $0.002 / task | $0.023 / task | $0.021 / task lower (Claude Haiku 4.5 leads) |
Claude Haiku 4.5: 1.0% of Claude Max 5x (1.0% / 5h) 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 Haiku 4.5 | GPT-6 Sol | Advantage |
|---|---|---|---|
| Capability | 22% | 61% | +39% (GPT-6 Sol leads) |
| Median task time | 4m 4s | 2m 44s | 1m 20s faster (GPT-6 Sol leads) |
| Approx. task cost | $0.009 / task | $0.018 / task | $0.010 / task lower (Claude Haiku 4.5 leads) |
Claude Haiku 4.5: 1.3% of Claude Max 5x (1.3% / 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 Haiku 4.5 or GPT-6 Sol?
Claude Haiku 4.5 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 2026-09-28.
Which is cheaper per task, Claude Haiku 4.5 or GPT-6 Sol?
Claude Haiku 4.5 used 1% of Claude Max 5x's weekly limit per pass, $0.012 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, Claude Haiku 4.5 is about 1.4x cheaper ($0.012 vs $0.017).
What do Claude Haiku 4.5 and GPT-6 Sol cost a month?
Claude Haiku 4.5 runs on Claude Max 5x at $100/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).