GPT-5.6 Sol vs Grok 4.5
GPT-5.6 Sol was superseded by GPT-6.1 Sol. Grok 4.5 was superseded by Grok 4.7. 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. The two cost about the same per task. By suite, real-world issues is even at C- and Grok 4.5 takes vibe coding (C- to D+). 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: Grok 4.5 vs GPT-5.6 Sol
Both grade C- overall. By suite: real-world issues is even at C- (60% vs 60% capability); Grok 4.5 takes vibe coding, C- to D+ (59% vs 51% capability). Only GPT-5.6 Sol has run spec planning. GPT-5.6 Sol used 3% of ChatGPT Pro 5x's weekly limit per pass, $0.036 per task at the listed price. Grok 4.5 used 6.9% of SuperGrok's weekly limit per pass, $0.032 per task at the listed price. Per task the two cost about the same ($0.036 vs $0.032). Grok 4.5 is faster on real-world issues: a median task takes 3m 9s against 3m 13s. Both finished every task on it.
Changed since the previous graded week: GPT-5.6 Sol: vibe coding C- to D+; Grok 4.5: real-world issues usage 8.0% to 6.9% of the weekly limit.
| Dimension | GPT-5.6 Sol | Grok 4.5 | Advantage |
|---|---|---|---|
| Capability | 60% | 60% | Even |
| Median task time | 3m 13s | 3m 9s | 4s faster (Grok 4.5 leads) |
| Approx. task cost | $0.031 / task | $0.032 / task | $0.001 / task lower (GPT-5.6 Sol leads) |
GPT-5.6 Sol: 2.0% of ChatGPT Pro 5x (2.0% / 1w) per run. Grok 4.5: 6.9% of SuperGrok (6.9% / 1w) per run. Each figure is a share of that agent's own plan, so there is no delta to draw.
Only GPT-5.6 Sol has run this suite, so there is no head-to-head yet.
| Dimension | GPT-5.6 Sol | Grok 4.5 | Advantage |
|---|---|---|---|
| Capability | 51% | 59% | +8% (Grok 4.5 leads) |
| Median task time | 3m 56s | 3m 40s | 17s faster (Grok 4.5 leads) |
| Approx. task cost | $0.092 / task | $0.031 / task | $0.061 / task lower (Grok 4.5 leads) |
GPT-5.6 Sol: 0.4% of ChatGPT Pro 5x (0.4% / 1w) per good solve. Grok 4.5: 0.4% of SuperGrok (0.4% / 1w) per good solve. 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-5.6 Sol or Grok 4.5?
They are even on our ladder: both clear tier 4 of 5 at 60% capability on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-09-21.
Which is cheaper per task, GPT-5.6 Sol or Grok 4.5?
GPT-5.6 Sol used 3% of ChatGPT Pro 5x's weekly limit per pass, $0.036 per task at the listed price. Grok 4.5 used 6.9% of SuperGrok's weekly limit per pass, $0.032 per task at the listed price. Per task the two cost about the same ($0.036 vs $0.032).
What do GPT-5.6 Sol and Grok 4.5 cost a month?
GPT-5.6 Sol runs on ChatGPT Pro 5x at $100/month (public price as of 2026-09-05). Grok 4.5 runs on SuperGrok at $30/month (public price as of 2026-07-20).