GPT-5.6 Luna vs Grok 4.7
GPT-5.6 Luna is no longer on the leaderboard. The grades below are the last ones measured, so read them as history rather than as this week's board. See the current roster.
Grok 4.7 leads overall, C- to D. GPT-5.6 Luna is the cheaper side per task (at most $0.012). By suite, real-world issues is even at D and Grok 4.7 takes spec planning (C to C-). Take GPT-5.6 Luna 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: Grok 4.7 vs GPT-5.6 Luna
Grok 4.7 leads overall, C- to D. By suite: real-world issues is even at D (45% vs 47% capability); Grok 4.7 takes spec planning, C to C- (68% vs 57% capability); Grok 4.7 takes vibe coding, C to F (64% vs 25% capability). GPT-5.6 Luna used <1% of ChatGPT Pro 5x's weekly limit per pass, at most $0.012 per task at the listed price. Grok 4.7 used 12% of SuperGrok Plus's weekly limit per pass, $0.145 per task at the listed price. Per task, GPT-5.6 Luna costs at most $0.012 against Grok 4.7's $0.145, so GPT-5.6 Luna is the cheaper side. GPT-5.6 Luna is faster on real-world issues: a median task takes 3m 7s against 6m 57s. Both finished every task on it. Reasons to pick GPT-5.6 Luna anyway: it is cheaper per task (at most $0.012 vs $0.145) and it is faster on real-world issues (3m 7s vs 6m 57s median).
Changed since W38: GPT-5.6 Luna: spec planning D+ to C-, vibe coding C- to F; Grok 4.7 has one graded week under this version (W39).
| Dimension | GPT-5.6 Luna | Grok 4.7 | Advantage |
|---|---|---|---|
| Capability | 45% | 47% | +2% (Grok 4.7 leads) |
| Median task time | 3m 7s | 6m 57s | 3m 50s faster (GPT-5.6 Luna leads) |
| Approx. task cost | <$0.015 / task | $0.077 / task | $0.061 / task lower (GPT-5.6 Luna leads) |
GPT-5.6 Luna: under 1% of ChatGPT Pro 5x per run. Grok 4.7: 5.0% of SuperGrok Plus (5.0% / 1w) per run. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | GPT-5.6 Luna | Grok 4.7 | Advantage |
|---|---|---|---|
| Capability | 57% | 68% | +12% (Grok 4.7 leads) |
| Median task time | 3m 25s | 37m 24s | 33m 59s faster (GPT-5.6 Luna leads) |
| Approx. task cost | <$0.057 / task | $0.402 / task | $0.345 / task lower (GPT-5.6 Luna leads) |
GPT-5.6 Luna: under 1% of ChatGPT Pro 5x per run. Grok 4.7: 7.0% of SuperGrok Plus (7.0% / 1w) per run. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | GPT-5.6 Luna | Grok 4.7 | Advantage |
|---|---|---|---|
| Capability | 25% | 64% | +39% (Grok 4.7 leads) |
| Median task time | 3m 40s | 11m 10s | 7m 30s faster (GPT-5.6 Luna leads) |
| Approx. task cost | <$0.230 / task | $0.092 / task | $0.138 / task lower (Grok 4.7 leads) |
GPT-5.6 Luna: under 1% of ChatGPT Pro 5x per good solve. Grok 4.7: 0.4% of SuperGrok Plus (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 Luna or Grok 4.7?
Grok 4.7 clears higher: tier 4 of 5 versus tier 1 for GPT-5.6 Luna 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 Luna or Grok 4.7?
GPT-5.6 Luna used <1% of ChatGPT Pro 5x's weekly limit per pass, at most $0.012 per task at the listed price. Grok 4.7 used 12% of SuperGrok Plus's weekly limit per pass, $0.145 per task at the listed price. Per task, GPT-5.6 Luna costs at most $0.012 against Grok 4.7's $0.145, so GPT-5.6 Luna is the cheaper side.
What do GPT-5.6 Luna and Grok 4.7 cost a month?
GPT-5.6 Luna runs on ChatGPT Pro 5x at $100/month (public price as of 2026-09-05). Grok 4.7 runs on SuperGrok Plus at $100/month (public price as of 2026-09-14).