GPT-5.6 Terra vs Grok 4.7
Grok 4.7 leads overall, C- to D+. GPT-5.6 Terra is about 6.0x cheaper per task. By suite, GPT-5.6 Terra takes real-world issues (D+ to D) and spec planning is even at C. Take GPT-5.6 Terra anyway when you want the side that is cheaper per task, faster on real-world issues and ahead 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 Terra
Grok 4.7 leads overall, C- to D+. By suite: GPT-5.6 Terra takes real-world issues, D+ to D (50% vs 47% capability); spec planning is even at C (68% vs 68% capability); Grok 4.7 takes vibe coding, C to F (64% vs 34% capability). GPT-5.6 Terra used 2% of ChatGPT Pro 5x's weekly limit per pass, $0.024 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 Terra is about 6.0x cheaper ($0.024 vs $0.145). GPT-5.6 Terra is faster on real-world issues: a median task takes 3m 29s against 6m 57s. Both finished every task on it. Reasons to pick GPT-5.6 Terra anyway: it is cheaper per task ($0.024 vs $0.145), it is faster on real-world issues (3m 29s vs 6m 57s median) and it leads on real-world issues (D+ to D).
Changed since W38: GPT-5.6 Terra: real-world issues usage 1% to 2% of the weekly limit, spec planning C- to C, vibe coding D- to F; Grok 4.7 has one graded week under this version (W39).
| Dimension | GPT-5.6 Terra | Grok 4.7 | Advantage |
|---|---|---|---|
| Capability | 50% | 47% | +3% (GPT-5.6 Terra leads) |
| Median task time | 3m 29s | 6m 57s | 3m 28s faster (GPT-5.6 Terra leads) |
| Approx. task cost | $0.031 / task | $0.077 / task | $0.046 / task lower (GPT-5.6 Terra leads) |
GPT-5.6 Terra: 2.0% of ChatGPT Pro 5x (2.0% / 1w) 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 Terra | Grok 4.7 | Advantage |
|---|---|---|---|
| Capability | 68% | 68% | +0% (Grok 4.7 leads) |
| Median task time | 5m 34s | 37m 24s | 31m 51s faster (GPT-5.6 Terra leads) |
| Approx. task cost | <$0.057 / task | $0.402 / task | $0.345 / task lower (GPT-5.6 Terra leads) |
GPT-5.6 Terra: 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 Terra | Grok 4.7 | Advantage |
|---|---|---|---|
| Capability | 34% | 64% | +30% (Grok 4.7 leads) |
| Median task time | 5m 32s | 11m 10s | 5m 38s faster (GPT-5.6 Terra leads) |
| Approx. task cost | <$0.230 / task | $0.092 / task | $0.138 / task lower (Grok 4.7 leads) |
GPT-5.6 Terra: 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 Terra or Grok 4.7?
Grok 4.7 clears higher: tier 4 of 5 versus tier 2 for GPT-5.6 Terra 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 Terra or Grok 4.7?
GPT-5.6 Terra used 2% of ChatGPT Pro 5x's weekly limit per pass, $0.024 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 Terra is about 6.0x cheaper ($0.024 vs $0.145).
What do GPT-5.6 Terra and Grok 4.7 cost a month?
GPT-5.6 Terra 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).