Claude Fable 5.1 vs Grok 4.7
Both grade C- overall. The two cost about the same per task. By suite, Claude Fable 5.1 takes real-world issues (D+ to D) and spec planning (C+ to C). 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 4.7 vs Claude Fable 5.1
Both grade C- overall. By suite: Claude Fable 5.1 takes real-world issues, D+ to D (53% vs 47% capability); Claude Fable 5.1 takes spec planning, C+ to C (70% vs 68% capability); Grok 4.7 takes vibe coding, C to C- (64% vs 59% capability). Claude Fable 5.1 used 11% of Claude Max 5x's weekly limit per pass, $0.133 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 the two cost about the same ($0.133 vs $0.145). Claude Fable 5.1 is faster on real-world issues: a median task takes 2m 20s against 6m 57s. Both finished every task on it.
| Dimension | Claude Fable 5.1 | Grok 4.7 | Advantage |
|---|---|---|---|
| Capability | 53% | 47% | +7% (Claude Fable 5.1 leads) |
| Median task time | 2m 20s | 6m 57s | 4m 37s faster (Claude Fable 5.1 leads) |
| Approx. task cost | $0.107 / task | $0.077 / task | $0.031 / task lower (Grok 4.7 leads) |
Claude Fable 5.1: 100.0% of Claude Max 5x (100.0% / 5h, 7.0% / 1w) per run. Its weekly limit holds about 14.6 of the week's 33.6 5h windows. 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 | Claude Fable 5.1 | Grok 4.7 | Advantage |
|---|---|---|---|
| Capability | 70% | 68% | +2% (Claude Fable 5.1 leads) |
| Median task time | 6m 1s | 37m 24s | 31m 24s faster (Claude Fable 5.1 leads) |
| Approx. task cost | $0.230 / task | $0.402 / task | $0.172 / task lower (Claude Fable 5.1 leads) |
Claude Fable 5.1: 49.0% of Claude Max 5x (49.0% / 5h, 4.0% / 1w) per run. Its weekly limit holds about 14.6 of the week's 33.6 5h windows. 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 | Claude Fable 5.1 | Grok 4.7 | Advantage |
|---|---|---|---|
| Capability | 59% | 64% | +5% (Grok 4.7 leads) |
| Median task time | 3m 58s | 11m 10s | 7m 12s faster (Claude Fable 5.1 leads) |
| Approx. task cost | $0.138 / task | $0.092 / task | $0.046 / task lower (Grok 4.7 leads) |
Claude Fable 5.1: 6.2% of Claude Max 5x (6.2% / 5h, 0.6% / 1w) per good solve. Its weekly limit holds about 14.6 of the week's 33.6 5h windows. 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, Claude Fable 5.1 or Grok 4.7?
Grok 4.7 clears higher: tier 4 of 5 versus tier 3 for Claude Fable 5.1 on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-09-20.
Which is cheaper per task, Claude Fable 5.1 or Grok 4.7?
Claude Fable 5.1 used 11% of Claude Max 5x's weekly limit per pass, $0.133 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 the two cost about the same ($0.133 vs $0.145).
What do Claude Fable 5.1 and Grok 4.7 cost a month?
Claude Fable 5.1 runs on Claude Max 5x at $100/month (public price as of 2026-07-27). Grok 4.7 runs on SuperGrok Plus at $100/month (public price as of 2026-09-14).