Claude Fable 5.1 vs Grok 4.7.
Verdict by category, tale of the tape, shared benchmarks only, and cost at three workloads — all from the tracked data.
Verdict by category
| Category | Claude Fable 5.1 | Grok 4.7 | Winner |
|---|---|---|---|
| League Score | 97.3 | 66.9 | Claude Fable 5.1 |
| Coding (SWE-bench %) | — | — | — |
| Reasoning (GPQA %) | 93.7 | — | — |
| Context (tokens) | 1000000 | 500000 | Claude Fable 5.1 |
| Speed (tok/s) | — | 87.6 | — |
| Price (blended $/1M) | $20.00 | $3.00 | Grok 4.7 (cheaper) |
Tale of the tape
| Spec | Claude Fable 5.1 | Grok 4.7 |
|---|---|---|
| Maker | Anthropic | xAI (SpaceXAI) |
| Released | Sep 1, 2026 | Sep 21, 2026 |
| League Score | 97 | 67 |
| Context | 1,000,000 tokens | 500,000 tokens |
| Max output | 128,000 | — |
| $/1M input | $10.00 | $2.00 |
| $/1M output | $50.00 | $6.00 |
| Weights | Closed | Closed |
| Speed | — | 87.6 t/s |
Head-to-head benchmarks (shared only)
| Benchmark | Claude Fable 5.1 | Grok 4.7 |
|---|---|---|
| LiveBench overall | 88.0 | 74.1 |
Cost at three workloads
| Workload | Claude Fable 5.1 | Grok 4.7 |
|---|---|---|
| Light — 1M in / 250K out | $22.50 | $3.50 |
| Standard — 10M in / 2.5M out | $225.00 | $35.00 |
| Long-context — 50M in / 5M out | $750.00 | $130.00 |
The pick
Pick Claude Fable 5.1 if you want the higher overall League Score; you need the bigger context window.
Pick Grok 4.7 if you want the lower running cost.
All figures from the model database — sources and dates on each model page. Cost your own workload or compare a different pair.
Frequently asked questions
Which is better overall, Claude Fable 5.1 or Grok 4.7?
Claude Fable 5.1 leads on overall League Score, 97 to 67 — a gap of 30 points on a composite of sourced benchmarks. That is overall form, not every category: check the per-category verdicts before choosing.
Which is cheaper, Claude Fable 5.1 or Grok 4.7?
Grok 4.7 is cheaper: $3.00 vs $20.00 blended per 1M tokens (3:1 input/output mix) — about 6.7x less per token.
Which has the bigger context window, Claude Fable 5.1 or Grok 4.7?
Claude Fable 5.1, with 1M of context against 500K for Grok 4.7.
Are Claude Fable 5.1 and Grok 4.7 open source?
Claude Fable 5.1 is closed weights — API access only; Grok 4.7 is closed weights — API access only.