Compare / head-to-head
Claude Fable 5vs
Grok 4.5
Claude Fable 5 leads 25 of 27 shared benchmarks. Grok 4.5 is 7.5x cheaper per token. Claude Fable 5 has the larger context window (1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
25 – 2
Claude Fable 5 leads
Cheaper per token
Grok 4.5
7.5x cheaper, input + output
Larger context
Claude Fable 5
1M tokens
Providers
2 providers
Anthropic · xAI
Claude Fable 5
Anthropic · released 2026-06-09
textvision
Quality
Benchmark matrix
27 shared · 17 only Claude Fable 5 · 0 only Grok 4.5| Benchmark | Claude Fable 5 | Grok 4.5 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 27 | ||||
| GPQA Diamond | 85.9% ↗epoch run | 93.4% ↗epoch run | -7.5 pt | Grok 4.5 |
| LMArena Elo | 1504.3 ↗ | 1450.1 ↗ | +54.2 | Claude Fable 5 |
| APEX-Agents (Mercor) | 63.6% ↗ | 56.2% ↗ | +7.4 pt | Claude Fable 5 |
| Chess Puzzles (Epoch AI run) | 41% ↗epoch run | 36% ↗epoch run | +5 pt | Claude Fable 5 |
| DeepSWE v1.1 (Datacurve) | 69.9% ↗ | 53.8% ↗ | +16.1 pt | Claude Fable 5 |
| FrontierMath Tier 4 v2 (Epoch AI run) | 90.2% ↗epoch run | 24.4% ↗epoch run | +65.8 pt | Claude Fable 5 |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 87% ↗epoch run | 57.2% ↗epoch run | +29.8 pt | Claude Fable 5 |
| Furniture Assembly (Epoch AI run) | 35.8% ↗epoch run | 22.5% ↗epoch run | +13.3 pt | Claude Fable 5 |
| LiveBench Agentic Coding (LiveBench) | 62.2% ↗ | 56.5% ↗ | +5.7 pt | Claude Fable 5 |
| LiveBench Coding (LiveBench) | 86% ↗ | 68.6% ↗ | +17.4 pt | Claude Fable 5 |
| LiveBench Data Analysis (LiveBench) | 80.5% ↗ | 73% ↗ | +7.5 pt | Claude Fable 5 |
| LiveBench Instruction Following (LiveBench) | 75.8% ↗ | 71.5% ↗ | +4.3 pt | Claude Fable 5 |
| LiveBench Language (LiveBench) | 90.7% ↗ | 82.8% ↗ | +7.9 pt | Claude Fable 5 |
| LiveBench Mathematics (LiveBench) | 96% ↗ | 90.8% ↗ | +5.2 pt | Claude Fable 5 |
| LiveBench Reasoning (LiveBench) | 89.7% ↗ | 87.2% ↗ | +2.5 pt | Claude Fable 5 |
| LMArena Agent (LMArena) | 0.0821 ↗ | 0.0121 ↗ | +0.1 | Claude Fable 5 |
| LMArena Vision (LMArena) | 1308.8 ↗ | 1279 ↗ | +29.8 | Claude Fable 5 |
| LMArena WebDev (LMArena) | 1625.3 ↗ | 1551.8 ↗ | +73.5 | Claude Fable 5 |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 100% ↗epoch run | 97.8% ↗epoch run | +2.2 pt | Claude Fable 5 |
| SAGE (Vals AI) | 51.9% ↗ | 35% ↗ | +16.9 pt | Claude Fable 5 |
| SimpleBench (SimpleBench) | 81.9% ↗ | 70% ↗ | +11.9 pt | Claude Fable 5 |
| SimpleQA Verified | 70.7% ↗epoch run | 48.3% ↗epoch run | +22.4 pt | Claude Fable 5 |
| SWE-rebench 2026-05-15 to 2026-07-01 (Nebius) | 64.5% ↗ | 63.8% ↗ | +0.7 pt | Claude Fable 5 |
| tau2-bench Banking Knowledge (Sierra) | 39.7% ↗ | 47.9% ↗ | -8.2 pt | Grok 4.5 |
| Terminal-Bench 4.0 (Vals AI) | 41.4% ↗ | 8.6% ↗ | +32.8 pt | Claude Fable 5 |
| Vending-Bench 2 (Andon Labs) | 5680.26 ↗ | 3887.43 ↗ | +1792.8 | Claude Fable 5 |
| WeirdML (Håvard Tveit Ihle) | 91.9% ↗ | 46.4% ↗ | +45.5 pt | Claude Fable 5 |
| Only Claude Fable 5 reports · 17 | ||||
| SWE-bench Verified | 95% ↗ | not reported | — | — |
| AutomationBench | 17.4% ↗ | not reported | — | — |
| Blueprint-Bench 2 | 38.6% ↗ | not reported | — | — |
| CursorBench | 72.9% ↗ | not reported | — | — |
| EBR-bench (Epoch AI run) | 39.5% ↗epoch run | not reported | — | — |
| FrontierCode (Diamond) | 29.3% ↗ | not reported | — | — |
| FrontierSWE V2 (Proximal Labs) | 47% ↗ | not reported | — | — |
| GDP.pdf | 29.8% ↗ | not reported | — | — |
| GSO Opt@1 (GSO) | 76.5% ↗ | not reported | — | — |
| Legal Agent Benchmark (Harvey's Held-Out Set) | 13.3% ↗ | not reported | — | — |
| MirrorCode (Epoch AI run) | 63.9% ↗epoch run | not reported | — | — |
| Mystery Game Puzzles (Epoch AI run) | 52% ↗epoch run | not reported | — | — |
| OfficeQA Pro | 57.9% ↗ | not reported | — | — |
| OSWorld-Verified | 85% ↗ | not reported | — | — |
| OSWorld-Verified (XLANG) | 86% ↗ | not reported | — | — |
| SWE-Bench Pro | 80% ↗ | not reported | — | — |
| Terminal-Bench 2.1 | 84.3% ↗ | not reported | — | — |
| Only Grok 4.5 reports · 0 | ||||
| Grok 4.5 reports nothing Claude Fable 5 does not. | ||||
Scores tagged "epoch" or "matharena" are independent runs, used only where the lab has not published its own; ⚠ marks rows MathArena flags as released after the competition. Higher is better on every row. Δ is Claude Fable 5 minus Grok 4.5 in the benchmark's own unit. "Not reported" means the lab has not published that figure; it is not a zero. ↗ opens the source.
Specs & pricing
Side by side
Official pricing pages and model cards| Spec | Claude Fable 5 | Grok 4.5 | Edge |
|---|---|---|---|
| Context window | 1M tokens | 500K tokens | Claude Fable 5 |
| Max output | 128K tokens | — | — |
| Input price / 1M | $10 ↗ | $2 ↗ | Grok 4.5 |
| Output price / 1M | $50 ↗ | $6 ↗ | Grok 4.5 |
| Cached input / 1M | $1 ↗ | $0.3 ↗ | Grok 4.5 |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $60 | $8 | Grok 4.5 |
| Modalities | text · vision | text · vision | Tie |
| Released | 2026-06-09 | 2026-07-08 | — |
| Cited benchmark scores | 44 | 33 | — |
Reliability
Provider status
Live from /statusMore matchups
Claude Fable 5 vs …
Models sharing the most benchmarksMore matchups
Grok 4.5 vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run Claude Fable 5 and Grok 4.5 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.