Compare / head-to-head
Claude Fable 5vs
GPT-5.5
Claude Fable 5 leads 22 of 30 shared benchmarks. GPT-5.5 is 1.7x cheaper per token. Both offer a 1M-token context window.
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
22 – 6
Claude Fable 5 leads · 2 tied
Cheaper per token
GPT-5.5
1.7x cheaper, input + output
Larger context
Tie
both 1M tokens
Providers
2 providers
Anthropic · OpenAI
Claude Fable 5
Anthropic · released 2026-06-09
textvision
Quality
Benchmark matrix
30 shared · 14 only Claude Fable 5 · 14 only GPT-5.5| Benchmark | Claude Fable 5 | GPT-5.5 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 30 | ||||
| GPQA Diamond | 85.9% ↗epoch run | 90.7% ↗epoch run | -4.8 pt | GPT-5.5 |
| LMArena Elo | 1504.3 ↗ | 1465.6 ↗ | +38.7 | Claude Fable 5 |
| APEX-Agents (Mercor) | 63.6% ↗ | 55.1% ↗ | +8.5 pt | Claude Fable 5 |
| Chess Puzzles (Epoch AI run) | 41% ↗epoch run | 26% ↗epoch run | +15 pt | Claude Fable 5 |
| DeepSWE v1.1 (Datacurve) | 69.9% ↗ | 67% ↗ | +2.9 pt | Claude Fable 5 |
| EBR-bench (Epoch AI run) | 39.5% ↗epoch run | 34.3% ↗epoch run | +5.2 pt | Claude Fable 5 |
| FrontierMath Tier 4 v2 (Epoch AI run) | 90.2% ↗epoch run | 72.5% ↗epoch run | +17.7 pt | Claude Fable 5 |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 87% ↗epoch run | 85.3% ↗epoch run | +1.7 pt | Claude Fable 5 |
| Furniture Assembly (Epoch AI run) | 35.8% ↗epoch run | 44.2% ↗epoch run | -8.4 pt | GPT-5.5 |
| GSO Opt@1 (GSO) | 76.5% ↗ | 37.3% ↗ | +39.2 pt | Claude Fable 5 |
| LiveBench Agentic Coding (LiveBench) | 62.2% ↗ | 54% ↗ | +8.2 pt | Claude Fable 5 |
| LiveBench Coding (LiveBench) | 86% ↗ | 82.1% ↗ | +3.9 pt | Claude Fable 5 |
| LiveBench Data Analysis (LiveBench) | 80.5% ↗ | 81.6% ↗ | -1.1 pt | GPT-5.5 |
| LiveBench Instruction Following (LiveBench) | 75.8% ↗ | 70.7% ↗ | +5.1 pt | Claude Fable 5 |
| LiveBench Language (LiveBench) | 90.7% ↗ | 87.4% ↗ | +3.3 pt | Claude Fable 5 |
| LiveBench Mathematics (LiveBench) | 96% ↗ | 95.9% ↗ | +0.1 pt | Claude Fable 5 |
| LiveBench Reasoning (LiveBench) | 89.7% ↗ | 89.7% ↗ | 0 | Tie |
| LMArena Agent (LMArena) | 0.0821 ↗ | 0.0415 ↗ | 0 | Tie |
| LMArena Vision (LMArena) | 1308.8 ↗ | 1286.5 ↗ | +22.3 | Claude Fable 5 |
| MirrorCode (Epoch AI run) | 63.9% ↗epoch run | 10% ↗epoch run | +53.9 pt | Claude Fable 5 |
| Mystery Game Puzzles (Epoch AI run) | 52% ↗epoch run | 56% ↗epoch run | -4 pt | GPT-5.5 |
| OSWorld-Verified | 85% ↗ | 78.7% ↗ | +6.3 pt | Claude Fable 5 |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 100% ↗epoch run | 84.4% ↗epoch run | +15.6 pt | Claude Fable 5 |
| SAGE (Vals AI) | 51.9% ↗ | 51.5% ↗ | +0.4 pt | Claude Fable 5 |
| SimpleBench (SimpleBench) | 81.9% ↗ | 69% ↗ | +12.9 pt | Claude Fable 5 |
| SimpleQA Verified | 70.7% ↗epoch run | 63% ↗epoch run | +7.7 pt | Claude Fable 5 |
| SWE-Bench Pro | 80% ↗ | 58.6% ↗ | +21.4 pt | Claude Fable 5 |
| tau2-bench Banking Knowledge (Sierra) | 39.7% ↗ | 44.6% ↗ | -4.9 pt | GPT-5.5 |
| Vending-Bench 2 (Andon Labs) | 5680.26 ↗ | 7523.84 ↗ | -1843.6 | GPT-5.5 |
| WeirdML (Håvard Tveit Ihle) | 91.9% ↗ | 84.9% ↗ | +7 pt | Claude Fable 5 |
| Only Claude Fable 5 reports · 14 | ||||
| SWE-bench Verified | 95% ↗ | not reported | — | — |
| AutomationBench | 17.4% ↗ | not reported | — | — |
| Blueprint-Bench 2 | 38.6% ↗ | not reported | — | — |
| CursorBench | 72.9% ↗ | not reported | — | — |
| FrontierCode (Diamond) | 29.3% ↗ | not reported | — | — |
| FrontierSWE V2 (Proximal Labs) | 47% ↗ | not reported | — | — |
| GDP.pdf | 29.8% ↗ | not reported | — | — |
| Legal Agent Benchmark (Harvey's Held-Out Set) | 13.3% ↗ | not reported | — | — |
| LMArena WebDev (LMArena) | 1625.3 ↗ | not reported | — | — |
| OfficeQA Pro | 57.9% ↗ | not reported | — | — |
| OSWorld-Verified (XLANG) | 86% ↗ | not reported | — | — |
| SWE-rebench 2026-05-15 to 2026-07-01 (Nebius) | 64.5% ↗ | not reported | — | — |
| Terminal-Bench 2.1 | 84.3% ↗ | not reported | — | — |
| Terminal-Bench 4.0 (Vals AI) | 41.4% ↗ | not reported | — | — |
| Only GPT-5.5 reports · 14 | ||||
| AIME 2026 | not reported | 100% ↗matharena ⚠ | — | — |
| ARC-AGI-1 (Verified) | not reported | 95% ↗ | — | — |
| ARC-AGI-2 (Verified) | not reported | 85% ↗ | — | — |
| BrowseComp | not reported | 84.4% ↗ | — | — |
| FrontierMath Tier 1-3 | not reported | 51.7% ↗ | — | — |
| FrontierMath Tier 4 | not reported | 35.4% ↗ | — | — |
| GDPval (wins or ties) | not reported | 84.9% ↗ | — | — |
| MCP Atlas | not reported | 75.3% ↗ | — | — |
| MMMU-Pro (no tools) | not reported | 81.2% ↗ | — | — |
| MMMU-Pro (with tools) | not reported | 83.2% ↗ | — | — |
| Tau2-bench Telecom | not reported | 98% ↗ | — | — |
| Terminal-Bench 2.0 | not reported | 82.7% ↗ | — | — |
| Toolathlon | not reported | 55.6% ↗ | — | — |
| Toolathlon-Verified (HKUST) | not reported | 73.5% ↗ | — | — |
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 GPT-5.5 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 | GPT-5.5 | Edge |
|---|---|---|---|
| Context window | 1M tokens | 1M tokens | Tie |
| Max output | 128K tokens | 128K tokens | Tie |
| Input price / 1M | $10 ↗ | $5 ↗ | GPT-5.5 |
| Output price / 1M | $50 ↗ | $30 ↗ | GPT-5.5 |
| Cached input / 1M | $1 ↗ | $0.5 ↗ | GPT-5.5 |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $60 | $35 | GPT-5.5 |
| Modalities | text · vision | text · vision | Tie |
| Released | 2026-06-09 | 2026-04-23 | — |
| Cited benchmark scores | 44 | 50 | — |
Reliability
Provider status
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Which one wins on your data?
Public benchmarks are a starting point. Run Claude Fable 5 and GPT-5.5 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.