Compare / head-to-head
Claude Fable 5vs
GPT-6 Astra
GPT-6 Astra leads 20 of 30 shared benchmarks. Both list the same combined token price. GPT-6 Astra has the larger context window (1.1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
8 – 20
GPT-6 Astra leads · 2 tied
Cheaper per token
Tie
list price, input + output
Larger context
GPT-6 Astra
1.1M tokens
Providers
2 providers
Anthropic · OpenAI
Claude Fable 5
Anthropic · released 2026-06-09
textvision
GPT-6 Astra
OpenAI · released 2026-09-03
textvision
Quality
Benchmark matrix
30 shared · 14 only Claude Fable 5 · 3 only GPT-6 Astra| Benchmark | Claude Fable 5 | GPT-6 Astra | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 30 | ||||
| GPQA Diamond | 85.9% ↗epoch run | 96% ↗ | -10.1 pt | GPT-6 Astra |
| LMArena Elo | 1504.3 ↗ | 1477.1 ↗ | +27.2 | Claude Fable 5 |
| APEX-Agents (Mercor) | 63.6% ↗ | 64.7% ↗ | -1.1 pt | GPT-6 Astra |
| Chess Puzzles (Epoch AI run) | 41% ↗epoch run | 72% ↗epoch run | -31 pt | GPT-6 Astra |
| DeepSWE v1.1 (Datacurve) | 69.9% ↗ | 74.1% ↗ | -4.2 pt | GPT-6 Astra |
| EBR-bench (Epoch AI run) | 39.5% ↗epoch run | 76.2% ↗epoch run | -36.7 pt | GPT-6 Astra |
| FrontierMath Tier 4 v2 (Epoch AI run) | 90.2% ↗epoch run | 97.6% ↗epoch run | -7.4 pt | GPT-6 Astra |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 87% ↗epoch run | 93.7% ↗epoch run | -6.7 pt | GPT-6 Astra |
| FrontierSWE V2 (Proximal Labs) | 47% ↗ | 65.5% ↗ | -18.5 pt | GPT-6 Astra |
| Furniture Assembly (Epoch AI run) | 35.8% ↗epoch run | 80% ↗epoch run | -44.2 pt | GPT-6 Astra |
| GSO Opt@1 (GSO) | 76.5% ↗ | 77.5% ↗ | -1 pt | GPT-6 Astra |
| LiveBench Agentic Coding (LiveBench) | 62.2% ↗ | 57.3% ↗ | +4.9 pt | Claude Fable 5 |
| LiveBench Coding (LiveBench) | 86% ↗ | 80.4% ↗ | +5.6 pt | Claude Fable 5 |
| LiveBench Data Analysis (LiveBench) | 80.5% ↗ | 83% ↗ | -2.5 pt | GPT-6 Astra |
| LiveBench Instruction Following (LiveBench) | 75.8% ↗ | 75.6% ↗ | +0.2 pt | Claude Fable 5 |
| LiveBench Language (LiveBench) | 90.7% ↗ | 89.4% ↗ | +1.3 pt | Claude Fable 5 |
| LiveBench Mathematics (LiveBench) | 96% ↗ | 96.8% ↗ | -0.8 pt | GPT-6 Astra |
| LiveBench Reasoning (LiveBench) | 89.7% ↗ | 92.7% ↗ | -3 pt | GPT-6 Astra |
| LMArena Agent (LMArena) | 0.0821 ↗ | 0.1227 ↗ | 0 | Tie |
| LMArena Vision (LMArena) | 1308.8 ↗ | 1284.3 ↗ | +24.5 | Claude Fable 5 |
| LMArena WebDev (LMArena) | 1625.3 ↗ | 1787.7 ↗ | -162.4 | GPT-6 Astra |
| MirrorCode (Epoch AI run) | 63.9% ↗epoch run | 46.7% ↗epoch run | +17.2 pt | Claude Fable 5 |
| Mystery Game Puzzles (Epoch AI run) | 52% ↗epoch run | 84% ↗epoch run | -32 pt | GPT-6 Astra |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 100% ↗epoch run | 100% ↗epoch run | 0 | Tie |
| SAGE (Vals AI) | 51.9% ↗ | 46.4% ↗ | +5.5 pt | Claude Fable 5 |
| SimpleBench (SimpleBench) | 81.9% ↗ | 86.5% ↗ | -4.6 pt | GPT-6 Astra |
| SimpleQA Verified | 70.7% ↗epoch run | 75.6% ↗epoch run | -4.9 pt | GPT-6 Astra |
| Terminal-Bench 4.0 (Vals AI) | 41.4% ↗ | 59.6% ↗ | -18.2 pt | GPT-6 Astra |
| Vending-Bench 2 (Andon Labs) | 5680.26 ↗ | 15514.7 ↗ | -9834.4 | GPT-6 Astra |
| WeirdML (Håvard Tveit Ihle) | 91.9% ↗ | 93.6% ↗ | -1.7 pt | GPT-6 Astra |
| 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 | — | — |
| GDP.pdf | 29.8% ↗ | not reported | — | — |
| Legal Agent Benchmark (Harvey's Held-Out Set) | 13.3% ↗ | 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 | — | — |
| SWE-rebench 2026-05-15 to 2026-07-01 (Nebius) | 64.5% ↗ | not reported | — | — |
| tau2-bench Banking Knowledge (Sierra) | 39.7% ↗ | not reported | — | — |
| Terminal-Bench 2.1 | 84.3% ↗ | not reported | — | — |
| Only GPT-6 Astra reports · 3 | ||||
| AutomationBench 1.0.6 | not reported | 41.4% ↗ | — | — |
| BALROG (BALROG) | not reported | 68.3% ↗ | — | — |
| Terminal-Bench Science 0.1 | not reported | 64.6% ↗ | — | — |
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-6 Astra 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-6 Astra | Edge |
|---|---|---|---|
| Context window | 1M tokens | 1.1M tokens | GPT-6 Astra |
| Max output | 128K tokens | 128K tokens | Tie |
| Input price / 1M | $10 ↗ | $10 ↗ | Tie |
| Output price / 1M | $50 ↗ | $50 ↗ | Tie |
| Cached input / 1M | $1 ↗ | $1 ↗ | Tie |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $60 | $60 | Tie |
| Modalities | text · vision | text · vision | Tie |
| Released | 2026-06-09 | 2026-09-03 | — |
| Cited benchmark scores | 44 | 39 | — |
Reliability
Provider status
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