GPT-6 Astra vs Claude Fable 5.1: Benchmark Lead, Production Dead Heat
It-zubair-huss · reddit · 2026-09-07
A developer compares GPT-6 Astra and Claude Fable 5.1 (same price, same 1M context): Astra leads on FrontierMath Tier 4 (97.6% vs 87.8%), AutomationBench (41.4% vs 31.4%), and BenchCAD (95.9% vs 84.3%); Terminal-Bench 4.0 is a tie and Code Arena WebDev differs by only 35 Elo. Fable 5.1 wins OSWorld 2.0 at 77.9%. Advice: benchmarks don't predict production behavior — test prompts on your own stack before migrating.
Related event: Claude Fable 5.1 and GPT-6 Astra Launch 48 Hours Apart at Identical Prices(9 posts)→
More from Models
- Benchmark scores drop from 89% to 19% on new evals — how benchmaxxing breaks leaderboard trust — airesearch12 · 2026-09-11
- Developer Building a Unified Leaderboard of All Model Benchmark Scores — airesearch12 · 2026-09-11
- Rumor claims Kimi faked performance by serving Claude; DeepSeek new model surprises in evals — realsohamparekh · 2026-09-11
- GPT-5.6 writes well but is instantly forgettable, user complains — BasedRaddka · 2026-09-11
- Opus Refuses Protein Research Codebase Over 'Safety' Concerns, Dev Considers Rolling His Own — josephdviviano · 2026-09-11
- User Hails Unconfirmed 'DeepSeek 4.1 Flash' as an Inflection Point in LLMs — himanshustwts · 2026-09-11