GPT 6 chain-of-thought controlability falls below 10% at 10k tokens, analysis of reports finds
1a3orn · x · 2026-09-04
Blogger 1a3orn compares CoT controlability charts from OpenAI's GPT 6 (Astra) and Ant's Fable 5.1 reports:
- GPT 6 drops to under 10% controlability at 10k tokens (log scale)
- Fable 5.1's report uses characters on the x-axis (tokenizer kept secret); eyeballing the chart gives roughly 50% controlability at 2k tokens (10k characters)
- Fable 5.1 outperforms everything except Mythos Preview, with the same reversal of controlability over time
- Net: no clear winner, but both frontier models degrade sharply as context lengthens
Related event: GPT-6 vs Fable 5.1: CoT Steerability Data Sparks Debate(7 posts)→
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