Hands-on: GPT-6 Max tops math/ML but tiny context hurts, Fable 5.1 wins long agentic tasks
MParakhin · x · 2026-09-06
A user's extensive hands-on comparison:
- GPT-6 Max is called the best model ever for math/ML, beating 5.2 Pro; 6 Pro has also appeared in the web interface.
- GPT-6 is badly hampered by its tiny context window — like talking to a super-smart Dory.
- Fable 5.1 remains best on long agentic tasks, with better instruction following and more elegant coding solutions.
- In the replies, someone notes you can raise the context window in the Codex config, at the cost of linearly consuming usage and affecting cache.
Related event: GPT-6 Tops Math but Small Context Hurts Long Tasks(4 posts)→
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