The frontier benchmark race has narrowed to a three-point spread. as of september 20, claude fable…
the frontier benchmark race has narrowed to a three-point spread. as of september 20, claude fable 5.1 leads benchlm at 84.74, gpt-6 astra sits at 82.81, and claude opus 5 trails at 81.87.
the models are converging faster than the marketing.
Context
BenchLM's overall ranking page, last updated 2 October 2026, shows a composite across 8 benchmark categories with provisional and verified ranks and conditional range columns, and says ranges do not establish confidence in a rank. On that snapshot GPT-6 Astra is 88.8 (rank 1), Claude Opus 5.5 87.8, Claude Sonnet 5.5 83.4, Claude Fable 5.1 82.9 (rank 4) and Claude Opus 5 80.0.
None of the note's 20 September numbers (84.74, 82.81, 81.87) appear on the 2 October page, and that snapshot cannot establish the earlier ones. Different window, not refutation, and the historical figures are unverified. A three-point spread sits inside the stated ranges, so the leads and narrowed to are not statistically established, and the three-point spread inference should not be applied to the older numbers. The composite is not comparable with vendor-published benchmarks. The models are converging faster than the marketing is the author's take.
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- A dated 20 September snapshot before accepting the figures.
Sources
Provenance
The note above is reproduced unedited from the original post, first published on Threads on 21 September 2026 at 00:06 IST. Sources are the papers and datasets the note draws on.
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