Unverified50% confidenceBenchmarkExact time
On GDP Val 2.1, Opus 5.5 achieved an ELO score of 1846, Fable 5.1 scored 1735, and Astra scored 1542.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
9/25/2026
First Seen
Valid until: 12/24/2026
Sources
Related Entities
Related Claims
UnverifiedClaude 5.1 scored 1853 on GDPVal AAV2, surpassing the previous generation's 1723 and also slightly higher than Opus 5.67% similarUnverifiedOpus 5.5 is less token-efficient than Opus 5: Opus 5's max tier uses 73k tokens per task, Fable uses 78k, Opus 5.5's max tier approaches 120k tokens, while GPT-6 Astra only requires 27k.59% similarUnverifiedOn Terminal Bench 4.0, Opus 5.5 scored 66.4%, Astra scored 57.9%, Fable 5.1 scored 55.8%, and the previous generation Opus 5 scored 52.3%.58% similarUnverifiedOpus 5.5 scored 67 on Humanity's Last Exam, Astra scored 57, and Fable 5.1 scored 65.56% similarUnverifiedOn Terminal Bench 3.0, Opus 5 leads with 43.3 versus V4.1's 30.0, and on Humanity's Last Exam, Opus 5 scores 56.3 while V4.1 only reaches 36.8.55% similar
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