Unverified50% confidenceBenchmarkExact time
Anthropic's internal testing showed that Fable 5.1 as an advisor paired with Opus 5.5 executing the main task improved performance by 1.7 percentage points compared with using Opus 5.5 alone, but increased cost by 2.1 times.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/12/2026
First Seen
Valid until: 1/10/2027
Sources
Related Entities
Related Claims
UnverifiedOn the Frontier Code programming benchmark, Opus 5.5 beat Astra using the default tier, with a per-task cost of only one-fifth that of its competitor.76% similarUnverifiedAnthropic launched Claude Opus 5.5, with capabilities close to the flagship Fable 5.1, costs reduced by 40%, and output speed improved by more than 30% compared to Opus 5.74% similarUnverifiedAnthropic officially describes Opus 5.5 as the highest-performing model it has tested to date.72% 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.67% similarUnverifiedUnder high-reasoning-intensity settings such as max, Haiku 5.5's token consumption increases significantly, and the per-task cost may be less economical than GPT-6 Luna.66% similar
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