Opus 5.5 beats GPT-6 Astra on most benchmarks at lower cost

The post says Opus 5.5 performs at the level of Claude Fable 5.1, beats GPT-6 Astra on most benchmarks, and costs 40% less to run than Opus 5.

Itsvishal

@itsvishaltwtArchived 2026.09.28Originally posted 2026.09.27

Opus 5.5 beats GPT-6 Astra on most benchmarks at lower cost

Itsvishal @itsvishaltwtOriginally posted 2026.09.27

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Opus 5.5 is looking seriously strong 👀 → Performs at the level of Claude Fable 5.1 → Beats GPT-6 Astra on most benchmarks → Costs 40% less to run than Opus 5

x.com/itsvishaltwt/status/2104055074612019386Archived 2026.09.28 10:04

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