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Anthropic releases Claude Opus 5.5, claims it beats GPT-6 Astra on most benchmarks

The new model is positioned against Claude Fable 5.1, claims to beat GPT-6 Astra on most benchmarks, and costs 40% less to run than Opus 5.

AshutoshShrivastava
@ai_for_successArchived 2026.09.23Originally posted 2026.09.23
Anthropic releases Claude Opus 5.5, claims it beats GPT-6 Astra on most benchmarks (image 1 of 2)
Anthropic releases Claude Opus 5.5, claims it beats GPT-6 Astra on most benchmarks (image 2 of 2)
AshutoshShrivastava @ai_for_successOriginally posted 2026.09.23
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Anthropic just dropped Claude Opus 5.5. > 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/ai_for_success/status/2102436528010260978Archived 2026.09.23 10:28
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