gpt-6IMAGE

Tester says Opus 5.5 beats GPT-6 Astra in comparisons

The author shares output from their own tests, says Opus 5.5 performs clearly better than Astra and costs less, and speculates that Fable 5.5 will be stronger still.

J A Z I I

@notjaziiArchived 2026.09.23Originally posted 2026.09.23

Tester says Opus 5.5 beats GPT-6 Astra in comparisons (image 1 of 2)

Tester says Opus 5.5 beats GPT-6 Astra in comparisons (image 2 of 2)

J A Z I I @notjaziiOriginally posted 2026.09.23

Open original on X

anthropic won big today everyone is comparing opus 5.5 to gpt 6 astra and from the tests i’ve run, opus is looking way better can’t believe anthropic pulled this off while making it cheaper too keep in mind that opus is second model in claude family and still mogs openai's astra now imagine how good fable 5.5 is gonna be here’s output from one of my test, you can already see huge difference in bboth opus is left one and astra is right now

x.com/notjazii/status/2102499296512025026Archived 2026.09.23 10:26