/AI5h ago

Mark Chen says GPT-5.5 outperforms Claude Opus 4.8 by 20.7% at half the cost and twice the speed

GPT-5.5 succeeded on 12 additional tasks during testing.

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Ryan Shea
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Mark Chen#71
Original postGarry Tan#270
Ryan Shea@ryaneshea

http://x.com/i/article/2061935366655905792

3:24 PM · Jun 2, 2026 · 9K Views
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Nicolas Bustamante@nicbstme

The big story here is that GPT 5.5 (high/xhigh) outperforms claude-opus-4.8 (max/xhigh) by 20.7% succeeding on 12 additional tasks!

More impressive: GPT is roughly half the cost and twice as fast.

OpenAI is back in the game. Overall, this competition is healthy for the industry. I'd love to see a third player rise to the top of the leaderboard!

Datacurve@datacurve

Opus 4.8 is now on DeepSWE.

On the default high thinking effort, it scores 6% higher than Opus 4.7 xhigh, while also lowering average cost per task.

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Mark Chen says GPT-5.5 outperforms Claude Opus 4.8 by 20.7% at half the cost and twice the speed · Digg