WhichAI / Compare / Claude Opus 4.8 vs GPT-5.5

Claude Opus 4.8vsGPT-5.5

Claude Opus 4.8 scores higher on the October 14, 2026 index. Full context below: price, context window, strengths and honest limits. Verified October 14, 2026.

Claude Opus 4.8

GPT-5.5

Provider

AA index

41.8

38.4

Released

2026-05-27

2026-04

Context

1.05M

Price $/1M

$5 / $25

$5 / $30

Access

Claude Pro $20/mo · API

Free (limited messages) · Plus $20/mo · Go ~$8/mo · API

n/a = not published or not yet verified. Scores marked ~ are WhichAI estimates and should not be compared 1:1 with measured scores.

In one line each

Claude Opus 4.8: The leader on real-repo coding when it shipped (SWE-bench Pro 69.2%) and still a serious software workhorse, now at a price its successors undercut. Worth choosing deliberately rather than by default.

GPT-5.5: The April 2026 flagship, still the strongest broad generalist most people can use free: brainstorming, drafting, frontier coding (SWE-bench Verified 88.7%).

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