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WhichAI / Compare / Claude Opus 4.8 vs GPT-5.5

Claude Opus 4.8vsGPT-5.5

Claude Opus 4.8 scores higher on the July 16 index. Full context below: price, context window, strengths and honest limits. Verified July 26, 2026.

Claude Opus 4.8
GPT-5.5
Provider
Anthropic
OpenAI
AA index
55.7
54.8
Released
n/a
2026-04
Context
1M
n/a
Price $/1M
$5 / $25
n/a
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: #2 on the public AA snapshot and the leader in real-repo coding (SWE-bench Pro 69.2%). For serious software work, still the default answer.

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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