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Claude Sonnet 5vsGPT-5.5

GPT-5.5 scores higher on the October 14, 2026 index. Full context below: price, context window, strengths and honest limits. Verified October 14, 2026.

Claude Sonnet 5
GPT-5.5
Provider
Anthropic
OpenAI
AA index
38.2
38.4
Released
2026-06-30
2026-04
Context
1M
1.05M
Price $/1M
$2 / $10
$5 / $30
Access
FREE tier of claude.ai · 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 Sonnet 5: The strongest free option on the market - frontier-adjacent writing and coding quality at zero cost. Best zero-budget daily driver for text work.

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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