Claude Sonnet 5.5 vs GPT-6 Sol

Short answer: neither wins at everything.

Pick Claude Sonnet 5.5 if you want strong writing and editing at half of Opus's price; it's also on the free Claude plan.

Pick GPT-6 Sol if you're moving off GPT-5.1, since OpenAI names GPT-6 Sol as its replacement.

Claude Sonnet 5.5 vs GPT-6 Sol side by side

	Claude Sonnet 5.5	GPT-6 Sol
What it is	Anthropic's mid-size model	OpenAI model
Made by	Anthropic	OpenAI
Price	Developer price: $2 in and $10 out per million tokens	Developer price: $2 in and $10 out per million tokens
Good at	Best for: writing, editing; Reads up to 1,000,000 tokens at once; Reads: text, image, PDFs	Reads up to 1,050,000 tokens at once; Reads: text, image, PDFs
Where it runs	Claude Free+	ChatGPT Plus/Pro
Status	Current. Not sooner than Sep 28, 2027	Current. OpenAI's named replacement for gpt-5.1, gpt-5.3-codex
Sources	platform.claude.com · claude.com · models.dev	platform.openai.com · chatgpt.com · models.dev

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Questions people ask

Is Claude Sonnet 5.5 or GPT-6 Sol better?

It depends on what you do. Pick Claude Sonnet 5.5 if you want strong writing and editing at half of Opus's price; it's also on the free Claude plan. Pick GPT-6 Sol if you're moving off GPT-5.1, since OpenAI names GPT-6 Sol as its replacement.

How does WhichBot decide?

Hector uses a written rubric: everyday usefulness, cost and free plans, privacy, reliability, ease of use, availability and safety. Rankings are one input, not the answer.

Facts come from the companies' own pages, linked above, and were last checked Oct 28, 2026. Prices are US and can change. Picks are Hector's: no paid picks, sponsors always labeled, and no sponsorship from AI labs. Our policy.