Claude Opus 5.5 vs Gemini 4 Argon

Short answer: neither wins at everything.

Pick Claude Opus 5.5 if you need the strongest Claude for long documents, writing and coding.

Pick Gemini 4 Argon if you want Google's newest top model, which reads text, pictures, video and audio.

Claude Opus 5.5 vs Gemini 4 Argon side by side

	Claude Opus 5.5	Gemini 4 Argon
What it is	Anthropic's top model	Google's newest top model
Made by	Anthropic	Google
Price	Developer price: $4 in and $20 out per million tokens	Developer price: $2 in and $10 out per million tokens
Good at	Hector's pick for long documents and writing; Best for: long documents, writing, coding; Reads up to 1,000,000 tokens at once; Reads: text, image, PDFs	Reads up to 1,048,576 tokens at once; Reads: text, image, video, audio, PDFs
Privacy	Not listed in our data	Paid developer service tier: from Oct 26, 2026, new projects store Generate Content requests by default (store=true); existing projects keep their setting. Opt out with store=false per request or turn off logging in the Logs and Datasets settings
Where it runs	Claude Pro/Max	Google AI Pro/Ultra
Status	Current. Retirement not sooner than Sep 22, 2027. Fast mode (up to ~2.5x faster output, $8/$40 per million tokens) is open to all developer service users since Oct 15, 2026	Current. Generally available Oct 13, 2026. developer service price doubles Dec 1, 2026: $2/$10 per million tokens through Nov 30, then $4/$20. Not on the developer service free tier. Also in Google Antigravity (desktop app and command line) for Google AI Pro and Ultra subscribers (since Oct 13, per Google's Antigravity blog)
Sources	platform.claude.com · claude.com · models.dev · platform.claude.com (2) · platform.claude.com (3)	gemini.google · models.dev · ai.google.dev · ai.google.dev (2) · antigravity.google

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Questions people ask

Is Claude Opus 5.5 or Gemini 4 Argon better?

It depends on what you do. Pick Claude Opus 5.5 if you need the strongest Claude for long documents, writing and coding. Pick Gemini 4 Argon if you want Google's newest top model, which reads text, pictures, video and audio.

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.