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Claude Opus 5.5 vs Gemini 4 Argon

Updated Oct 24, 2026. Checked daily.

These are the current #1 and the alternative for Writing & Marketing.

#1

Claude Opus 5.5

Anthropic

Evidence
LMArena Creative Writing 1520
Cost
Pro is $20/month, or $17/month billed yearly. API is $4 per million input tokens and $20 per million output.
Access
Paid plan
Privacy
Anthropic says Free, Pro, and Max chats are used for training only if you allow it, and you choose at signup. The toggle has been reported as on by default, so check it. Settings, then Privacy. Turn off Help improve Claude.
Pick this if
Pick this when the writing itself has to sound like a person.

Alternative

Gemini 4 Argon

Google

Evidence
LMArena Creative Writing 1512
Cost
Google AI Pro is $19.99/month. API is $2/M input and $10/M output tokens until Nov 30, 2026, then $4/$20.
Access
Paid plan
Privacy
Yes for adults. Gemini Apps Activity is on by default, and those chats can be used to improve Google AI. Gemini Apps Activity, turn off Keep Activity. Safety review can still apply.
Pick this if
Pick this when you want a strong draft and already use Gemini.

Questions

Which is better for writing & marketing, Claude Opus 5.5 or Gemini 4 Argon?

Claude Opus 5.5 leads writing & marketing on LMArena Creative Writing. Claude Opus 5.5 scores 1520 and Gemini 4 Argon scores 1512 on that signal.

Which is cheaper?

Claude Opus 5.5 costs Pro is $20/month, or $17/month billed yearly. API is $4 per million input tokens and $20 per million output. Gemini 4 Argon costs Google AI Pro is $19.99/month. API is $2/M input and $10/M output tokens until Nov 30, 2026, then $4/$20. These are the stored prices, not a guess about which plan is cheaper for you.

Which is more private?

Claude Opus 5.5: Anthropic says Free, Pro, and Max chats are used for training only if you allow it, and you choose at signup. The toggle has been reported as on by default, so check it. Gemini 4 Argon: Yes for adults. Gemini Apps Activity is on by default, and those chats can be used to improve Google AI.