Compare / Gemini 4 Argon vs Claude Opus 5.5

Gemini 4 Argon vs Claude Opus 5.5

A side by side look at published price, context window and benchmark scores for these two models. Every number links to its source. A missing field means that model has not published a number for that metric.

What this means for your work

Claude Opus 5.5 costs twice as much per token ($4 in, $20 out vs $2 and $10) and scores higher on the Artificial Analysis index (58 vs 53) and LMArena WebDev. Gemini 4 Argon starts answering much sooner at the settings tested (about 48 seconds vs 741). For writing and research at volume, Argon's price adds up; for building sites and apps, Opus scores higher, so test both on a real task.

Input price

Lower is better

Gemini 4 Argon $2.00

Claude Opus 5.5 $4.00

Gemini 4 Argon: source Vendor pricing page, as of Oct 27, 2026. paid standard per 1M tokens through 2026-11-30; $4.00 from 2026-12-01; page last updated 2026-10-27 UTC

Claude Opus 5.5: source Vendor pricing page, as of Oct 27, 2026. Claude API base input USD per 1M tokens; also stated on the Opus 5.5 model overview excerpts

Output price

Lower is better

Gemini 4 Argon $10

Claude Opus 5.5 $20

Gemini 4 Argon: source Vendor pricing page, as of Oct 27, 2026. paid standard including thinking tokens through 2026-11-30; $20.00 from 2026-12-01

Claude Opus 5.5: source Vendor pricing page, as of Oct 27, 2026. Claude API base output USD per 1M tokens

Context window

Higher is better

Gemini 4 Argon 1.05M tokens

Claude Opus 5.5 1M tokens

Gemini 4 Argon: source Vendor model page, as of Oct 14, 2026. unified input and output token limit; page last updated 2026-10-14 UTC

Claude Opus 5.5: source Vendor model page, as of Oct 27, 2026. 1M tokens on the Claude models comparison table

Output speed

Higher is better

Gemini 4 Argon 80.9 tok/s

Claude Opus 5.5 98.3 tok/s

Gemini 4 Argon: source Artificial Analysis, as of Oct 27, 2026. high; Google API; AA model-page output speed

Claude Opus 5.5: source Artificial Analysis, as of Oct 27, 2026. max, default fallback; Anthropic API

Time to first token

Lower is better

For reasoning settings, Artificial Analysis counts thinking time before the first answer token, so long waits are expected on max effort modes.

Gemini 4 Argon 48.23 s

Claude Opus 5.5 741.38 s

Gemini 4 Argon: source Artificial Analysis, as of Oct 27, 2026. high; Google API; AA FAQ label is TTFT; on reasoning models AA sets that equal to time to first answer, so thinking is included

Claude Opus 5.5: source Artificial Analysis, as of Oct 27, 2026. max, default fallback; AA FAQ TTFT; comparison table sets Time to First Token equal to Time to First Answer Token, so thinking is included

Artificial Analysis Intelligence Index

Higher is better

Composite of several evaluations run by Artificial Analysis at the setting shown.

Gemini 4 Argon 53 points

Claude Opus 5.5 58 points

Gemini 4 Argon: source Artificial Analysis, as of Oct 27, 2026. high reasoning; AA Intelligence Index v4.3.2 integer shown on the model page

Claude Opus 5.5: source Artificial Analysis, as of Oct 27, 2026. max effort, default fallback; AA index integer on the model page

LMArena Text score

Higher is better

Bars start at 1300, not 0, to make differences easier to see.

Gemini 4 Argon 1526

Claude Opus 5.5 1516

Gemini 4 Argon: source LMArena Text, as of Oct 22, 2026. Reported for Gemini 4 Argon (High).

Claude Opus 5.5: source LMArena Text, as of Oct 22, 2026. Reported for Claude Opus 5.5 (High).

LMArena WebDev score

Higher is better

Bars start at 1300, not 0, to make differences easier to see.

Gemini 4 Argon 1674

Claude Opus 5.5 1807

Gemini 4 Argon: source LMArena WebDev, as of Oct 23, 2026. Reported for Gemini 4 Argon (High).

Claude Opus 5.5: source LMArena WebDev, as of Oct 23, 2026. Reported for Claude Opus 5.5 (Max).

Humanity's Last Exam (no tools)

Higher is better

Gemini 4 Argon Not published

Claude Opus 5.5 61.4%

Claude Opus 5.5: source Artificial Analysis, as of Oct 27, 2026. max with fallback; AA HLE, tool usage marked off in the Intelligence Index methodology, 2158 text questions, pass@1

All metrics

Metric	Gemini 4 Argon	Claude Opus 5.5
Input price	$2.00as of Oct 27, 2026	$4.00as of Oct 27, 2026
Output price	$10as of Oct 27, 2026	$20as of Oct 27, 2026
Context window	1.05M tokensas of Oct 14, 2026	1M tokensas of Oct 27, 2026
Output speed	80.9 tok/sas of Oct 27, 2026	98.3 tok/sas of Oct 27, 2026
Time to first token	48.23 sas of Oct 27, 2026	741.38 sas of Oct 27, 2026
Artificial Analysis Intelligence Index	53 pointsas of Oct 27, 2026	58 pointsas of Oct 27, 2026
LMArena Text score	1526as of Oct 22, 2026	1516as of Oct 22, 2026
LMArena WebDev score	1674as of Oct 23, 2026	1807as of Oct 23, 2026
Humanity's Last Exam (no tools)	Not published	61.4%as of Oct 27, 2026

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