Claude Opus 5 vs Gemini 4 Argon

$2.19 / task

Wins 0 of 5 benchmarks

$1.99 / task

Wins 2 of 5 benchmarks

Different efforts: medium · high · Compare all at high

Only shared

MMMU-Pro (vision) MMMU-Pro (vision): College-level questions that require understanding images: charts, diagrams, photos

Opus 581.6

Gemini 4 Argon—

Chartography Chartography: Expert chart reasoning over professional scientific, medical, financial and engineering charts

Opus 5 · max27.3

Gemini 4 Argon71.6

GDP.pdf · AA all-pass GDP.pdf · AA all-pass: Models reason over professional PDF documents; an attempt passes only when every atomic criterion passes

Opus 520

Gemini 4 Argon21.8

Arena Document · overall Arena Document · overall: Human pairwise preferences in the stated document vote pool

Opus 5 · high1,516.3

Gemini 4 Argon—

Arena Vision · overall Arena Vision · overall: Human pairwise preferences in the stated vision vote pool

Opus 5 · high1,319.6

Gemini 4 Argon—

Benchmark	Opus 5	Gemini 4 Argon
MMMU-Pro (vision)	81.6	—
Chartography	27.3 · max	71.6
GDP.pdf · AA all-pass	20	21.8
Arena Document · overall	1,516.3 · high	—
Arena Vision · overall	1,319.6 · high	—

Specs

Spec	Opus 5	Gemini 4 Argon
Input, per 1M	$5	!$2
Output, per 1M	$25	!$10
Cost per task?	$2.19	$1.99
Speed, tok/s	55	84
Context	1M	1M
Weights	Closed	Closed
Released	Jul 2026	Oct 2026
See images	✓	✓
Read PDFs	Partial	✓
Hear audio	—	✓
Watch video	—	✓
Call tools	✓	✓
Force a tool call	Partial	Partial
Return strict JSON	✓	✓
Search the web	?	✓
Run code	?	✓
Use a computer	?	?

What breaks when you switch

Opus 5 → Gemini 4 Argon

Synchronous output stops at 65,536›

With background false, output limits above 65,536 tokens return HTTP 400; stay at or below that limit.

Sampling parameters are ignored›

temperature, top_p and top_k are ignored; remove them from requests.

No explicit caching›

Explicit caching is unavailable; omit explicit cache requests.

Gemini 4 Argon → Opus 5

Nothing known.