Claude Opus 5 vs Gemini 4 Argon
Different efforts: medium · high · Compare all at high
Arena Text · creative writing Arena Text · creative writing: Human pairwise preferences in the stated text vote pool
Opus 5 · max1,471
Gemini 4 Argon1,516
Lech Mazur Short-Story Lech Mazur Short-Story · comparison score: Judges compare stories written to ten required elements; the comparison score can be negative
Opus 5 · xhigh3.7
Gemini 4 Argon0.8
EQ-Bench Longform Creative Writing 1.11 Longform Creative Writing 1.11: Models plan, revise and write a story across eight turns, graded with a writing rubric
Opus 586.3
Gemini 4 Argon—
EQ-Bench Creative Writing v3 Creative Writing v3 · Elo: Judge-rated creative writing under the v3 prompt set and pairwise ranking
Opus 52,132.6
Gemini 4 Argon—
Harvey LAB-AA 1.1 Harvey LAB-AA 1.1: Legal agents work from case documents; every rubric criterion must pass and material hallucinations receive no credit
Opus 5—
Gemini 4 Argon3.9
| Benchmark | Opus 5 | Gemini 4 Argon |
|---|---|---|
| Arena Text · creative writing | 1,471 · max | 1,516 |
| Lech Mazur Short-Story | 3.7 · xhigh | 0.8 |
| EQ-Bench Longform Creative Writing 1.11 | 86.3 | — |
| EQ-Bench Creative Writing v3 | 2,132.6 | — |
| Harvey LAB-AA 1.1 | — | 3.9 |
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.