Claude Opus 4.6 vs Gemini 4 Argon
Harvey LAB-AA 1.1?
Opus 4.6—
Gemini 4 Argon3.9
| Benchmark | Opus 4.6 | Gemini 4 Argon |
|---|---|---|
| Arena Text · creative writing | 1,500 | 1,516 |
| EQ-Bench Longform Creative Writing 1.11 | 77.7 | 80.9 |
| EQ-Bench Creative Writing v3 | 1,810.4 | 1,758 |
| Lech Mazur Short-Story | — | 0.7 |
| IFBench (instructions) | 44.6 | — |
| Harvey LAB-AA 1.1 | — | 3.9 |
Specs
| Spec | Opus 4.6 | Gemini 4 Argon |
|---|---|---|
| Input, per 1M | $5 | !$2 |
| Output, per 1M | $25 | !$10 |
| Cost per task? | — | $1.62 |
| Speed, tok/s | 43 | 79 |
| Context | 1M | 1M |
| Weights | Closed | Closed |
| Released | Feb 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 4.6 → 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 4.6
Nothing known.