Claude Opus 5 vs Gemini 4 Argon
Different efforts: medium · high · Compare all at high
Humanity's Last Exam Humanity's Last Exam: Very hard expert questions across many fields, written to stump today’s models
Opus 551.3
Gemini 4 Argon57.1
Terminal-Bench 4.0 Terminal-Bench 4.0 · source setting 2: Agents use a terminal to complete executable coding, system administration and research tasks in the 4.0 suite
Opus 534.3
Gemini 4 Argon57.1
AutomationBench-AA AutomationBench-AA: Agents orchestrate SaaS workflows through APIs; objectives receive credit only when the task has no guardrail violation
Opus 554.3
Gemini 4 Argon77.5
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
MMMU-Pro (vision) MMMU-Pro (vision): College-level questions that require understanding images: charts, diagrams, photos
Opus 581.6
Gemini 4 Argon—
| Benchmark | Opus 5 | Gemini 4 Argon |
|---|---|---|
| Humanity's Last Exam | 51.3 | 57.1 |
| Terminal-Bench 4.0 | 34.3 | 57.1 |
| AutomationBench-AA | 54.3 | 77.5 |
| Arena Text · creative writing | 1,471 · max | 1,516 |
| MMMU-Pro (vision) | 81.6 | — |
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.