Claude Opus 5 vs Gemini 4 Argon
Different efforts: medium · high · Compare all at high
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
WebDev Arena WebDev Arena: Human pairwise preferences in the stated webdev vote pool
Opus 5 · max1,689
Gemini 4 Argon1,678
SWE-bench Pro (v2 full) SWE-bench Pro (v2 full): Agents resolve repository issues under the network-locked v2 protocol; full and 51-task Hard results are separate
Opus 5 · xhigh99.4
Gemini 4 Argon99.2
SWE-bench Pro (v2 hard) SWE-bench Pro (v2 hard): Agents resolve repository issues under the network-locked v2 protocol; full and 51-task Hard results are separate
Opus 5 · xhigh98
Gemini 4 Argon92.2
SciCode SciCode: Writing code for real scientific computing problems (physics, biology, math)
Opus 551.5
Gemini 4 Argon61.8
Terminal-Bench Science 0.1 Terminal-Bench Science 0.1: Agents complete expert-authored research workflows across five scientific domains in a terminal
Opus 5 · max28.6
Gemini 4 Argon52.9
DeepSWE 1.1 DeepSWE 1.1: Agents change repository code to resolve software engineering tasks under the stated DeepSWE edition
Opus 568.9
Gemini 4 Argon—
FrontierCode 1.1 FrontierCode 1.1: Agents implement changes in real repositories, graded against maintainer-defined requirements
Opus 5—
Gemini 4 Argon43.5
| Benchmark | Opus 5 | Gemini 4 Argon |
|---|---|---|
| Terminal-Bench 4.0 | 34.3 | 57.1 |
| WebDev Arena | 1,689 · max | 1,678 |
| SWE-bench Pro (v2 full) | 99.4 · xhigh | 99.2 |
| SWE-bench Pro (v2 hard) | 98 · xhigh | 92.2 |
| SciCode | 51.5 | 61.8 |
| Terminal-Bench Science 0.1 | 28.6 · max | 52.9 |
| DeepSWE 1.1 | 68.9 | — |
| FrontierCode 1.1 | — | 43.5 |
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.