Gemini 4 Argon vs GPT-6 Astra
| Benchmark | Gemini 4 Argon | GPT-6 Astra |
|---|---|---|
| Humanity's Last Exam | 57.1 | 52.7 |
| Terminal-Bench 4.0 | 57.1 | 49.5 |
| AutomationBench-AA | 77.5 | 64.6 |
| MMMU-Pro (vision) | — | 85.1 |
Specs
| Spec | Gemini 4 Argon | GPT-6 Astra |
|---|---|---|
| Input, per 1M | !$2 | $10 |
| Output, per 1M | !$10 | $50 |
| Cost per task? | $1.62 | $1.54 |
| Speed, tok/s | 79 | 59 |
| Context | 1M | 1.05M |
| Weights | Closed | Closed |
| Released | Oct 2026 | Sep 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
Gemini 4 Argon → GPT-6 Astra
Monitoring can return HTTP 403›
Misalignment monitoring can return HTTP 403 before streaming or errors after output; match misalignment_policy_violation and handle stream errors.
No none reasoning effort›
The none reasoning effort is unsupported on GPT-6 Astra and GPT-6.1 Sol; use low instead.
Remove unsupported sampling parameters›
When reasoning effort is not none, remove temperature, top_p and top_logprobs, plus Chat Completions logprobs or Responses output logprobs inclusion.
GPT-6 Astra → Gemini 4 Argon
Context: 1.05M → 1M
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.