GPT-5.4 Mini vs GPT-5.6 Terra
| Benchmark | GPT-5.4 Mini | GPT-5.6 Terra |
|---|---|---|
| Humanity's Last Exam | 18.6 | 33.3 |
| Terminal-Bench 4.0 | 2 · xhigh | 1 |
| AutomationBench-AA | 26.2 · xhigh | 33.5 |
| Arena Text · creative writing | 1,402 · high | 1,429 · xhigh |
| MMMU-Pro (vision) | 71.2 | 76.8 |
Specs
| Spec | GPT-5.4 Mini | GPT-5.6 Terra |
|---|---|---|
| Input, per 1M | $0.75 | $2 |
| Output, per 1M | $4.50 | $12 |
| Cost per task? | — | $0.18 |
| Speed, tok/s | 247 | 125 |
| Context | 400K | 1.05M |
| Weights | Closed | Closed |
| Released | Mar 2026 | Jul 2026 |
| See images | ✓ | ✓ |
| Read PDFs | Partial | 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
GPT-5.4 Mini → GPT-5.6 Terra
Prompts with >272K input tokens›
Above 272K input tokens, input costs 2× and output 1.5× for the full request.
GPT-5.6 Terra → GPT-5.4 Mini