| Output $/MTok | $4.40 | $4.50 |
|---|---|---|
| Input $/MTok | $1.10 | $0.75 |
| Cached input $/MTok | $0.2750 | $0.0750 |
| Context window | 200,000 | 400,000 |
| Output cap | 100,000 | 128,000 |
| Modalities | in: text, image / out: text | in: text, image / out: text |
| Tool use | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Family | o-series | GPT-5.4 |
| Knowledge cutoff | 2024-06-01 | 2025-08-31 |
| Verified | 2026-07-02 | 2026-07-02 |
| Source | provider page ↗ | provider page ↗ |
| $/min | $0.002150 |
|---|---|
| $/min batch | — |
| Streaming | ✓ |
| Realtime | ✓ |
| Languages | 56+ |
| Diarization | included |
| TTFW | — |
| Verified | 2026-07-02 |
| Source | provider page ↗ |
| $/1M chars | $50.00 | $30.00 | $50.00 |
|---|---|---|---|
| Voice quality | neural | neural | neural |
| Voice cloning | ✓ included | — | ✓ included |
| Voice count | — | 94 | — |
| Languages | en, fr, de, es, pt, zh, ja, ko | en | 31+ |
| SSML support | — | — | — |
| TTFB | 90ms | 37ms | — |
| Output formats | — | — | — |
| Verified | 2026-07-02 | 2026-07-02 | 2026-07-02 |
| Source | provider page ↗ | provider page ↗ | provider page ↗ |