| Output $/MTok | $1.25 | $60.00 |
|---|---|---|
| Input $/MTok | $0.20 | $15.00 |
| Cached input $/MTok | $0.0200 | $7.5000 |
| Context window | 400,000 | 200,000 |
| Output cap | 128,000 | 100,000 |
| Modalities | in: text, image / out: text | in: text, image / out: text |
| Tool use | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Family | GPT-5.4 | o-series |
| Knowledge cutoff | 2025-08-31 | 2023-10-01 |
| Verified | 2026-07-19 | 2026-07-19 |
| Source | provider page ↗ | provider page ↗ |
| $/1M chars | $50.00 | $17.50 | $30.00 | — |
|---|---|---|---|---|
| Voice quality | neural | neural | neural | neural |
| Voice cloning | ✓ included | ✓ included | — | ✓ included |
| Voice count | — | 217 | 94 | — |
| Languages | en, fr, de, es, pt, zh, ja, hi, ko | en, hi, es, mr, kn, ta, bn, gu, te, ml, pa, or | en | en |
| SSML support | — | — | — | — |
| TTFB | 40ms | 200ms | 37ms | — |
| Output formats | — | pcm, mp3, wav, ulaw, alaw | — | — |
| Verified | 2026-07-19 | 2026-07-19 | 2026-07-19 | 2026-07-19 |
| Source | provider page ↗ | provider page ↗ | provider page ↗ | provider page ↗ |