GPT-5.3 Chat vs o3-deep-research
GPT-5.3 Chat is cheaper on output tokens, while o3-deep-research offers a larger context window. Choose GPT-5.3 Chat or o3-deep-research based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | GPT-5.3 Chat | o3-deep-research |
|---|---|---|
| Provider | Vercel AI Gateway | Vercel AI Gateway |
| Input / 1M tokens | $1.75 | $10.00 |
| Output / 1M tokens | $14.00 | $40.00 |
| Context window | 128K | 200K |
| Parameters | — | — |
| Open weights | No | No |
| Released | Mar 2026 | Jun 2025 |
FAQ
Is GPT-5.3 Chat or o3-deep-research cheaper?
GPT-5.3 Chat is cheaper on output tokens ($14.00 vs $40.00 per 1M).
Which has the larger context window, GPT-5.3 Chat or o3-deep-research?
o3-deep-research has the larger context window (200K tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.