GPT-5.5 vs OpenAI: o3 Deep Research
Side-by-side comparison. Updated 2026-06-07.
Verdict
GPT-5.5 wins on higher overall score (9.4 vs 9.0, +0.4).
Both models score equally. Pick based on which strengths align with your workload.
At a Glance
| Attribute | GPT-5.5 | OpenAI: o3 Deep Research |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Tags | general | Reasoning Agentic Intelligent |
| Context | 128,000 tokens | 200,000 tokens |
| Input price | $12.50/1M | $10.00/1M |
| Output price | $40.00/1M | $40.00/1M |
| Input modalities | Text | Image, Text, File |
| Output modalities | Text | Text |
GPT-5.5 Strengths
- Strong general knowledge
- Deep reasoning chain-of-thought
- Reliable structured output
- Broad tool-use capability
- Excellent multilingual support
OpenAI: o3 Deep Research Strengths
- Best-in-class multi-step research and synthesis
- Thorough source evaluation and cross-referencing
- Handles ambiguous open-ended questions well
- Produces cited, well-structured research reports