GPT-5.5 vs OpenAI: o4 Mini Deep Research
Side-by-side comparison. Updated 2026-06-07.
Verdict
GPT-5.5 wins on higher overall score (9.4 vs 8.4, +1.0).
Both models score equally. Pick based on which strengths align with your workload.
At a Glance
| Attribute | GPT-5.5 | OpenAI: o4 Mini Deep Research |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Tags | general | Reasoning Fast |
| Context | 128,000 tokens | 200,000 tokens |
| Input price | $12.50/1M | $2.00/1M |
| Output price | $8.00/1M | $8.00/1M |
| Input modalities | Text | File, Image, Text |
| 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: o4 Mini Deep Research Strengths
- Cost-effective deep research capability
- Faster than o3 Deep Research
- Strong structured output quality
- Good multi-step reasoning