OpenAI: GPT-5.5 Pro vs OpenAI: o4 Mini Deep Research
Side-by-side comparison. Updated 2026-06-07.
Verdict
OpenAI: GPT-5.5 Pro wins on higher overall score (9.5 vs 8.4, +1.1).
- Larger context window (1050k vs 200k)
At a Glance
| Attribute | OpenAI: GPT-5.5 Pro | OpenAI: o4 Mini Deep Research |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Tags | Intelligent Reasoning Coding Agentic Long Context | Reasoning Fast |
| Context | 1,050,000 tokens | 200,000 tokens |
| Input price | $30.00/1M | $2.00/1M |
| Output price | $8.00/1M | $8.00/1M |
| Input modalities | File, Image, Text | File, Image, Text |
| Output modalities | Text | Text |
OpenAI: GPT-5.5 Pro Strengths
- Unmatched deep reasoning for complex high-stakes workloads
- 1M+ token context window with image input support
- Excels at long-horizon agents and multi-step coding
- Precise execution across agentic workflows
OpenAI: o4 Mini Deep Research Strengths
- Cost-effective deep research capability
- Faster than o3 Deep Research
- Strong structured output quality
- Good multi-step reasoning