GPT-5.5 vs GPT-5.3
Side-by-side comparison. Updated 2026-07-01.
Summary
Compare GPT-5.5 and GPT-5.3 across pricing, context window, modalities, strengths, weaknesses, and best-fit workloads.
Use the details below to weigh cost, context, modalities, and workload fit.
At a Glance
| Attribute | GPT-5.5 | GPT-5.3 |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Tags | Intelligent Reasoning Multimodal | Intelligent Reasoning Coding Multimodal |
| Context | 128,000 tokens | 400,000 tokens |
| Input price | $12.50/1M | $11.00/1M |
| Output price | $50.00/1M | $44.00/1M |
| Input modalities | Text | Text, Image, 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
GPT-5.3 Strengths
- Improved agentic coding
- Reliable multi-step tool use
- 400K context window
- File and image input