GPT-5.5 vs OpenAI: gpt-oss-120b
Side-by-side comparison. Updated 2026-06-08.
Verdict
GPT-5.5 wins on higher overall score (9.4 vs 8.2, +1.2).
Both models score equally. Pick based on which strengths align with your workload.
At a Glance
| Attribute | GPT-5.5 | OpenAI: gpt-oss-120b |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Tags | general | Open Weight Intelligent |
| Context | 128,000 tokens | 131,072 tokens |
| Input price | $12.50/1M | $0.04/1M |
| Output price | $0.18/1M | $0.18/1M |
| Input modalities | Text | 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: gpt-oss-120b Strengths
- First open-weight release from OpenAI (Apache 2.0)
- Efficient 117B MoE architecture (5.1B active params)
- Strong reasoning and agentic capabilities
- Ultra-budget pricing for self-hosted deployment