Plain-English Summary
The prior GPT flagship. Still strong and widely deployed, but superseded by the 5.6 line.
GPT-5.5
The prior GPT flagship. Still strong and widely deployed, but superseded by the 5.6 line.
Maker
OpenAI
Text LLM
Previous gen
Open weights: No
Technical Notes
LLM Stats 44.6, coding arena ~2,115, 1.1M context. Quality tracker flagged a ~1.27 sigma dip over the last 30 days.
Best For
Existing integrations already built on it
Watch Out For
Reported quality drift; migrate to 5.6 when convenient
Model Specs
- Maker
- OpenAI
- Country
- USA
- Family
- Not listed
- Type
- Text LLM
- Release date
- 2026-05 (approx.)
- Date confidence
- Approximate
- Status
- Previous gen
- Context window
- 1.1M tokens
- Max output
- Not listed
- Parameters
- Not disclosed
- Active parameters
- Not disclosed
- Architecture
- Not listed
- Reasoning
- Not listed
- Tool calling
- Not listed
- Structured output
- Not listed
- API available
- Not listed
- Open weights
- No
- Self-hostable
- Not listed
- License
- Not listed
- Inputs
- Text, images
- Outputs
- Text
- Approx. price
- ~$7.78 blended
- How to access
- ChatGPT, OpenAI API
- Model / API ID
- Not listed
- Knowledge cutoff
- Not disclosed
- Fine-tuning
- Not listed
- Completeness
- Not listed
- Verified
- Not listed
- Snapshot date