GPT-5.5 Instant
Parameters
-
Context Length
1,000K
Modality
Multimodal
Architecture
Dense
License
Proprietary
Release Date
5 May 2026
Knowledge Cutoff
-
Technical Specifications
Attention
Attention Structure
Multi-Head Attention
Attention Heads
-
Key-Value Heads
-
Attention Head Dimension
-
Position Embedding
Absolute Position Embedding
RoPE Theta
-
Sliding Window Attention
-
Sliding Window Size
-
Normalization
-
Activation Function
-
Dimensions
Hidden Dimension Size
-
Number of Layers
-
FFN Intermediate Size (Dense)
-
Multi-Token Prediction Heads
-
Tokenizer
Vocabulary Size
-
GPT-5.5 Instant
OpenAI's fast daily driver model released May 5, 2026. Features a 1,000,000 token context window, advanced memory source citation mechanics, and tight concise text generations with a massive 52.5% reduction in hallucination profiles. Handled natively in the API via the "chat-latest" alias.
About GPT-5.5 Instant
GPT-5.5 Instant is OpenAI's high-speed, cost-efficient default model tier launched globally for ChatGPT and developers. Engineered to dramatically reduce latency and cut hallucinations by over 50% in high-stakes fields like medicine and law, it uses roughly 30% fewer words per response than its predecessor line while supporting integrated memory sources and advanced tool calling.
Other GPT-5.5 Instant Models
- No related models available
Evaluation Benchmarks
Rank
#78
No evaluation benchmarks for GPT-5.5 Instant available.
Rankings
Overall Rank
#78
Coding Rank
-