GPT-5.5 Instant

Closed Source

Closed Weights

Parameters

Undisclosed

Context Length

Modality

Multimodal

Architecture

Undisclosed

License

Proprietary

Release Date

5 May 2026

Knowledge Cutoff

API Pricing (per 1M)

Input: $5.00 · Output: $30.00

Evaluation Benchmarks

Rank

#75

Benchmark	Score	Rank
General Text Text Arena	1473	37
Graduate-Level QA GPQA	0.856	43
Agentic Index Artificial Analysis	0.17	91
Coding Index Artificial Analysis	0.39	108
Intelligence Index Artificial Analysis	0.26	116

Rankings

Overall Rank

#75

Coding Rank

#97

About 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.

Technical Specifications

Architecture specifications are undisclosed for proprietary models.

Resources

Official Documentation

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