OpenAI
GPT-5.5 Instant
OpenAI's May 5, 2026 ChatGPT conversation model, retained here as a historical variant after GPT-5.6 Luna became the Free default. In OpenAI's internal launch evaluation of high-stakes prompts, it produced 52.5% fewer hallucinated claims than GPT-5.3 Instant. Its original API access used the moving chat-latest alias, which no longer establishes a fixed GPT-5.5 Instant identity.
128K tokens
Multimodal
Pro
- Provider
- OpenAI
- Context
- 128KCatalog · As of Aug 11, 2026Stale · 31d old
- yno subscription tier
- Pro
- Released
- May 5, 2026
- Speed
- Fast
- Reasoning
- Advanced
- Modality
- Multimodal
Benchmarks
Quality
- AA Intelligence Index
- AA Coding Index
- GPQA Diamond
- 82.3%Artificial Analysis · Date unknownAge unknown
Speed and latency
- Output speed
- 140.9tokens/sConfiguration: Prompt length: 1,000 · Parallel queries: 1Artificial Analysis · Date unknownAge unknown
- Time to first token
- 0.99sConfiguration: Prompt length: 1,000 · Parallel queries: 1Artificial Analysis · Date unknownAge unknown
- Time to first answer token
- 15.18sConfiguration: Prompt length: 1,000 · Parallel queries: 1Artificial Analysis · Date unknownAge unknown
API pricing
- API input cost
- API output cost
Benchmark variant: GPT-5.5 Instant (June 2026)
AA data retrieved Sep 11, 2026 · Artificial Analysis
Indexes use points; evaluations use accuracy percentages. API measurements do not measure yno application performance. Methodology
Capabilities
- Text Generation
- Vision
- Code
- Tool Use
Use cases
- Historical conversation-model comparisons
- Migration planning
- ChatGPT behavior analysis
- Evaluation of conversation quality
Strengths
- Former ChatGPT default
- Lower hallucinations in an internal launch evaluation
- Conversational responses
- Text and image input
Best for
Historical comparisons and migration planning from GPT-5.5 Instant
Use GPT-5.5 Instant in yno.ai
No credit card required
Related models
Frequently asked
- What is GPT-5.5 Instant?
- OpenAI's May 5, 2026 ChatGPT conversation model, retained here as a historical variant after GPT-5.6 Luna became the Free default. In OpenAI's internal launch evaluation of high-stakes prompts, it produced 52.5% fewer hallucinated claims than GPT-5.3 Instant. Its original API access used the moving chat-latest alias, which no longer establishes a fixed GPT-5.5 Instant identity.
- How much does GPT-5.5 Instant cost in yno.ai?
- GPT-5.5 Instant is available on the Pro tier of yno.ai.
- What can GPT-5.5 Instant do?
- GPT-5.5 Instant is best for Historical comparisons and migration planning from GPT-5.5 Instant. Its main capabilities include Text Generation, Vision, Code, Tool Use.
- How does GPT-5.5 Instant compare to other models?
- GPT-5.5 Instant excels at Former ChatGPT default and is recommended for Historical conversation-model comparisons, Migration planning, ChatGPT behavior analysis, Evaluation of conversation quality. See related models below.
- How do I use GPT-5.5 Instant in yno.ai?
- Sign up for yno.ai, select GPT-5.5 Instant from the model picker, and start chatting.