OpenAI
GPT-5.5 Pro
A GPT-5.5 reasoning variant that uses additional compute for complex questions. Supports medium, high and xhigh reasoning effort, text and image input, and text output. Available through the Responses API, including Batch requests, with a 1M-token context window and up to 128K output tokens. Some requests can take several minutes; background mode supports longer tasks.
1M tokens
Multimodal
Max
- Provider
- OpenAI
- Context
- 1MEstimated · As of Aug 11, 2026Stale · 31d old
- yno subscription tier
- Max
- Released
- Apr 23, 2026
- Speed
- Slow
- Reasoning
- Expert
- Modality
- Multimodal
Benchmarks
Quality
- AA Intelligence Index
- 57pointsEstimated · As of Aug 11, 2026Stale · 31d old
- GPQA Diamond
- 95%Estimated · As of Aug 11, 2026Stale · 31d old
Speed and latency
- Output speed
- 78tokens/sEstimated · As of Aug 11, 2026Stale · 31d old
API pricing
- API input cost
- API output cost
Benchmark variant: GPT-5.5 Pro (xhigh)
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
- Reasoning
- Code
- Research
- Agentic
Use cases
- Deep research
- Complex analysis
- Critical-path coding
- Scientific work
Strengths
- Additional reasoning compute
- Medium, high and xhigh effort
- Responses API and Batch
- 1.05M context / 128K output
Best for
Research and analysis teams using additional GPT-5.5 reasoning compute for complex questions
Use GPT-5.5 Pro in yno.ai
No credit card required
Related models
Frequently asked
- What is GPT-5.5 Pro?
- A GPT-5.5 reasoning variant that uses additional compute for complex questions. Supports medium, high and xhigh reasoning effort, text and image input, and text output. Available through the Responses API, including Batch requests, with a 1M-token context window and up to 128K output tokens. Some requests can take several minutes; background mode supports longer tasks.
- How much does GPT-5.5 Pro cost in yno.ai?
- GPT-5.5 Pro is available on the Max tier of yno.ai.
- What can GPT-5.5 Pro do?
- GPT-5.5 Pro is best for Research and analysis teams using additional GPT-5.5 reasoning compute for complex questions. Its main capabilities include Reasoning, Code, Research, Agentic.
- How does GPT-5.5 Pro compare to other models?
- GPT-5.5 Pro excels at Additional reasoning compute and is recommended for Deep research, Complex analysis, Critical-path coding, Scientific work. See related models below.
- How do I use GPT-5.5 Pro in yno.ai?
- Sign up for yno.ai, select GPT-5.5 Pro from the model picker, and start chatting.