OpenAI
GPT-5.5
OpenAI's GPT-5.5 launched in ChatGPT and Codex on April 23, 2026, with API access announced April 24. It remains listed in the API as a prior-generation model with text and image input, text output, a 1.05M-token context window and up to 128K output. Standard API rates are $5/$30 per MTok (input/output), with $0.50 cached input; sessions exceeding 272K input tokens use 2x input and 1.5x output rates.
1M tokens
Multimodal
Max
Superseded
- Provider
- OpenAI
- Context
- 1MCatalog · As of Aug 11, 2026Stale · 31d old
- yno subscription tier
- Max
- Released
- Apr 23, 2026
- Speed
- Medium
- Reasoning
- Expert
- Modality
- Multimodal
Benchmarks
Quality
- AA Intelligence Index
- AA Coding Index
- GPQA Diamond
- 93.5%Artificial Analysis · Date unknownAge unknown
Speed and latency
- Output speed
API pricing
- API input cost
- API output cost
Benchmark variant: GPT-5.5 (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
- Text Generation
- Vision
- Code
- Agentic
- Computer Use
- Tool Use
Use cases
- Autonomous research
- Multi-step coding
- Spreadsheet automation
- Long-context analysis
Strengths
- 1.05M context / 128K output
- Text and image input
- Adjustable reasoning effort
- Tool use and coding
Best for
Teams running long-horizon agentic workflows with messy multi-part inputs
Use GPT-5.5 in yno.ai
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Related models
Frequently asked
- What is GPT-5.5?
- OpenAI's GPT-5.5 launched in ChatGPT and Codex on April 23, 2026, with API access announced April 24. It remains listed in the API as a prior-generation model with text and image input, text output, a 1.05M-token context window and up to 128K output. Standard API rates are $5/$30 per MTok (input/output), with $0.50 cached input; sessions exceeding 272K input tokens use 2x input and 1.5x output rates.
- How much does GPT-5.5 cost in yno.ai?
- GPT-5.5 is available on the Max tier of yno.ai.
- What can GPT-5.5 do?
- GPT-5.5 is best for Teams running long-horizon agentic workflows with messy multi-part inputs. Its main capabilities include Text Generation, Vision, Code, Agentic, Computer Use, Tool Use.
- How does GPT-5.5 compare to other models?
- GPT-5.5 excels at 1.05M context / 128K output and is recommended for Autonomous research, Multi-step coding, Spreadsheet automation, Long-context analysis. See related models below.
- How do I use GPT-5.5 in yno.ai?
- Sign up for yno.ai, select GPT-5.5 from the model picker, and start chatting.