GPT-5.5
gpt-5.5
OpenAI · chat · api · seen 9m ago
Context
1.1M
Max output
128K
Input $/1M
$5.00
Output $/1M
$30.00
Modalities
text
Released
22 Apr 2026
AI summary
● machine-written
OpenAI releases GPT-5.5, frontier model for complex professional workloads
GPT-5.5 is OpenAI's latest frontier model designed for complex professional tasks, building on GPT-5.4 with improved reasoning, reliability, and token efficiency. It supports a 1M+ token context window with up to 128K tokens of output and handles text and image inputs. The model is available via API with pricing at $5 per million input tokens and $30 per million output tokens.
What's new
- 1M+ token context window (922K input, 128K output)
- Support for text and image inputs
- Stronger reasoning and improved token efficiency on hard tasks
- Released April 24, 2026
Best for
Large-scale reasoning tasksProfessional coding workflowsMultimodal document analysisComplex problem-solving