LLMAPI only
GPT-5.5
OpenAI
Updated May 21, 2026 · Benchmarks via Artificial Analysis, specs & pricing via OpenRouter · Methodology · Report an error
Specifications
- Type
- LLM
- Access
- API only
- Released
- April 23, 2026
- License
- Proprietary
- Context window
- 1,050,000 tokens
- Knowledge cutoff
- December 1, 2025
- Output speed
- 67 tok/s
- Latency (TTFT)
- 0.97s
- Input
- Text, Image
- Output
- Text
- API pricing
- $5.00 in · $30.00 out / 1M tokens
Capabilities
Function callingStructured outputWeb search
Benchmarks
Reasoning
| GPQA Diamond | 93.5 |
Coding
| SWE-bench Pro | 58.6 |
General
| Terminal-Bench 2.0 | 82.7 |
| Humanity’s Last Exam | 44.3 |
Other
| Terminal-Bench 2.0 | 82.7 |
Our take
OpenAI’s coding- and agent-focused flagship with a notable price jump; pitched as more token-efficient despite the higher per-token rate.