Intelligence Index
0137.3
> 84% OF MODELS
OpenAI
Chatgpt 5.5
Updated: September 2026
GPT-5.5 is OpenAI's frontier model for complex professional workloads with stronger reasoning and reliability than 5.4. It supports text and image inputs with a 1M context window for long-horizon reasoning and coding.
Specifications
- Context
- 1M
- Input Modalities
- Image, Text, File
- Output Modalities
- Text
- Input
- $5/M
- Output
- $30/M
Capabilities
VISIONTHINKINGCODINGWRITING
Similarly Priced Models
| Model | Provider | Context | Input Price | Output Price |
|---|---|---|---|---|
| GPT-6 Astra (batch) | OpenAI | 1M | $5/M | $25/M |
| GPT-6 Astra Pro (batch) | OpenAI | 1M | $5/M | $25/M |
| Claude Fable 5.1 (batch) | Anthropic | 1M | $5/M | $25/M |
| Claude Opus 5 | Anthropic | 1M | $5/M | $25/M |
| Claude Opus 5 | Anthropic | 1M | $5/M | $25/M |
Performance Metrics
Coding Index
0271.6
> 84% OF MODELS
Agentic Index
0335.4
> 69% OF MODELS
Average Response Performance
- Output Speed
- 80.5 tok/s
- Time To First Token
- 10.37s
- Time To First Answer Token
- 10.37s
- End To End Response Time
- 16.58s
DATA SOURCE: Artificial Analysis