Overview
GPT-5.5
Author
OpenAIGPT-5
Author
OpenAIGPT-5.5
Context length
1.05MtokensGPT-5
Context length
400KtokensGPT-5.5
Reasoning
GPT-5
Reasoning
GPT-5.5
Input modalities
GPT-5
Input modalities
GPT-5.5
Output modalities
GPT-5
Output modalities
Compare GPT-5.5 from OpenAI and GPT-5 from OpenAI on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the OpenRouter API.
GPT-5.5 and GPT-5 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
GPT-5.5, from OpenAI, has a 1,050,000-token context window and is priced at $5/M tokens input, $30/M tokens output on OpenRouter.
GPT-5, from OpenAI, has a 400,000-token context window and is priced at $1.25/M tokens input, $10/M tokens output on OpenRouter.
| GPT-5.5 | GPT-5 | |
|---|---|---|
| Input price | $5/M tokens | $1.25/M tokens |
| Output price | $30/M tokens | $10/M tokens |
| Context window | 1,050,000 tokens | 400,000 tokens |
| Intelligence Index | 38.4 | 22.9 |
| Coding Index | 74.9 | Not available |
| Agentic Index | 36.4 | Not available |
| Latency (p50) | 6.48 s | 8.59 s |
| Throughput (p50) | 64.0 tok/s | 85.0 tok/s |
GPT-5.5 has the longer context window at 1,050,000 tokens, compared with 400,000 tokens for GPT-5.
GPT-5 is faster on OpenRouter, generating a median 85.0 tokens per second compared with 64.0 tokens per second for GPT-5.5.