Compare GPT-5 Codex from OpenAI and INTELLECT-3 from prime-intellect 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 Codex and INTELLECT-3 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
GPT-5 Codex, from OpenAI, has a 400,000-token context window and is priced by the provider serving it on OpenRouter.
INTELLECT-3, from prime-intellect, has a 131,072-token context window and is priced by the provider serving it on OpenRouter.
| GPT-5 Codex | INTELLECT-3 | |
|---|---|---|
| Input price | Pricing varies by provider | Pricing varies by provider |
| Output price | Pricing varies by provider | Pricing varies by provider |
| Context window | 400,000 tokens | 131,072 tokens |
| Intelligence Index | Not available | Not available |
| Coding Index | Not available | Not available |
| Agentic Index | Not available | Not available |
| Latency (p50) | Not available | Not available |
| Throughput (p50) | Not available | Not available |
GPT-5 Codex has the longer context window at 400,000 tokens, compared with 131,072 tokens for INTELLECT-3.