GPT-5 Codex vs R1T Chimera: side-by-side summary

GPT-5 Codex and R1T Chimera 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.

R1T Chimera, from tngtech, has a 163,840-token context window and is priced by the provider serving it on OpenRouter.

Context window

• GPT-5 Codex: 400,000 tokens
• R1T Chimera: 163,840 tokens

Price

• GPT-5 Codex: Pricing varies by provider
• R1T Chimera: Pricing varies by provider

Provided by

• GPT-5 Codex: OpenAI
• R1T Chimera: tngtech

• GPT-5 Codex model details, providers and pricing
• R1T Chimera model details, providers and pricing