Compare GPT-5.1-Codex-Max from OpenAI and Palmyra X5 from Writer on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the OpenRouter API.
GPT-5.1-Codex-Max and Palmyra X5 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
GPT-5.1-Codex-Max, from OpenAI, has a 400,000-token context window and is priced at $1.25/M tokens input, $10/M tokens output on OpenRouter.
Palmyra X5, from Writer, has a 1,040,000-token context window and is priced at $0.60/M tokens input, $6/M tokens output on OpenRouter.