Overview
Claude Opus 4.5 vs GPT-5.1-Codex-Max: side-by-side summary
Claude Opus 4.5 and GPT-5.1-Codex-Max are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Claude Opus 4.5, from Anthropic, has a 200,000-token context window and is priced at $5/M tokens input, $25/M tokens output on OpenRouter.
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.
- Context window
- Claude Opus 4.5: 200,000 tokens
- GPT-5.1-Codex-Max: 400,000 tokens
- Price
- Claude Opus 4.5: $5/M tokens input, $25/M tokens output
- GPT-5.1-Codex-Max: $1.25/M tokens input, $10/M tokens output
- Provided by
- Claude Opus 4.5: Anthropic
- GPT-5.1-Codex-Max: OpenAI