Claude Jupiter v1-p vs GPT-5.5 Benchmark: Real API Test on Reasoning and Coding

Claude Jupiter v1-p vs GPT-5.5: Real API Benchmark for Reasoning and Coding claude-jupiter-v1-p is an interesting model ID because it looks like a test or pre-release Claude route, while gpt-5.5 is the current high-end GPT route available through Crazyrouter. Instead of guessing from the names, I ran both models through the same benchmark using the China endpoint: Base URL: - claude-jupiter-v1-p - gpt-5.5 Date: 2026-05-27 The goal was not to create a massive academic benchmark.