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The fastest way to evaluate SERV Reasoning. Pick any two models, run the same prompt through both — one in Raw mode, one with SERV Reasoning — and read the diff. Takes about a minute, no SDK setup.
SERV Reasoning Playground: side-by-side comparison of GPT-5.5 in Raw mode and GPT-5.4 Nano with SERV Reasoning on the same prompt, with token, cost, and latency metrics underneath.

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What you can do

  • Compare models side by side. Run the same prompt through any two models — one with SERV Reasoning, one without.
  • See cost, tokens, and latency. Each side shows real metrics for the response.
  • Iterate on your system prompt. Edit it at the top and rerun before baking anything in.
  • Bring your own prompts. Start from the samples, then paste in your real workload.

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A useful first test

Pin a larger model in Raw mode against a smaller one with SERV Reasoning. If outputs match on your real prompts, the smaller model is your production choice. console.openserv.ai/playground