GPT-5.6 Outpaces Claude Code and OpenCode in Speed and Cost Benchmark

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A benchmarking study published on tamiz.pro tested GPT-5.6, Claude Code, and OpenCode across 100,000-plus production-level code generation requests on AWS hardware. GPT-5.6 recorded the highest throughput at 1,820 tokens per second and the lowest latency at 115ms, outpacing OpenCode by 2.2x in speed. On cost, GPT-5.6 came in at $21.50 per million tokens, undercutting Claude Code by roughly 21%, though OpenCode remained the cheapest option at $19.30. GPT-5.6's performance gains were attributed to a sparse attention mechanism, 8-bit quantized weights, and larger batch processing without latency trade-offs. The study concluded that the best model depends on workload needs, with GPT-5.6 suited for speed-critical tasks, OpenCode for budget-sensitive projects, and Claude Code for balanced, high-accuracy use cases.

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