Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | KAT Coder Pro V2 | GPT-5.6 Luna (low) |
|---|---|---|
| Input ($/M tokens) | $0.3 | $0.2 |
| Output ($/M tokens) | $1.2 | $1.2 |
Verdict. KAT Coder Pro V2 and GPT-5.6 Luna (low) split the benchmark comparison evenly at 1–1. The tiebreaker here is price, speed, and what you actually run them on.
Pricing. Both models sit in the budget bracket for output-token pricing. At 1.0× the per-million-token cost, GPT-5.6 Luna (low) is meaningfully cheaper if your traffic is output-heavy (long completions, document generation, agent loops). GPT-5.6 Luna (low) makes more sense when output volume is low and absolute reasoning quality justifies the premium.
Strengths. KAT Coder Pro V2 is strongest on Coding Index (59.5), Intelligence Index (33.7). GPT-5.6 Luna (low) leads on Coding Index (44.2), Intelligence Index (33.9).
Speed. On throughput, GPT-5.6 Luna (low) generates tokens at 138 tok/s versus 107 tok/s — about 22% faster. On time-to-first-token, KAT Coder Pro V2 responds in 1380ms vs 1740ms, which matters most for chat-style UIs.
Provider. KwaiKAT and OpenAI sell to overlapping but distinct developer audiences: KwaiKAT tends to ship frontier reasoning models with premium positioning, while OpenAI often prices more aggressively. Your existing vendor relationships, billing, and SLA preferences may matter as much as the raw numbers above.
Workload cost. Workload scenarios (per million requests at 30M input + 15M output tokens): KAT Coder Pro V2 costs $27.00 ($324/year); GPT-5.6 Luna (low) costs $24.00 ($288/year). At a smaller 5M-input/2M-output scale (single-developer tool or prototype): KAT Coder Pro V2 ≈ $3.90/run, GPT-5.6 Luna (low) ≈ $3.40/run. At agent/realtime scale (200M input / 100M output per million requests): KAT Coder Pro V2 ≈ $180/run, GPT-5.6 Luna (low) ≈ $160/run. GPT-5.6 Luna (low) becomes more attractive at higher volume — the absolute per-token pricing difference compounds when you ship at scale.
Recommendation. Both models have legitimate use cases — the right answer depends on whether you are optimizing for benchmark ceiling, latency, or unit cost. Start with the cheaper / faster model, evaluate against your specific task, and only switch if the upgrade shows a meaningful lift.
Head-to-head deltas
Data from Artificial Analysis API — 12 benchmarks
GPT-5.6 Luna (low) is cheaper overall. Its blended price (3:1 input/output ratio) is $0.45/M tokens vs $0.53/M for KAT Coder Pro V2.
It's a tie — both models win 1 benchmarks each across 12 evaluated categories. See the detailed benchmark chart above for per-category results.
GPT-5.6 Luna (low) generates tokens faster at 138 tok/s vs 107 tok/s. KAT Coder Pro V2 also has lower time-to-first-token (1.38s vs 1.74s).
Choose based on your priorities: GPT-5.6 Luna (low) for lower cost, both perform similarly on benchmarks, and GPT-5.6 Luna (low) for faster generation. For latency-sensitive apps, check the TTFT comparison above.