Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | Qwen3.5 Omni Flash | Mercury 2 |
|---|---|---|
| Input ($/M tokens) | $0.1 | $0.25 |
| Output ($/M tokens) | $0.8 | $0.75 |
Verdict. Qwen3.5 Omni Flash and Mercury 2 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 1.1× the per-million-token cost, Mercury 2 is meaningfully cheaper if your traffic is output-heavy (long completions, document generation, agent loops). Mercury 2 makes more sense when output volume is low and absolute reasoning quality justifies the premium.
Strengths. Qwen3.5 Omni Flash is strongest on Intelligence Index (12.5). Mercury 2 leads on Coding Index (31.1), Intelligence Index (11.5).
Speed. On throughput, Mercury 2 generates tokens at 881 tok/s versus 227 tok/s — about 74% faster. On time-to-first-token, Qwen3.5 Omni Flash responds in 1900ms vs 4600ms, which matters most for chat-style UIs.
Provider. Alibaba and Inception sell to overlapping but distinct developer audiences: Alibaba tends to ship frontier reasoning models with premium positioning, while Inception 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): Qwen3.5 Omni Flash costs $15.00 ($180/year); Mercury 2 costs $18.75 ($225/year). At a smaller 5M-input/2M-output scale (single-developer tool or prototype): Qwen3.5 Omni Flash ≈ $2.10/run, Mercury 2 ≈ $2.75/run. At agent/realtime scale (200M input / 100M output per million requests): Qwen3.5 Omni Flash ≈ $100/run, Mercury 2 ≈ $125/run. Qwen3.5 Omni Flash 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
Qwen3.5 Omni Flash is cheaper overall. Its blended price (3:1 input/output ratio) is $0.28/M tokens vs $0.38/M for Mercury 2.
It's a tie — both models win 1 benchmarks each across 12 evaluated categories. See the detailed benchmark chart above for per-category results.
Mercury 2 generates tokens faster at 881 tok/s vs 227 tok/s. Qwen3.5 Omni Flash also has lower time-to-first-token (1.90s vs 4.60s).
Choose based on your priorities: Qwen3.5 Omni Flash for lower cost, both perform similarly on benchmarks, and Mercury 2 for faster generation. For latency-sensitive apps, check the TTFT comparison above.