Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | Devstral Small 2 | Mercury 2 |
|---|---|---|
| Input ($/M tokens) | $0 | $0.25 |
| Output ($/M tokens) | $0 | $0.75 |
Verdict. Mercury 2 takes the aggregate benchmark matchup 2–0 across 2 categories. Real workloads usually care about a handful of specific tasks — see the per-benchmark table above.
Pricing. Pricing varies significantly between these models — check the table above for the exact per-token rates. Many production workloads actually surface input-token cost (retrieval-augmented prompts, code-context windows), so factor both directions.
Strengths. Devstral Small 2 is strongest on Coding Index (29.3), Intelligence Index (8.4). Mercury 2 leads on Coding Index (31.1), Intelligence Index (11.5).
Speed. On throughput, Mercury 2 generates tokens at 881 tok/s versus 139 tok/s — about 84% faster. On time-to-first-token, Devstral Small 2 responds in 2230ms vs 4600ms, which matters most for chat-style UIs.
Provider. Mistral and Inception sell to overlapping but distinct developer audiences: Mistral 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): Devstral Small 2 costs $0.00 ($0/year); Mercury 2 costs $18.75 ($225/year). At a smaller 5M-input/2M-output scale (single-developer tool or prototype): Devstral Small 2 ≈ $0.00/run, Mercury 2 ≈ $2.75/run. At agent/realtime scale (200M input / 100M output per million requests): Devstral Small 2 ≈ $0/run, Mercury 2 ≈ $125/run. Devstral Small 2 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
Devstral Small 2 is cheaper overall. Its blended price (3:1 input/output ratio) is $0.00/M tokens vs $0.38/M for Mercury 2.
Mercury 2 wins 2 out of 12 benchmarks compared to 0 for Devstral Small 2. See the detailed benchmark chart above for per-category results.
Mercury 2 generates tokens faster at 881 tok/s vs 139 tok/s. Devstral Small 2 also has lower time-to-first-token (2.23s vs 4.60s).
Choose based on your priorities: Devstral Small 2 for lower cost, Mercury 2 for stronger benchmark performance, and Mercury 2 for faster generation. For latency-sensitive apps, check the TTFT comparison above.