Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | Gemini 3 Flash Preview (Reasoning) | DeepSeek R1 0528 (May '25) |
|---|---|---|
| Input ($/M tokens) | $0.5 | $1.35 |
| Output ($/M tokens) | $3 | $3 |
Verdict. Gemini 3 Flash Preview (Reasoning) wins the overall benchmark matchup 1–0 across 1 overlapping categories, but raw benchmark score is only one input to the decision.
Pricing. Both models sit in the budget bracket for output-token pricing. At 1.0× the per-million-token cost, DeepSeek R1 0528 (May '25) is meaningfully cheaper if your traffic is output-heavy (long completions, document generation, agent loops). DeepSeek R1 0528 (May '25) makes more sense when output volume is low and absolute reasoning quality justifies the premium.
Strengths. Gemini 3 Flash Preview (Reasoning) is strongest on Intelligence Index (38.7). DeepSeek R1 0528 (May '25) leads on Intelligence Index (20.4).
Speed. Speed data is incomplete for this pair; benchmark and price should decide.
Provider. Google and DeepSeek sell to overlapping but distinct developer audiences: Google tends to ship frontier reasoning models with premium positioning, while DeepSeek 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): Gemini 3 Flash Preview (Reasoning) costs $60.00 ($720/year); DeepSeek R1 0528 (May '25) costs $85.50 ($1026/year). At a smaller 5M-input/2M-output scale (single-developer tool or prototype): Gemini 3 Flash Preview (Reasoning) ≈ $8.50/run, DeepSeek R1 0528 (May '25) ≈ $12.75/run. At agent/realtime scale (200M input / 100M output per million requests): Gemini 3 Flash Preview (Reasoning) ≈ $400/run, DeepSeek R1 0528 (May '25) ≈ $570/run. Gemini 3 Flash Preview (Reasoning) 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.
Data from Artificial Analysis API — 12 benchmarks
Gemini 3 Flash Preview (Reasoning) is cheaper overall. Its blended price (3:1 input/output ratio) is $1.13/M tokens vs $1.76/M for DeepSeek R1 0528 (May '25).
Gemini 3 Flash Preview (Reasoning) wins 1 out of 12 benchmarks compared to 0 for DeepSeek R1 0528 (May '25). See the detailed benchmark chart above for per-category results.
Gemini 3 Flash Preview (Reasoning) generates tokens faster at 189 tok/s vs — tok/s. Gemini 3 Flash Preview (Reasoning) also has lower time-to-first-token (6.57s vs —s).
Choose based on your priorities: Gemini 3 Flash Preview (Reasoning) for lower cost, Gemini 3 Flash Preview (Reasoning) for stronger benchmark performance, and Gemini 3 Flash Preview (Reasoning) for faster generation. For latency-sensitive apps, check the TTFT comparison above.