Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | Step 3.7 Flash | DeepSeek R1 Distill Llama 70B |
|---|---|---|
| Input ($/M tokens) | $0.2 | $0.7 |
| Output ($/M tokens) | $1.15 | $1.1 |
Verdict. Step 3.7 Flash wins the overall benchmark matchup 2–0 across 2 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 Distill Llama 70B is meaningfully cheaper if your traffic is output-heavy (long completions, document generation, agent loops). DeepSeek R1 Distill Llama 70B makes more sense when output volume is low and absolute reasoning quality justifies the premium.
Strengths. Step 3.7 Flash is strongest on Coding Index (39.6), Intelligence Index (30.9). DeepSeek R1 Distill Llama 70B leads on Intelligence Index (9.8).
Speed. On throughput, Step 3.7 Flash generates tokens at 106 tok/s versus 28 tok/s — about 74% faster. On time-to-first-token, DeepSeek R1 Distill Llama 70B responds in 970ms vs 2730ms, which matters most for chat-style UIs.
Provider. StepFun and DeepSeek sell to overlapping but distinct developer audiences: StepFun 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): Step 3.7 Flash costs $23.25 ($279/year); DeepSeek R1 Distill Llama 70B costs $37.50 ($450/year). At a smaller 5M-input/2M-output scale (single-developer tool or prototype): Step 3.7 Flash ≈ $3.30/run, DeepSeek R1 Distill Llama 70B ≈ $5.70/run. At agent/realtime scale (200M input / 100M output per million requests): Step 3.7 Flash ≈ $155/run, DeepSeek R1 Distill Llama 70B ≈ $250/run. Step 3.7 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
Step 3.7 Flash is cheaper overall. Its blended price (3:1 input/output ratio) is $0.44/M tokens vs $0.80/M for DeepSeek R1 Distill Llama 70B.
Step 3.7 Flash wins 2 out of 12 benchmarks compared to 0 for DeepSeek R1 Distill Llama 70B. See the detailed benchmark chart above for per-category results.
Step 3.7 Flash generates tokens faster at 106 tok/s vs 28 tok/s. However, DeepSeek R1 Distill Llama 70B has lower time-to-first-token (0.97s vs 2.73s).
Choose based on your priorities: Step 3.7 Flash for lower cost, Step 3.7 Flash for stronger benchmark performance, and Step 3.7 Flash for faster generation. For latency-sensitive apps, check the TTFT comparison above.