Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | Grok 4.3 (high) | Gemini 3.5 Flash-Lite |
|---|---|---|
| Input ($/M tokens) | $1.25 | $0.3 |
| Output ($/M tokens) | $2.5 | $2.5 |
Verdict. Grok 4.3 (high) and Gemini 3.5 Flash-Lite 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, Gemini 3.5 Flash-Lite is meaningfully cheaper if your traffic is output-heavy (long completions, document generation, agent loops). Gemini 3.5 Flash-Lite makes more sense when output volume is low and absolute reasoning quality justifies the premium.
Strengths. Grok 4.3 (high) is strongest on Coding Index (42.2), Intelligence Index (37.9). Gemini 3.5 Flash-Lite leads on Coding Index (49.3), Intelligence Index (37.4).
Speed. On throughput, Gemini 3.5 Flash-Lite generates tokens at 332 tok/s versus 146 tok/s — about 56% faster. On time-to-first-token, Gemini 3.5 Flash-Lite responds in 9760ms vs 20940ms, which matters most for chat-style UIs.
Provider. SpaceXAI and Google sell to overlapping but distinct developer audiences: SpaceXAI tends to ship frontier reasoning models with premium positioning, while Google 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): Grok 4.3 (high) costs $75.00 ($900/year); Gemini 3.5 Flash-Lite costs $46.50 ($558/year). At a smaller 5M-input/2M-output scale (single-developer tool or prototype): Grok 4.3 (high) ≈ $11.25/run, Gemini 3.5 Flash-Lite ≈ $6.50/run. At agent/realtime scale (200M input / 100M output per million requests): Grok 4.3 (high) ≈ $500/run, Gemini 3.5 Flash-Lite ≈ $310/run. Gemini 3.5 Flash-Lite 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
Gemini 3.5 Flash-Lite is cheaper overall. Its blended price (3:1 input/output ratio) is $0.85/M tokens vs $1.56/M for Grok 4.3 (high).
It's a tie — both models win 1 benchmarks each across 12 evaluated categories. See the detailed benchmark chart above for per-category results.
Gemini 3.5 Flash-Lite generates tokens faster at 332 tok/s vs 146 tok/s. However, Gemini 3.5 Flash-Lite has lower time-to-first-token (9.76s vs 20.94s).
Choose based on your priorities: Gemini 3.5 Flash-Lite for lower cost, both perform similarly on benchmarks, and Gemini 3.5 Flash-Lite for faster generation. For latency-sensitive apps, check the TTFT comparison above.