Output tokens cost $16.50 per million on Grok 4 and $15.00 per million on Kimi K3. Input tokens cost $3.30 per million on Grok 4 and $3.00 per million on Kimi K3. Cached input tokens are billed at $0.83 per million on Grok 4 and $0.30 per million on Kimi K3. Context lengths are 256,000 tokens on Grok 4 and 1,048,576 tokens on Kimi K3. Time to first token (TTFT) measured on AIHubMix is 2.7s on Grok 4 and 0.9s on Kimi K3. Measured output throughput is 54.5 tok/s on Grok 4 and 73.1 tok/s on Kimi K3. On the LMArena coding leaderboard Grok 4 scores 1436 and Kimi K3 scores 1531.
Grok 4
Kimi K3Grok, their latest and greatest flagship model, offers unparalleled performance in natural language, math, and reasoning – the perfect jack of all trades. The current pointing model version is grok-4-0709.
Kimi K3 is Kimi’s flagship model for long-horizon coding and end-to-end knowledge work, with a 1M-token context window and industry-leading intelligence.
Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.
Promotional prices show the discounted rate; see each model page for promotion windows.
Daily traffic served through AIHubMix — how demand for each model is trending.
Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.
LMArena ratings by capability (Bradley-Terry, commonly called Elo). Higher is better.
Source: LMArena (arena.ai) leaderboard, imported by AIHubMix. Models without published ratings are omitted per chart.
Estimate your monthly bill for the same workload on each model.
Monthly = daily × 30. Discounted rates applied where a promotion is active.
Kimi K3: $15.00/M output tokens; Grok 4: $16.50/M. Use the cost calculator above to estimate your own workload.
Kimi K3: 1531; Grok 4: 1436 (LMArena coding leaderboard).
Kimi K3: 0.9s time to first token measured on AIHubMix; see the live performance charts above for how each model behaves across the day.
Grok 4 accepts 256,000 and Kimi K3 accepts 1,048,576 input tokens. Maximum output per request is 64,000 tokens on Grok 4 and 1,048,576 tokens on Kimi K3.
Kimi K3 at 73.1 tok/s and Grok 4 at 54.5 tok/s, measured as output throughput on AIHubMix — a separate metric from time to first token.
Grok 4 accepts text and image input and supports function calling, structured outputs and thinking; Kimi K3 accepts text, image and video input and supports thinking, function calling and structured outputs.
Yes. AIHubMix serves every model on this page behind one OpenAI-compatible endpoint, so switching between them is a one-line change to the model field — no second account, key or SDK.
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