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K2 Horizon 375B A23B

Institute of Foundation ModelsReleased Sep 3, 2026

K2 Horizon 375B A23B is not ranked on LMArena yet.

Key metrics

Arena score–Not yet rated
Intelligence30.5Variant: default
Coding61.5Artificial Analysis
List price in / out– / –USD per 1M tokens
Lowest route–Cheapest OpenRouter route
Context–tokens
Output speed128tok/sAA measured median
TTFT / first answer3.2 / 19sReasoning model: includes thinking

Sources & methodology

K2 Horizon 375B A23B (Institute of Foundation Models): Intelligence Index 30.5. Data updated Oct 9, 2026.

  • LMArena — Arena score, 95% confidence interval, votes and rank.
  • Artificial Analysis — Intelligence / Coding Index, output speed and latency (medians).
  • OpenRouter — Route prices, context length and listing date.

Arena scores use the Bradley-Terry model (not Elo); ± is the half-width of the 95% confidence interval. Latency figures are Artificial Analysis medians; for reasoning models, time to first token and to first answer include the thinking phase. Data syncs daily at 14:20 (UTC+8).

FAQ

What rank is K2 Horizon 375B A23B right now?

K2 Horizon 375B A23B has not been scored by LMArena yet, so it is not ranked here.

How fast is K2 Horizon 375B A23B?

Artificial Analysis measures about 128 output tokens per second, 3.2 s to the first token and 19 s to the first answer token; it is a reasoning model, so latency includes thinking time.

Is K2 Horizon 375B A23B open source? Can it be self-hosted?

K2 Horizon 375B A23B is a closed model, available only via official APIs or hosted services.

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