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K2 Horizon 375B A23B

K2 Horizon · Released 2026-09-03

IFM (MBZUAI) 3 Sep 2026 flagship: 375B-A23B sparse MoE, 512K native context, Apache 2.0 weights. Official HF is IFM/K2-Horizon-375B-A23B. The 10 Sep AA snapshot lists API price as $0 / $0 — do not invent a hosted dollar rate.

Open research fleet flagship for reproducing training and running a mid-size MoE locally or via IFM partners. Prefer the AA ledger row and the IFM launch note over vendor eval tables.

Composite62
Context524K
Input / 1MFree
Output / 1MFree
Knowledge cutoffunpublished
Statussolid

Family profile

Best published score in each covered benchmark family.

71/100 avg
Reasoning
87
Coding
43
Agentic
72
Long context
80

4 tested benchmark families

Editor's note
IFM vendor tables stay off the ledger. Editorial depth still needs a desk pass.
Benchmark placements

Where K2 Horizon 375B A23B places on each public benchmark source that publishes a row. Rank counts every model with a latest row in the same test — not a universal quality score.

BenchmarkFamilyRankScoreSourceDate
Terminal-BenchAgentic#38/ 16772Artificial Analysis2026-09-28
AA-LCRLong context#43/ 18480Artificial Analysis2026-09-28
GPQA DiamondReasoning#72/ 18487Artificial Analysis2026-09-28
SciCodeCoding#74/ 9743Artificial Analysis2026-09-28
Humanity's Last ExamReasoning#75/ 18632Artificial Analysis2026-09-28
AA output speedPerformance#151/ 191Artificial Analysis2026-09-28
Family context

The three highest-scoring models with pages in each capability family. Where K2 Horizon 375B A23B shows up, it's highlighted.

ReasoningK2 Horizon 375B A23B · 87
  1. 1
    GPT-6 Astra
    96
  2. 2
    Claude Mythos Preview
    95
  3. 3
    Gemini 3.7 Flash
    95
Long contextK2 Horizon 375B A23B · 80
  1. 1
    Kimi K3
    89
  2. 2
    MiMo-V2.6-Pro
    86
  3. 3
    Claude Fable 5.1
    85
Newest receipts

Benchmark rows added to the public ledger for K2 Horizon 375B A23B in the last 120 days. Older rows live in the full table below.

6 recent
BenchmarkFamilyScoreSourceDays ago
AA-LCRLong context80%Artificial Analysis13
AA output speedPerformance0 t/sArtificial Analysis13
GPQA DiamondReasoning87.3%Artificial Analysis13
Humanity's Last ExamReasoning32%Artificial Analysis13
SciCodeCoding42.9%Artificial Analysis13
Terminal-BenchAgentic71.91%Artificial Analysis13
Family coverage

A high composite that hides a weak family is a trap. These bars surface the families where this model hasn't been publicly tested, and where it leads.

Reasoning87
Coding43
Agentic72
Long context80
Price vs. performance
0255075100$0.10$0.30$1$3$10$30input USD / 1M tokens · log scale →← intelligence

Hover any dot for name, score, and input price. Keyboard: tab through the top twelve, or use the ranking below.

AnthropicOpenAIGoogleAlibabaMetaZhipuxAIDeepSeekMiniMaxXiaomiMoonshotOtherMeituanMistralNVIDIACohere

Full benchmark ledger

Every catalog benchmark for K2 Horizon 375B A23B. Scores link to the original source; gaps mean no public row exists yet.

6 sourced rows

6 of 13 catalog benchmarks have a sourced row for K2 Horizon 375B A23B.

Reasoning

Coding

Agentic

Long context

Performance

Changelog
  1. Hosted list still $0 / $0.
  2. IFM releases the K2 Horizon fleet under Apache 2.0, including 375B-A23B weights (512K context), data or recipes, code, and logs.
Sources

Questions this model page answers

Every answer below is assembled from the dated fields on this page. Nothing is written separately for search.

What is K2 Horizon 375B A23B?

K2 Horizon 375B A23B is a Other model: IFM (MBZUAI) 3 Sep 2026 flagship: 375B-A23B sparse MoE, 512K native context, Apache 2.0 weights. Official HF is IFM/K2-Horizon-375B-A23B. The 10 Sep AA snapshot lists API price as $0 / $0 — do not invent a hosted dollar rate.

What is K2 Horizon 375B A23B for?

Open research fleet flagship for reproducing training and running a mid-size MoE locally or via IFM partners. Prefer the AA ledger row and the IFM launch note over vendor eval tables.

What does K2 Horizon 375B A23B cost?

K2 Horizon 375B A23B lists Free input and Free output per 1M tokens. Pricing last checked 2026-09-12.

How large is the K2 Horizon 375B A23B context window?

K2 Horizon 375B A23B publishes a 524K token context window.

What is the VerdictPal status of K2 Horizon 375B A23B?

K2 Horizon 375B A23B carries Solid status on the model atlas.

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