Institute of Foundation Models

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Open weights model

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Released September 2026

K2 Horizon 375B A23B API Provider Benchmarking & Analysis

Model Comparison

This analysis is intended to support you in choosing the best API provider of K2 Horizon 375B A23B for your use-case.

Fastest

IFM

664.6 t/s

Output speed

Total 1 provider

Lowest Latency

IFM

5.37 s

Time to first answer token

Total 1 provider

Lowest Price

IFM

$0.00

Blended price (per 1M tokens)

Total 1 provider

K2 Horizon 375B A23B is available through IFM.

Speed

Output tokens per second · Higher is better

Latency

Seconds to first answer token received · Lower is better

Price

USD per 1M tokens (blended) · Lower is better

Update: Default performance benchmarking workload has updated to 10k input tokens to better reflect production use cases. You can still select different workloads above.

Pricing

Pricing: Cache Hit, Input, and Output: K2 Horizon 375B A23B

Price (USD per M Tokens) · Lower is better · 10,000 input tokens

Price per token for cached prompts (previously processed), typically offering a significant discount compared to regular input price, represented as USD per million tokens. The values shown here are the cache hit price; cache write and cache storage are billed separately and vary by provider — see "Cache pricing by provider" for detail.

Cost per Intelligence Index Task: K2 Horizon 375B A23B

Weighted average cost (USD) per Intelligence Index task · Segmented by token type · Lower is better

Weighted average cost per Intelligence Index task. Each evaluation’s cost is calculated from input, cache hit, cache write, reasoning, and answer token prices, divided by task count, and weighted by its Intelligence Index weight.

Output Speed vs. Price: K2 Horizon 375B A23B

Blended at 7:2:1 (cache-input-output) · Output speed: output tokens per second · USD per 1M tokens (blended)

Most attractive quadrant

Tokens per second received while the model is generating tokens (ie. after first chunk has been received from the API for models which support streaming).

Speed

Measured by Output Speed (tokens per second)

Output Speed: K2 Horizon 375B A23B

Output speed: output tokens per second · 10,000 input tokens

Tokens per second received while the model is generating tokens (ie. after first chunk has been received from the API for models which support streaming).

Figures represent performance of the model's first-party API or the median across providers where a first-party API is not available.

Time per Intelligence Index Task: K2 Horizon 375B A23B

Weighted average decode time (minutes) per Intelligence Index task · Excludes TTFT and overhead time · Lower is better

The weighted average time (seconds) per Artificial Analysis Intelligence Index task. This is calculated by dividing output tokens per task by output speed, weighted by the relative weights of each benchmark in the Intelligence Index.

Cost per Task vs. Time per Task: K2 Horizon 375B A23B

Weighted average cost (USD) per Intelligence Index task · Weighted average decode time (minutes) per Intelligence Index task

Most attractive quadrant

Latency

Measured by Time (seconds) to First Token

Time to First Answer Token: K2 Horizon 375B A23B

Seconds to first token received · Lower is better · 10,000 input tokens

Time to first answer token received, in seconds, after API request sent. For reasoning models, this includes the 'thinking' time of the model before providing an answer. For models which do not support streaming, this represents time to receive the completion.

Figures represent median (P50) measurement over the past 72 hours to reflect sustained changes in performance.

Cache Behaviour

Cache Hit Rate: K2 Horizon 375B A23B

Share of cacheable input tokens served from cache · Median of the last four weeks, updated Oct 26, 2026

The share of cacheable input tokens served from the provider's prompt cache, measured during multi-turn agentic coding sessions. We regularly measure each endpoint and report a representative rate based on recent measurements. Higher values mean more of the input is billed at the cheaper cache-hit price, where the provider offers one, which lowers the effective cost of agentic workloads. For further details, see our methodology page.

Cost per Task vs. Cache Hit Rate: K2 Horizon 375B A23B

Weighted average cost (USD) per Intelligence Index task · Cache hit rate: median of the last four weeks, updated Oct 26, 2026

Most attractive quadrant

End-to-End Response Time

Seconds to output 500 tokens, calculated based on time to first token, 'thinking' time for reasoning models, and output speed

End-to-End Response Time: K2 Horizon 375B A23B

Seconds to output 500 tokens, including reasoning model 'thinking' time · Lower is better · 10,000 input tokens

Seconds to receive a 500 token response. Key components:

Input time: Time to receive the first response token
Thinking time (only for reasoning models): Time reasoning models spend outputting tokens to reason prior to providing an answer. Amount of tokens based on the average reasoning tokens across a diverse set of 60 prompts (methodology details).
Answer time: Time to generate 500 output tokens, based on output speed

Key Comparison Metrics & API Features



Institute of Foundation Models	524k			Open	$0.00	665	2.36	6.12	3.01

Frequently Asked Questions

Common questions about K2 Horizon 375B A23B providers

K2 Horizon 375B A23B is available through 1 API provider: IFM. Each provider offers different performance characteristics and pricing.

K2 Horizon 375B A23B is currently available through 1 API provider that we benchmark and track.

The fastest provider for K2 Horizon 375B A23B by output speed is IFM (664.6 t/s). Output speed measures how quickly tokens are generated after the model starts responding.

The provider with the lowest time to first answer token for K2 Horizon 375B A23B is IFM (5.37s). Lower latency means faster initial response time.

The most affordable provider for K2 Horizon 375B A23B by blended price is IFM ($0.00 per 1M tokens). Blended price uses a 7:2:1 cache hit/input/output token ratio.

The provider with the lowest input token pricing for K2 Horizon 375B A23B is IFM ($0.00 per 1M input tokens).

The provider with the lowest output token pricing for K2 Horizon 375B A23B is IFM ($0.00 per 1M output tokens).

The only provider of K2 Horizon 375B A23B supports JSON mode for structured output.

The only provider of K2 Horizon 375B A23B supports function calling (tool use).

IFM leads across all key metrics for K2 Horizon 375B A23B, offering the fastest speed, lowest latency, and most competitive pricing.

When choosing a provider for K2 Horizon 375B A23B, consider: output speed (for throughput-intensive tasks), latency (for interactive applications requiring quick first responses), pricing (for cost-sensitive workloads), and API features like JSON mode or function calling.

Yes, provider performance can vary over time due to infrastructure changes, load balancing, and updates. We continuously benchmark all providers and display historical performance trends in the "Over Time" charts.

For information about K2 Horizon 375B A23B's intelligence, capabilities, modalities, and how it compares to other models, see the model overview page. View model overview

K2 Horizon 375B A23B API Provider Benchmarking & Analysis

Fastest

Lowest Latency

Lowest Price

Speed

Latency

Price

Pricing

Pricing: Cache Hit, Input, and Output: K2 Horizon 375B A23B

Cache Hit

Cost per Intelligence Index Task: K2 Horizon 375B A23B

Cost per Intelligence Index Task

Output Speed vs. Price: K2 Horizon 375B A23B

Output Speed

Speed

Output Speed: K2 Horizon 375B A23B

Output Speed

Model Performance Representation

Time per Intelligence Index Task: K2 Horizon 375B A23B

Time per Intelligence Index Task

Cost per Task vs. Time per Task: K2 Horizon 375B A23B

Cost per Intelligence Index Task

Latency

Time to First Answer Token: K2 Horizon 375B A23B

Time to First Answer Token

Median

Cache Behaviour

Cache Hit Rate: K2 Horizon 375B A23B

What Cache Hit Rate Shows

Cost per Task vs. Cache Hit Rate: K2 Horizon 375B A23B

Cost per Intelligence Index Task

End-to-End Response Time

End-to-End Response Time: K2 Horizon 375B A23B

End-to-End Response Time

Key Comparison Metrics & API Features

Frequently Asked Questions

Where can I access K2 Horizon 375B A23B?

How many API providers offer K2 Horizon 375B A23B?

Which provider is fastest for K2 Horizon 375B A23B?

Which provider has the lowest latency for K2 Horizon 375B A23B?

Which provider is cheapest for K2 Horizon 375B A23B?

Which provider has the lowest input price for K2 Horizon 375B A23B?

Which provider has the lowest output price for K2 Horizon 375B A23B?

Which K2 Horizon 375B A23B providers support JSON mode?

Which K2 Horizon 375B A23B providers support function calling?

Which is the best provider for K2 Horizon 375B A23B?

How do I choose a provider for K2 Horizon 375B A23B?

Does provider performance for K2 Horizon 375B A23B change over time?

What are the overall capabilities of K2 Horizon 375B A23B?