Horizon Alpha

Text input Image input Text output Unavailable
Author's Description

This is a cloaked model provided to the community to gather feedback. Note: It’s free to use during this testing period, and prompts and completions are logged by the model creator for feedback and training.

Key Specifications
Cost
$
Context
256K
Released
Jul 30, 2025
Speed
Ability
Reliability
Supported Parameters

This model supports the following parameters:

Tools Structured Outputs Tool Choice Response Format Max Tokens
Features

This model supports the following features:

Tools Response Format Structured Outputs
Performance Summary

Horizon Alpha, a cloaked model from openrouter, demonstrates exceptional performance across various benchmarks, particularly excelling in reliability and speed. It consistently ranks among the fastest models, achieving the 83rd percentile in speed across five benchmarks. While specific cost data is unavailable, its performance suggests it operates within a free tier during this testing period, offering significant value. The model boasts a perfect 100% success rate across all benchmarks, indicating outstanding reliability with no technical failures. In terms of specific performance, Horizon Alpha achieved near-perfect accuracy in Ethics (100%) and General Knowledge (99.5%), securing top positions in accuracy and cost efficiency for these categories. It also showed remarkable proficiency in Coding, reaching 97.0% accuracy and ranking #1 in cost efficiency and among the top 3 in accuracy. Its Instruction Following capabilities are strong at 84.0% accuracy, also leading in cost efficiency. The Email Classification benchmark saw a respectable 98.0% accuracy. Key strengths include its unparalleled reliability, high accuracy in critical domains like ethics and coding, and impressive speed. No significant weaknesses are apparent from the provided data.

Model Pricing

Current Pricing

Feature Price (per 1M tokens)
Prompt $0
Completion $0

Price History

Available Endpoints
Provider Endpoint Name Context Length Pricing (Input) Pricing (Output)
Stealth
Stealth | openrouter/horizon-alpha 256K $0 / 1M tokens $0 / 1M tokens
Benchmark Results
Benchmark Category Reasoning Strategy Free Executions Accuracy Cost Duration
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