OpenAI Codex Mini vs Horizon Alpha
Compare OpenAI Codex Mini by OpenAI against Horizon Alpha by OpenRouter, context windows of 200K vs 256K, tested across 9 shared challenges. Updated April 2026.
Which is better, OpenAI Codex Mini or Horizon Alpha?
OpenAI Codex Mini and Horizon Alpha are both competitive models. OpenAI Codex Mini costs $1.5/M input tokens vs $0/M for Horizon Alpha. Context windows: 200K vs 256K tokens. Compare their real outputs side by side below.
Key Differences Between OpenAI Codex Mini and Horizon Alpha
OpenAI Codex Mini is made by openai while Horizon Alpha is from openrouter. OpenAI Codex Mini has a 200K token context window compared to Horizon Alpha's 256K. On pricing, OpenAI Codex Mini costs $1.5/M input tokens vs $0/M for Horizon Alpha.
No community votes yet. On paper, Horizon Alpha has the edge — bigger model tier, newer.
vsAsk them anything yourself
Some models write identically. You are paying for the brand.
178 models fingerprinted across 32 writing dimensions. Free research.
185x
price gap between models that write identically
178
models
12
clone pairs
32
dimensions
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
