GPT-5.1 Codex mini vs Kimi K2 0905 Preview
Side-by-side comparison of pricing and capabilities
GPT-5.1 Codex mini
Kimi K2 0905 Preview
Input Price Comparison
| Attribute | GPT-5.1 Codex mini | Kimi K2 0905 Preview |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Input Price | $0.25 /1M tokens | $0.6 /1M tokens |
| Output Price | $2 /1M tokens | $2.5 /1M tokens |
| Cached Input | $0.025 /1M tokens | $0.150 /1M tokens |
| Context Window | 400K | 131K |
| Type | chat | chat |
| Status | current | preview |
Capability Comparison
| Capability | GPT-5.1 Codex mini | Kimi K2 0905 Preview |
|---|---|---|
| coding | ||
| reasoning |
Which should you choose?
Budget-conscious: GPT-5.1 Codex mini is 58% cheaper on input tokens ($0.25 vs $0.6 per 1M tokens).
Context-heavy tasks: GPT-5.1 Codex mini offers a larger context window (400K vs 131K), making it better for long documents or conversations.
Capability fit: GPT-5.1 Codex mini supports 1 capabilities (coding), while Kimi K2 0905 Preview supports 2 (reasoning, coding).
Frequently Asked Questions
Which is cheaper: GPT-5.1 Codex mini or Kimi K2 0905 Preview?
GPT-5.1 Codex mini costs $0.25/1M input vs Kimi K2 0905 Preview at $0.6/1M input. GPT-5.1 Codex mini is 58% cheaper on input tokens.
How do output prices compare between GPT-5.1 Codex mini and Kimi K2 0905 Preview?
GPT-5.1 Codex mini output: $2/1M, Kimi K2 0905 Preview output: $2.5/1M. GPT-5.1 Codex mini is more economical for generation-heavy workloads.
What is GPT-5.1 Codex mini best used for?
GPT-5.1 Codex mini is best for budget-conscious applications, high-volume chatbots, and tasks where cost efficiency is the primary concern.
What is Kimi K2 0905 Preview best used for?
Kimi K2 0905 Preview is suited for complex reasoning, analysis, and tasks that benefit from its reasoning and coding capabilities.