GPT-4o Mini vs GPT-5.1 Codex mini
Side-by-side comparison of pricing and capabilities
GPT-4o Mini
GPT-5.1 Codex mini
Input Price Comparison
| Attribute | GPT-4o Mini | GPT-5.1 Codex mini |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Input Price | $0.15 /1M tokens | $0.25 /1M tokens |
| Output Price | $0.6 /1M tokens | $2 /1M tokens |
| Cached Input | $0.075 /1M tokens | $0.025 /1M tokens |
| Context Window | 128K | 400K |
| Type | chat | chat |
| Status | current | current |
Capability Comparison
| Capability | GPT-4o Mini | GPT-5.1 Codex mini |
|---|---|---|
| coding | ||
| vision | ||
| multilingual |
Which should you choose?
Budget-conscious: GPT-4o Mini is 40% cheaper on input tokens ($0.15 vs $0.25 per 1M tokens).
Context-heavy tasks: GPT-5.1 Codex mini offers a larger context window (400K vs 128K), making it better for long documents or conversations.
Capability fit: GPT-4o Mini supports 3 capabilities (coding, vision, multilingual), while GPT-5.1 Codex mini supports 1 (coding).
Frequently Asked Questions
Which is cheaper: GPT-4o Mini or GPT-5.1 Codex mini?
GPT-4o Mini costs $0.15/1M input vs GPT-5.1 Codex mini at $0.25/1M input. GPT-4o Mini is 40% cheaper on input tokens.
How do output prices compare between GPT-4o Mini and GPT-5.1 Codex mini?
GPT-4o Mini output: $0.6/1M, GPT-5.1 Codex mini output: $2/1M. GPT-4o Mini is more economical for generation-heavy workloads.
What is GPT-4o Mini best used for?
GPT-4o Mini is best for budget-conscious applications, high-volume chatbots, and tasks where cost efficiency is the primary concern.
What is GPT-5.1 Codex mini best used for?
GPT-5.1 Codex mini is suited for complex reasoning, analysis, and tasks that benefit from its coding capabilities.