GPT-5.1 Codex mini vs DeepSeek Reasoner
Side-by-side comparison of pricing and capabilities
GPT-5.1 Codex mini
DeepSeek Reasoner
Input Price Comparison
| Attribute | GPT-5.1 Codex mini | DeepSeek Reasoner |
|---|---|---|
| Provider | OpenAI | DeepSeek |
| Input Price | $0.25 /1M tokens | $0.55 /1M tokens |
| Output Price | $2 /1M tokens | $2.19 /1M tokens |
| Cached Input | $0.025 /1M tokens | $0.055 /1M tokens |
| Context Window | 400K | 128K |
| Type | chat | reasoning |
| Status | current | current |
Capability Comparison
| Capability | GPT-5.1 Codex mini | DeepSeek Reasoner |
|---|---|---|
| coding | ||
| reasoning |
Which should you choose?
Budget-conscious: GPT-5.1 Codex mini is 55% cheaper on input tokens ($0.25 vs $0.55 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-5.1 Codex mini supports 1 capabilities (coding), while DeepSeek Reasoner supports 2 (reasoning, coding).
Frequently Asked Questions
Which is cheaper: GPT-5.1 Codex mini or DeepSeek Reasoner?
GPT-5.1 Codex mini costs $0.25/1M input vs DeepSeek Reasoner at $0.55/1M input. GPT-5.1 Codex mini is 55% cheaper on input tokens.
How do output prices compare between GPT-5.1 Codex mini and DeepSeek Reasoner?
GPT-5.1 Codex mini output: $2/1M, DeepSeek Reasoner output: $2.19/1M. 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 DeepSeek Reasoner best used for?
DeepSeek Reasoner is suited for complex reasoning, analysis, and tasks that benefit from its reasoning and coding capabilities.