GPT-5.1 Codex mini vs Gemini 2.5 Flash
Side-by-side comparison of pricing and capabilities
GPT-5.1 Codex mini
Gemini 2.5 Flash
Input Price Comparison
| Attribute | GPT-5.1 Codex mini | Gemini 2.5 Flash |
|---|---|---|
| Provider | OpenAI | |
| Input Price | $0.25 /1M tokens | $0.3 /1M tokens |
| Output Price | $2 /1M tokens | $2.5 /1M tokens |
| Cached Input | $0.025 /1M tokens | $0.030 /1M tokens |
| Context Window | 400K | 1.0M |
| Type | chat | chat |
| Status | current | current |
Capability Comparison
| Capability | GPT-5.1 Codex mini | Gemini 2.5 Flash |
|---|---|---|
| coding | ||
| vision | ||
| multilingual |
Which should you choose?
Budget-conscious: GPT-5.1 Codex mini is 17% cheaper on input tokens ($0.25 vs $0.3 per 1M tokens).
Context-heavy tasks: Gemini 2.5 Flash offers a larger context window (1.0M vs 400K), making it better for long documents or conversations.
Capability fit: GPT-5.1 Codex mini supports 1 capabilities (coding), while Gemini 2.5 Flash supports 3 (coding, vision, multilingual).
Frequently Asked Questions
Which is cheaper: GPT-5.1 Codex mini or Gemini 2.5 Flash?
GPT-5.1 Codex mini costs $0.25/1M input vs Gemini 2.5 Flash at $0.3/1M input. GPT-5.1 Codex mini is 17% cheaper on input tokens.
How do output prices compare between GPT-5.1 Codex mini and Gemini 2.5 Flash?
GPT-5.1 Codex mini output: $2/1M, Gemini 2.5 Flash 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 Gemini 2.5 Flash best used for?
Gemini 2.5 Flash is suited for complex reasoning, analysis, and tasks that benefit from its coding and vision capabilities.