Gemini 3.1 Flash Lite Preview vs GPT-5.1-Codex-Mini
A side-by-side comparison of two multimodal models — real specs, pricing, strengths and weaknesses, and a clear verdict on which to choose. Kept current by our agents.
Quick verdict: which should you choose?
Choose Gemini 3.1 Flash Lite Preview if you need
- ✓higher intelligence (38.6) and strong coding specialization for technical workflows
- ✓native image + text support in extended sessions
- ✓400k context window without needing maximum scale
- ✓proprietary OpenAI model for coding-focused multimodal tasks
Choose GPT-5.1-Codex-Mini if you need
- ✓maximum output speed (310.24 t/s) and lowest price ($1.5/1M)
- ✓largest context (1,048,576 tokens) for document and media tasks
- ✓broad native support for video, audio, and files
- ✓lightweight design optimized for fast, large-context multimodal work
Verdict
GPT-5.1-Codex-Mini leads with a higher intelligence index (38.6 vs 33.5) and coding specialization plus native image+text support, while Gemini 3.1 Flash Lite Preview wins on speed (310.24 t/s vs 214.62), lower price ($1.5 vs $2 per 1M), and over twice the context (1M+ vs 400k tokens) with broader video/audio/file modalities. The OpenAI model suits technical depth; the Google preview prioritizes efficiency and scale.
Gemini 3.1 Flash Lite Preview vs GPT-5.1-Codex-Mini: side by side
| Spec | Gemini 3.1 Flash Lite Preview | GPT-5.1-Codex-Mini | Winner |
|---|---|---|---|
| Intelligence | 33.5 | 38.6 | GPT-5.1-Codex-Mini |
| Output speed | 310 t/s | 215 t/s | Gemini 3.1 Flash Lite Preview |
| Output price | $1.50/1M | $2.00/1M | Gemini 3.1 Flash Lite Preview |
| Context | 1049K | 400K | Gemini 3.1 Flash Lite Preview |
| Params | — | — | Tie |
| Type | Proprietary | Proprietary | Tie |
| Provider | OpenAI | Tie |
Detailed analysis
Intelligence
Winner: GPT-5.1-Codex-MiniGPT-5.1-Codex-Mini scores 38.6 on the intelligence index compared to 33.5 for Gemini 3.1 Flash Lite Preview. This edge aligns with its coding specialization and suitability for complex technical reasoning despite the mini variant's noted limits.
Speed & Pricing
Winner: Gemini 3.1 Flash Lite PreviewGemini 3.1 Flash Lite Preview delivers higher output speed at 310.24 t/s versus 214.62 t/s and costs $1.5 per 1M tokens versus $2. Its lightweight design trades some depth for these efficiency gains.
Context & Modalities
Winner: Gemini 3.1 Flash Lite PreviewGemini offers 1,048,576 tokens of context versus 400,000 and supports video, audio, and files in addition to text and images. GPT-5.1-Codex-Mini is limited to image + text but optimized for extended coding workflows.
Specialization
Winner: GPT-5.1-Codex-MiniGPT-5.1-Codex-Mini is explicitly positioned as a multimodal coding model from OpenAI, while Gemini 3.1 Flash Lite Preview is a general-purpose efficient preview from Google. The former's strengths center on technical depth; the latter on broad multimodal speed.
Gemini 3.1 Flash Lite Preview
Pros
- +Broad native support for multiple modalities
- +Very large context window for document and media tasks
- +Lightweight design optimized for speed
- +Unified handling of video, audio and files
Cons
- –Preview model may show inconsistent behavior
- –Lite variant trades depth for efficiency
- –Experimental features can be less reliable than stable releases
GPT-5.1-Codex-Mini
Pros
- +Very large context window
- +Strong coding specialization
- +Native image + text support
- +Suitable for extended technical workflows
Cons
- –Mini variant may have reduced depth on complex reasoning
- –Limited to image and text modalities
- –Trade-off between context size and response speed
Summary: Gemini 3.1 Flash Lite Preview vs GPT-5.1-Codex-Mini
Select GPT-5.1-Codex-Mini when coding intelligence and image-text workflows matter most. Choose Gemini 3.1 Flash Lite Preview for faster, cheaper, larger-context handling of diverse media and documents. The decision hinges on whether depth in code or breadth in speed and modalities is the priority.
Frequently asked questions
GPT-5.1-Codex-Mini is stronger on intelligence and coding tasks; Gemini 3.1 Flash Lite Preview is better on speed, price, and context size with more modalities.