Gemini 2.5 Flash Lite Preview 09-2025 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 2.5 Flash Lite Preview 09-2025 if you need
- ✓Need higher measured intelligence and coding specialization for technical workflows
- ✓Require documented output speed of 214.62 t/s with image+text input
- ✓Work with extended contexts up to 400k tokens in a proprietary OpenAI model
Choose GPT-5.1-Codex-Mini if you need
- ✓Need the lowest output price at $0.4 per 1M tokens for high-volume use
- ✓Require the largest context window (1,048,576 tokens) plus audio and video support
- ✓Prioritize lightweight, low-latency deployment across broad multimodal tasks
Verdict
GPT-5.1-Codex-Mini leads on intelligence (38.6 vs 19.4) and measured output speed while offering strong coding specialization and native image+text support. Gemini 2.5 Flash Lite Preview 09-2025 leads on price ($0.4 vs $2 per 1M tokens), context size (1,048,576 vs 400,000 tokens), and breadth of native modalities including audio and video. The choice hinges on whether the workload prioritizes coding depth and speed or cost-efficient high-volume multimodal throughput.
Gemini 2.5 Flash Lite Preview 09-2025 vs GPT-5.1-Codex-Mini: side by side
| Spec | Gemini 2.5 Flash Lite Preview 09-2025 | GPT-5.1-Codex-Mini | Winner |
|---|---|---|---|
| Intelligence | 19.4 | 38.6 | GPT-5.1-Codex-Mini |
| Output speed | — | 215 t/s | Tie |
| Output price | $0.40/1M | $2.00/1M | Gemini 2.5 Flash Lite Preview 09-2025 |
| Context | 1049K | 400K | Gemini 2.5 Flash Lite Preview 09-2025 |
| 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 with 19.4 for Gemini 2.5 Flash Lite Preview 09-2025. This gap aligns with its coding specialization and suitability for extended technical workflows.
Pricing
Winner: Gemini 2.5 Flash Lite Preview 09-2025Gemini 2.5 Flash Lite Preview 09-2025 costs $0.4 per million output tokens while GPT-5.1-Codex-Mini costs $2 per million. The five-fold price difference favors Gemini for cost-sensitive, high-volume workloads.
Context & Speed
Winner: TieGemini 2.5 Flash Lite Preview 09-2025 offers a larger 1,048,576-token context versus 400,000 tokens. GPT-5.1-Codex-Mini reports a concrete speed of 214.62 t/s while Gemini speed is unspecified, creating an incomplete comparison on latency.
Multimodal Support
Winner: Gemini 2.5 Flash Lite Preview 09-2025Gemini 2.5 Flash Lite Preview 09-2025 natively handles text, image, audio, and video. GPT-5.1-Codex-Mini is limited to image and text, though it adds explicit coding specialization.
Gemini 2.5 Flash Lite Preview 09-2025
Pros
- +Optimized for speed and low latency
- +Handles very large context windows
- +Broad native multimodal support
- +Lightweight deployment suitable for high-volume use
Cons
- –Preview model may show inconsistent behavior
- –Reduced capability depth versus full Gemini variants
- –Lite design trades off some advanced reasoning performance
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 2.5 Flash Lite Preview 09-2025 vs GPT-5.1-Codex-Mini
Select GPT-5.1-Codex-Mini when coding performance and measured speed matter most. Choose Gemini 2.5 Flash Lite Preview 09-2025 when lowest cost, largest context, and broadest multimodal coverage are required.
Frequently asked questions
GPT-5.1-Codex-Mini is stronger on intelligence and coding tasks; Gemini 2.5 Flash Lite Preview 09-2025 is stronger on price and modality breadth.