Key Takeaways
Gemini 3.1 Flash Lite Preview wins:
- Cheaper input tokens
- Cheaper output tokens
- Larger context window
GPT-5.3 Codex wins:
- Faster response time
- Higher intelligence benchmark
- Better at coding
Price Advantage
Gemini 3.1 Flash Lite Preview
Benchmark Advantage
GPT-5.3 Codex
Context Window
Gemini 3.1 Flash Lite Preview
Speed
GPT-5.3 Codex
Pricing Comparison
Price Comparison
| Metric | Gemini 3.1 Flash Lite Preview | GPT-5.3 Codex | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $0.25 | $1.75 | Gemini 3.1 Flash Lite Preview |
| Output (per 1M tokens) | $1.50 | $14.00 | Gemini 3.1 Flash Lite Preview |
| Cache Read (per 1M) | $0.03 | $0.17 | Gemini 3.1 Flash Lite Preview |
| Cache Write (per 1M) | $0.08 | N/A | Gemini 3.1 Flash Lite Preview |
Using a 3:1 input/output ratio, Gemini 3.1 Flash Lite Preview is 88% cheaper overall.
Gemini 3.1 Flash Lite Preview Providers
No provider data available
GPT-5.3 Codex Providers
No provider data available
Benchmark Comparison
3
Benchmarks Compared
0
Gemini 3.1 Flash Lite Preview Wins
0
GPT-5.3 Codex Wins
Benchmark Scores
| Benchmark | Gemini 3.1 Flash Lite Preview | GPT-5.3 Codex | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | - | 54.0 | - |
Coding Index Code generation & understanding | - | 53.1 | - |
GPQA Graduate-level science | - | 91.5 | - |
GPT-5.3 Codex significantly outperforms in coding benchmarks.
Cost vs Quality
X-axis:
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Other models
Context & Performance
Context Window
Gemini 3.1 Flash Lite Preview
1,048,576
tokens
GPT-5.3 Codex
400,000
tokens
Gemini 3.1 Flash Lite Preview has a 62% larger context window.
Speed Performance
| Metric | Gemini 3.1 Flash Lite Preview | GPT-5.3 Codex | Winner |
|---|---|---|---|
| Tokens/second | N/A | 68.3 tok/s | |
| Time to First Token | N/A | 81.66s |
Capabilities
Feature Comparison
| Feature | Gemini 3.1 Flash Lite Preview | GPT-5.3 Codex |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | Gemini 3.1 Flash Lite Preview | GPT-5.3 Codex |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | OpenAI | |
| Released | Mar 2026 | Feb 2026 |
Gemini 3.1 Flash Lite Preview Modalities
Input
textimagevideofileaudio
Output
text
GPT-5.3 Codex Modalities
Input
textimage
Output
text