Data points: 54
The readout for Gemini Flash Lite and GPT-5.3 Codex, before the detailed comparison sheet.
Decision read
GPT-5.3 Codex
GPT-5.3 Codex currently has the stronger profile, with verified wins split 0 to 4.
Evidence depth
54 data points
Includes 0 benchmark rows, 0 audit samples, and 8 provider examples.
Selection signal
Start with GPT-5.3 Codex
The charts below split 8 high-signal samples across speed, scores, and audit health.
Model compare Gemini Flash Lite vs GPT-5.3 Codexgemini-flash-lite-vs-gpt-5-3-codex | Model A Gemini Flash Lite | Model B GPT-5.3 Codex |
|---|---|---|
| Overall leader | Contender | Leading |
| Verified metric wins | 0 wins | 4 wins |
| Where it leads | No data | Cheapest input price, Free providers, Provider coverage, Recent tests |
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
| Metric | Gemini Flash Lite | GPT-5.3 Codex |
|---|---|---|
| No shared benchmark metrics are available yet. | ||
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Gemini Flash Lite | GPT-5.3 Codex |
|---|---|---|
| No completed audits are available from shared providers yet. | ||
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | Gemini Flash Lite | GPT-5.3 Codex |
|---|---|---|
25 tests | Gemini Flash Lite gemini-flash-lite speed / latency N/A / N/A input / output $0.014/M / $0.137/M |
This report only uses LMSpeed data for Gemini Flash Lite and GPT-5.3 Codex: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | Gemini Flash Lite | GPT-5.3 Codex |
|---|---|---|
| When to choose each model | Gemini Flash Lite Gemini Flash Lite does not clearly lead on the verified metrics here, so check provider-specific pricing before choosing. | GPT-5.3 Codex GPT-5.3 Codex is stronger when you prioritize Cheapest input price, Free providers, Provider coverage, Recent tests. |
TL;DR: GPT-5.3 Codex leads across 54 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from Gemini Flash Lite vs GPT-5.3 Codex into nearby model comparisons with enough verified LMSpeed data.
| Model metadata | No OpenRouter metadata is available yet for this model. | GPT-5.3 Codex exposes 400K tokens; notable signals: Text input, Image input, File input, Text output. |
|---|---|---|
| Developer | OpenAI | |
| Context window | No data | 400K tokens |
| Max output | No data | 128K tokens |
| Released | No data | Feb 2026 |
| Modalities | No data | Input TextImageFile Output Text |
| Features | None listed | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
| Parameters | No data | No data |
| Tokenizer | No data | GPT |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | No data | openai/gpt-5.3-codex |
| References | No data | No data |
GPT-5.3 Codex
gpt-5.3-codex
speed / latency
56 tok/s / 4621ms
input / output
$0.274/M / $2.19/M
Seamee API5 tests | Gemini Flash Lite speed / latency N/A / N/A input / output No data | GPT-5.3 Codex speed / latency 53 tok/s / 3889ms input / output No data |
|---|
AAAI0 tests | Gemini Flash Lite speed / latency N/A / N/A input / output No data | GPT-5.3 Codex speed / latency N/A / N/A input / output No data |
|---|
AASS API0 tests | Gemini Flash Lite speed / latency N/A / N/A input / output No data | GPT-5.3 Codex speed / latency N/A / N/A input / output No data |
|---|
Aitoke0 tests | Gemini Flash Lite gemini-flash-lite speed / latency N/A / N/A input / output $0.014/M / $0.137/M | GPT-5.3 Codex gpt-5.3-codex speed / latency N/A / N/A input / output $0.274/M / $2.19/M |
|---|
Gemini Flash Lite gemini-flash-lite-latest speed / latency No data input / output $0.0041/M / $0.016/M | GPT-5.3 Codex gpt-5.3-codex-xhigh speed / latency No data input / output $0.072/M / $0.575/M |
Gemini Flash Lite gemini-flash-lite-latest speed / latency No data input / output $0.014/M / $0.055/M | GPT-5.3 Codex gpt-5.3-codex speed / latency No data input / output $0.240/M / $1.92/M |
Gemini Flash Lite gemini-flash-lite-latest speed / latency No data input / output $0.014/M / $0.055/M | GPT-5.3 Codex gpt-5.3-codex-spark speed / latency No data input / output $10.27/M / $10.27/M |
Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.
