Data points: 44
The readout for DeepSeek V4 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 1 to 5.
Evidence depth
44 data points
Includes 0 benchmark rows, 0 audit samples, and 6 provider examples.
Selection signal
Start with GPT-5.3 Codex
The charts below split 6 high-signal samples across speed, scores, and audit health.
Model compare DeepSeek V4 vs GPT-5.3 Codexdeepseek-v4-vs-gpt-5-3-codex | Model A DeepSeek V4 | Model B GPT-5.3 Codex |
|---|---|---|
| Overall leader | Contender | Leading |
| Verified metric wins | 1 wins | 5 wins |
| Where it leads | First-token latency | Cheapest input price, Average speed, Free providers, Provider coverage, Recent tests |
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
| Metric | DeepSeek V4 | 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 | DeepSeek V4 | 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 | DeepSeek V4 | GPT-5.3 Codex |
|---|---|---|
10 tests | DeepSeek V4 speed / latency 47 tok/s / 2487ms input / output No data |
This report only uses LMSpeed data for DeepSeek V4 and GPT-5.3 Codex: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | DeepSeek V4 | GPT-5.3 Codex |
|---|---|---|
| When to choose each model | DeepSeek V4 DeepSeek V4 is stronger when you prioritize First-token latency. | GPT-5.3 Codex GPT-5.3 Codex is stronger when you prioritize Cheapest input price, Average speed, Free providers, Provider coverage, Recent tests. |
TL;DR: GPT-5.3 Codex leads across 44 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from DeepSeek V4 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 | DeepSeek | 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
speed / latency
N/A / N/A
input / output
No data
Seamee API5 tests | DeepSeek V4 deepseek-v4-lite speed / latency N/A / N/A input / output $75.00/M / $75.00/M | GPT-5.3 Codex GPT-5.3-CodeX speed / latency 53 tok/s / 3889ms input / output $75.00/M / $75.00/M |
|---|
3173721 API0 tests | DeepSeek V4 speed / latency N/A / N/A input / output No data | GPT-5.3 Codex speed / latency N/A / N/A input / output No data |
|---|
CookingAI0 tests | DeepSeek V4 speed / latency N/A / N/A input / output No data | GPT-5.3 Codex speed / latency N/A / N/A input / output No data |
|---|
KFCV500 tests | DeepSeek V4 speed / latency N/A / N/A input / output No data | GPT-5.3 Codex speed / latency N/A / N/A input / output No data |
|---|
DeepSeek V4 deepseek-v4 speed / latency No data input / output $0.050/M / $0.050/M | GPT-5.3 Codex gpt-5.3-codex speed / latency No data input / output $6.00/M / $48.00/M |
Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.
