Data points: 81
The readout for GPT-5.3 Codex and GPT-5.4 Mini, before the detailed comparison sheet.
Decision read
GPT-5.4 Mini
GPT-5.4 Mini currently has the stronger profile, with verified wins split 2 to 4.
Evidence depth
81 data points
Includes 8 benchmark rows, 0 audit samples, and 7 provider examples.
Selection signal
Start with GPT-5.4 Mini
The charts below split 15 high-signal samples across speed, scores, and audit health.
Model compare GPT-5.3 Codex vs GPT-5.4 Minigpt-5-3-codex-vs-gpt-5-4-mini | Model A GPT-5.3 Codex | Model B GPT-5.4 Mini |
|---|---|---|
| Overall leader | Contender | Leading |
| Verified metric wins | 2 wins | 4 wins |
| Where it leads | Provider coverage, Recent tests | Cheapest input price, Average speed, First-token latency, Free providers |
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
| Metric | GPT-5.3 Codex | GPT-5.4 Mini |
|---|---|---|
| GPQA | 91.5%#4 |
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.3 Codex | GPT-5.4 Mini |
|---|---|---|
| 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 | GPT-5.3 Codex | GPT-5.4 Mini |
|---|---|---|
40 tests | GPT-5.3 Codex speed / latency 38 tok/s / 4553ms input / output No data |
This report only uses LMSpeed data for GPT-5.3 Codex and GPT-5.4 Mini: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | GPT-5.3 Codex | GPT-5.4 Mini |
|---|---|---|
| When to choose each model | GPT-5.3 Codex GPT-5.3 Codex is stronger when you prioritize Provider coverage, Recent tests. | GPT-5.4 Mini GPT-5.4 Mini is stronger when you prioritize Cheapest input price, Average speed, First-token latency, Free providers. |
TL;DR: GPT-5.4 Mini leads across 81 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from GPT-5.3 Codex vs GPT-5.4 Mini into nearby model comparisons with enough verified LMSpeed data.
| Model metadata | GPT-5.3 Codex exposes 400K tokens; notable signals: Text input, Image input, File input, Text output. | GPT-5.4 Mini exposes 400K tokens; notable signals: Text input, Image input, File input, Text output. |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Context window | 400K tokens | 400K tokens |
| Max output | 128K tokens | 128K tokens |
| Released | Feb 2026 | Mar 2026 |
| Modalities | Input TextImageFile Output Text | Input FileImageText Output Text |
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON mode |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | No data | 2025-08-31 |
| OpenRouter ID | openai/gpt-5.3-codex | openai/gpt-5.4-mini |
| References | No data | No data |
| HLE | 39.9%#5 | 26.6%#23 |
|---|
| SciCode | 53.2%#8 | 49.9%#13 |
|---|
| Output speed | 77.7 tok/s#66 | 165.0 tok/s#22 |
|---|
| Input price | $1.75/M#35 | $0.750/M#24 |
|---|
| Output price | $14.00/M#43 | $4.50/M#34 |
|---|
| Time to first answer token | 57.06 s#95 | 3.95 s#47 |
|---|
| Blended price | $4.81/M#62 | $1.69/M#48 |
|---|
GPT-5.4 Mini
speed / latency
223 tok/s / 3411ms
input / output
No data
XShuLab Sub2API30 tests | GPT-5.3 Codex gpt-5.3-codex-openai-compact speed / latency 21 tok/s / 1485ms input / output $0.0005/M / $0.0038/M | GPT-5.4 Mini gpt-5.4-mini speed / latency 139 tok/s / 2844ms input / output $0.0002/M / $0.0012/M |
|---|
UoCode25 tests | GPT-5.3 Codex speed / latency 56 tok/s / 4621ms input / output No data | GPT-5.4 Mini speed / latency N/A / N/A input / output No data |
|---|
Mars HK19 tests | GPT-5.3 Codex speed / latency 252 tok/s / 2196ms input / output No data | GPT-5.4 Mini speed / latency 145 tok/s / 5776ms input / output No data |
|---|
Mars HK15 tests | GPT-5.3 Codex speed / latency N/A / N/A input / output No data | GPT-5.4 Mini speed / latency 128 tok/s / 4452ms input / output No data |
|---|
GPT-5.3 Codex gpt-5.3-codex-openai-compact speed / latency No data input / output $75.00/M / $600.00/M | GPT-5.4 Mini gpt-5.4-mini speed / latency No data input / output $0/M / $0/M |
GPT-5.3 Codex gpt-5.3-codex-spark speed / latency No data input / output $0.182/M / $0.182/M | GPT-5.4 Mini gpt-5.4-mini speed / latency No data input / output $0.0073/M / $0.0073/M |
Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.
