Data points: 85
The readout for GPT-5.3 Codex and GPT-5.4, before the detailed comparison sheet.
Decision read
Tie
Tie currently has the stronger profile, with verified wins split 3 to 3.
Evidence depth
85 data points
Includes 8 benchmark rows, 1 audit samples, and 8 provider examples.
Selection signal
Tie
The charts below split 17 high-signal samples across speed, scores, and audit health.
Model compare GPT-5.3 Codex vs GPT-5.4gpt-5-3-codex-vs-gpt-5-4 | Model A GPT-5.3 Codex | Model B GPT-5.4 |
|---|---|---|
| Overall leader | Tie | Tie |
| Verified metric wins | 3 wins | 3 wins |
| Where it leads | Cheapest input price, Average speed, First-token latency | Free providers, Provider coverage, Recent tests |
| Model metadata | GPT-5.3 Codex exposes 400K tokens; notable signals: Text input, Image input, File input, Text output. | GPT-5.4 exposes 1.1M tokens; notable signals: Text input, Image input, File input, Text output. |
| Developer | OpenAI | OpenAI |
| Context window | 400K tokens | 1.1M tokens |
| Max output | 128K tokens | 128K tokens |
| Released | Feb 2026 | Mar 2026 |
| Modalities | Input TextImageFile Output Text | Input TextImageFile Output Text |
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | openai/gpt-5.3-codex | openai/gpt-5.4 |
| References | No data | No data |
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
| Metric | GPT-5.3 Codex | GPT-5.4 |
|---|---|---|
| GPQA | 91.5%#4 | 92.0%#3 |
| SciCode | 53.2%#8 | 56.6%#3 |
| HLE | 39.9%#5 | 41.6%#4 |
| Input price | $1.75/M#35 | $2.50/M#37 |
| Output price | $14.00/M#43 | $15.00/M#44 |
| Output speed | 77.7 tok/s#66 | 92.4 tok/s#56 |
| Blended price | $4.81/M#62 | $5.63/M#63 |
| Time to first answer token | 57.06 s#95 | 134.24 s#111 |
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.3 Codex | GPT-5.4 |
|---|---|---|
钠 APIWinner: GPT-5.4 | GPT-5.3 Codex gpt-5.3-codex-spark No audit yet | GPT-5.4 gpt-5.4 Audit score 90 1008476100 |
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 |
|---|---|---|
Mars HK125 tests | GPT-5.3 Codex speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 49 tok/s / 6084ms input / output No data |
Mars HK114 tests | GPT-5.3 Codex speed / latency 252 tok/s / 2196ms input / output No data | GPT-5.4 speed / latency 57 tok/s / 3556ms input / output No data |
星见雅 API55 tests | GPT-5.3 Codex speed / latency 38 tok/s / 4553ms input / output No data | GPT-5.4 speed / latency 49 tok/s / 5435ms input / output No data |
天宫造物50 tests | GPT-5.3 Codex speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 50 tok/s / 7305ms input / output No data |
QuicklyAPI35 tests | GPT-5.3 Codex speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 50 tok/s / 2467ms input / output No data |
GPT-5.3 Codex gpt-5.3-codex speed / latency No data input / output $0/M / $0/M | GPT-5.4 gpt-5.4-openai-compact speed / latency No data input / output $75.00/M / $450.00/M | |
GPT-5.3 Codex gpt-5.3-codex-openai-compact speed / latency No data input / output $0.0005/M / $0.0038/M | GPT-5.4 gpt-5.4-openai-compact speed / latency No data input / output $0.0007/M / $0.0041/M | |
GPT-5.3 Codex gpt-5.3-codex-spark speed / latency No data input / output $75.00/M / $600.00/M | GPT-5.4 gpt-5.4 speed / latency No data input / output $0.010/M / $0.010/M |
This report only uses LMSpeed data for GPT-5.3 Codex and GPT-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | GPT-5.3 Codex | GPT-5.4 |
|---|---|---|
| When to choose each model | GPT-5.3 Codex GPT-5.3 Codex is stronger when you prioritize Cheapest input price, Average speed, First-token latency. | GPT-5.4 GPT-5.4 is stronger when you prioritize Free providers, Provider coverage, Recent tests. |
TL;DR: Tie leads across 85 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from GPT-5.3 Codex vs GPT-5.4 into nearby model comparisons with enough verified LMSpeed data.
Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.
