Data points: 80
The readout for GPT-5.2 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 3.
Evidence depth
80 data points
Includes 8 benchmark rows, 0 audit samples, and 9 provider examples.
Selection signal
Start with GPT-5.3 Codex
The charts below split 17 high-signal samples across speed, scores, and audit health.
Model compare GPT-5.2 vs GPT-5.3 Codexgpt-5-2-vs-gpt-5-3-codex | Model A GPT-5.2 | Model B GPT-5.3 Codex |
|---|---|---|
| Overall leader | Contender | Leading |
| Verified metric wins | 1 wins | 3 wins |
| Where it leads | First-token latency | Average speed, Provider coverage, Recent tests |
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
| Metric | GPT-5.2 | GPT-5.3 Codex |
|---|---|---|
| GPQA | 90.3%#9 |
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.2 | 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 | GPT-5.2 | GPT-5.3 Codex |
|---|---|---|
50 tests | GPT-5.2 speed / latency 52 tok/s / 2671ms input / output No data |
This report only uses LMSpeed data for GPT-5.2 and GPT-5.3 Codex: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | GPT-5.2 | GPT-5.3 Codex |
|---|---|---|
| When to choose each model | GPT-5.2 GPT-5.2 is stronger when you prioritize First-token latency. | GPT-5.3 Codex GPT-5.3 Codex is stronger when you prioritize Average speed, Provider coverage, Recent tests. |
TL;DR: GPT-5.3 Codex leads across 80 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from GPT-5.2 vs GPT-5.3 Codex into nearby model comparisons with enough verified LMSpeed data.
| Model metadata | GPT-5.2 exposes 128K tokens; notable signals: Text input, Image input, File input, Text output. | GPT-5.3 Codex exposes 400K tokens; notable signals: Text input, Image input, File input, Text output. |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Context window | 128K tokens | 400K tokens |
| Max output | 16.4K tokens | 128K tokens |
| Released | Dec 2025 | Feb 2026 |
| Modalities | Input FileImageText Output Text | Input TextImageFile Output Text |
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON mode | 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-5.2-chat | openai/gpt-5.3-codex |
| References | No data | No data |
| HLE | 35.4%#9 | 39.9%#5 |
|---|
| SciCode | 52.1%#9 | 53.2%#8 |
|---|
| Input price | $1.75/M#35 | $1.75/M#35 |
|---|
| Output price | $14.00/M#43 | $14.00/M#43 |
|---|
| Blended price | $4.81/M#62 | $4.81/M#62 |
|---|
| Output speed | 72.8 tok/s#71 | 77.7 tok/s#66 |
|---|
| Time to first answer token | 115.69 s#109 | 57.06 s#95 |
|---|
GPT-5.3 Codex
speed / latency
38 tok/s / 4553ms
input / output
No data
N1N15 tests | GPT-5.2 speed / latency 56 tok/s / 1798ms input / output No data | GPT-5.3 Codex speed / latency N/A / N/A input / output No data |
|---|
小水管 API15 tests | GPT-5.2 speed / latency 71 tok/s / 2893ms input / output No data | GPT-5.3 Codex speed / latency 201 tok/s / 2135ms input / output No data |
|---|
Mars HK14 tests | GPT-5.2 speed / latency N/A / N/A input / output No data | GPT-5.3 Codex speed / latency 252 tok/s / 2196ms input / output No data |
|---|
A310 tests | GPT-5.2 speed / latency 45 tok/s / 1716ms input / output No data | GPT-5.3 Codex speed / latency 46 tok/s / 2039ms input / output No data |
|---|
GPT-5.2 gpt-5.2 speed / latency No data input / output $0/M / $0/M | GPT-5.3 Codex gpt-5.3-codex-openai-compact speed / latency No data input / output $75.00/M / $600.00/M |
GPT-5.2 gpt-5.2-openai-compact speed / latency No data input / output $0.0005/M / $0.0038/M | GPT-5.3 Codex gpt-5.3-codex-openai-compact speed / latency No data input / output $0.0005/M / $0.0038/M |
GPT-5.2 gpt-5.2 speed / latency No data input / output $0.0027/M / $0.0027/M | GPT-5.3 Codex gpt-5.3-codex-xhigh speed / latency No data input / output $0.240/M / $1.92/M |
GPT-5.2 gpt-5.2-all speed / latency No data input / output $0.0068/M / $0.0068/M | GPT-5.3 Codex gpt-5.3-codex-medium speed / latency No data input / output $0.240/M / $1.92/M |
Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.
