Data points: 78
The readout for GPT-5.1 Codex and GPT-5.2, before the detailed comparison sheet.
Decision read
GPT-5.2
GPT-5.2 currently has the stronger profile, with verified wins split 0 to 3.
Evidence depth
78 data points
Includes 8 benchmark rows, 0 audit samples, and 9 provider examples.
Selection signal
Start with GPT-5.2
The charts below split 17 high-signal samples across speed, scores, and audit health.
Model compare GPT-5.1 Codex vs GPT-5.2gpt-5-1-codex-vs-gpt-5-2 | Model A GPT-5.1 Codex | Model B GPT-5.2 |
|---|---|---|
| Overall leader | Contender | Leading |
| Verified metric wins | 0 wins | 3 wins |
| Where it leads | No data | Cheapest input price, Provider coverage, Recent tests |
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
| Metric | GPT-5.1 Codex | GPT-5.2 |
|---|---|---|
| LiveCodeBench | 84.9%#10 |
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.1 Codex | GPT-5.2 |
|---|---|---|
| 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-5.1 Codex | GPT-5.2 |
|---|---|---|
15 tests | GPT-5.1 Codex speed / latency N/A / N/A input / output No data | GPT-5.2 |
This report only uses LMSpeed data for GPT-5.1 Codex and GPT-5.2: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | GPT-5.1 Codex | GPT-5.2 |
|---|---|---|
| When to choose each model | GPT-5.1 Codex GPT-5.1 Codex does not clearly lead on the verified metrics here, so check provider-specific pricing before choosing. | GPT-5.2 GPT-5.2 is stronger when you prioritize Cheapest input price, Provider coverage, Recent tests. |
TL;DR: GPT-5.2 leads across 78 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from GPT-5.1 Codex vs GPT-5.2 into nearby model comparisons with enough verified LMSpeed data.
| Model metadata | GPT-5.1 Codex exposes 400K tokens; notable signals: Text input, Image input, Text output, Tool calling. | GPT-5.2 exposes 128K tokens; notable signals: Text input, Image input, File input, Text output. |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Context window | 400K tokens | 128K tokens |
| Max output | 128K tokens | 16.4K tokens |
| Released | Nov 2025 | Dec 2025 |
| Modalities | Input TextImage Output Text | Input FileImageText Output Text |
| Features | Text inputImage 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 | No data |
| OpenRouter ID | openai/gpt-5.1-codex | openai/gpt-5.2-chat |
| References | No data | No data |
| MMLU-Pro | 86.0%#13 | 87.4%#6 |
|---|
| GPQA | 86.0%#26 | 90.3%#9 |
|---|
| HLE | 23.4%#33 | 35.4%#9 |
|---|
| SciCode | 40.2%#46 | 52.1%#9 |
|---|
| Output speed | 185.7 tok/s#15 | 72.8 tok/s#71 |
|---|
| Input price | $1.25/M#30 | $1.75/M#35 |
|---|
| Output price | $10.00/M#41 | $14.00/M#43 |
|---|
speed / latency
56 tok/s / 1798ms
input / output
No data
星见雅 API15 tests | GPT-5.1 Codex speed / latency N/A / N/A input / output No data | GPT-5.2 speed / latency 52 tok/s / 2671ms input / output No data |
|---|
BUZZ5 tests | GPT-5.1 Codex speed / latency N/A / N/A input / output No data | GPT-5.2 speed / latency 64 tok/s / 3553ms input / output No data |
|---|
Feng Love API5 tests | GPT-5.1 Codex speed / latency N/A / N/A input / output No data | GPT-5.2 speed / latency 65 tok/s / 4770ms input / output No data |
|---|
Rnglg2 API5 tests | GPT-5.1 Codex speed / latency N/A / N/A input / output No data | GPT-5.2 speed / latency 55 tok/s / 1434ms input / output No data |
|---|
GPT-5.1 Codex gpt-5.1-codex speed / latency No data input / output $0/M / $0/M | GPT-5.2 gpt-5.2-openai-compact speed / latency No data input / output $75.00/M / $600.00/M |
GPT-5.1 Codex gpt-5.1-codex speed / latency No data input / output $0.029/M / $0.235/M | GPT-5.2 gpt-5.2 speed / latency No data input / output $0.0068/M / $0.055/M |
GPT-5.1 Codex gpt-5.1-codex speed / latency No data input / output $0.010/M / $0.010/M | GPT-5.2 gpt-5.2 speed / latency No data input / output $0.010/M / $0.010/M |
GPT-5.1 Codex gpt-5.1-codex-high speed / latency No data input / output $0.014/M / $0.014/M | GPT-5.2 gpt-5.2-openai-compact 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.
