Data points: 81
The readout for GPT-5.3 Codex and GPT-5 Codex, before the detailed comparison sheet.
Decision read
Tie
Tie currently has the stronger profile, with verified wins split 3 to 3.
Evidence depth
81 data points
Includes 8 benchmark rows, 0 audit samples, and 8 provider examples.
Selection signal
Tie
The charts below split 16 high-signal samples across speed, scores, and audit health.
Model compare GPT-5.3 Codex vs GPT-5 Codexgpt-5-3-codex-vs-gpt-5-codex | Model A GPT-5.3 Codex | Model B GPT-5 Codex |
|---|---|---|
| Overall leader | Tie | Tie |
| Verified metric wins | 3 wins | 3 wins |
| Where it leads | Cheapest input price, Provider coverage, Recent tests | 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 Codex |
|---|---|---|
| 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 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-5.3 Codex | GPT-5 Codex |
|---|---|---|
35 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 Codex: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | GPT-5.3 Codex | GPT-5 Codex |
|---|---|---|
| When to choose each model | GPT-5.3 Codex GPT-5.3 Codex is stronger when you prioritize Cheapest input price, Provider coverage, Recent tests. | GPT-5 Codex GPT-5 Codex is stronger when you prioritize Average speed, First-token latency, Free providers. |
TL;DR: Tie leads across 81 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from GPT-5.3 Codex vs GPT-5 Codex 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 Codex exposes 400K tokens; notable signals: Text input, Image input, Text output, Tool calling. |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Context window | 400K tokens | 400K tokens |
| Max output | 128K tokens | 128K tokens |
| Released | Feb 2026 | Sep 2025 |
| Modalities | Input TextImageFile Output Text | Input TextImage Output Text |
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputText outputTool callingStructured outputsJSON modeReasoning |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | No data | 2024-09-30 |
| OpenRouter ID | openai/gpt-5.3-codex | openai/gpt-5-codex |
| References | No data | No data |
| HLE | 39.9%#5 | 25.6%#27 |
|---|
| SciCode | 53.2%#8 | 40.9%#41 |
|---|
| Output speed | 77.7 tok/s#66 | 170.0 tok/s#19 |
|---|
| Input price | $1.75/M#35 | $1.25/M#30 |
|---|
| Output price | $14.00/M#43 | $10.00/M#41 |
|---|
| Blended price | $4.81/M#62 | $3.44/M#58 |
|---|
| Time to first answer token | 57.06 s#95 | 11.29 s#62 |
|---|
GPT-5 Codex
speed / latency
N/A / N/A
input / output
No data
QQ Code10 tests | GPT-5.3 Codex speed / latency 57 tok/s / 2985ms input / output No data | GPT-5 Codex speed / latency N/A / N/A input / output No data |
|---|
BUZZ5 tests | GPT-5.3 Codex speed / latency N/A / N/A input / output No data | GPT-5 Codex speed / latency 103 tok/s / 3303ms input / output No data |
|---|
Compute Token5 tests | GPT-5.3 Codex speed / latency 22 tok/s / 3141ms input / output No data | GPT-5 Codex speed / latency N/A / N/A input / output No data |
|---|
DuckCoding5 tests | GPT-5.3 Codex speed / latency 21 tok/s / 2445ms input / output No data | GPT-5 Codex speed / latency N/A / N/A input / output No data |
|---|
GPT-5.3 Codex gpt-5.3-codex speed / latency No data input / output $0/M / $0/M | GPT-5 Codex gpt-5-codex-openai-compact speed / latency No data input / output $75.00/M / $600.00/M |
GPT-5.3 Codex gpt-5.3-codex speed / latency No data input / output $0.010/M / $0.010/M | GPT-5 Codex gpt-5-codex speed / latency No data input / output $0.010/M / $0.010/M |
GPT-5.3 Codex gpt-5.3-codex-low speed / latency No data input / output $0.014/M / $0.014/M | GPT-5 Codex gpt-5-codex-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.
