Data points: 77
Model compare
The readout for GPT-5.3 Codex and GPT-5 Codex, before the detailed comparison sheet.
Weighted outcome: GPT-5.3 Codex. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.3 Codex
GPT-5.3 Codex has the higher weighted result; Model A / B score 88 to 12.
Evidence depth
77 data points
Includes 6 benchmark rows, 0 audit samples, and 7 provider examples.
Selection signal
Start with GPT-5.3 Codex
The charts below split 13 high-signal samples across speed, scores, and audit health.
Switch either side of this report to compare another model with the same LMSpeed data pipeline.
Select a different model to open a new comparison URL.
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.
| Model compare | GPT-5.3 Codex | GPT-5 Codex |
|---|---|---|
| Overall leader | Leading | Contender |
| Weighted overall score | 88.0 pts | 12.0 pts |
| Benchmark category leads | 2 categories | 0 categories |
| Operational advantages | Free providers, Provider coverage | Cheapest input price, Average speed, First-token latency |
| Context window | 400K tokens | 400K tokens |
| Max output | 128K tokens | 128K tokens |
| Modalities | Input TextImageFile Output Text | Input |
The overall result weights benchmark capability categories at 80% and price, API speed/latency, and availability at 20%. Recent test volume does not affect the winner, and missing benchmark categories are excluded.
| Model compare | GPT-5.3 Codex | GPT-5 Codex |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Feb 2026 | Sep 2025 |
| 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 |
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.
GPT-5.3 Codex
GPT-5.3 Codex is stronger in benchmark categories (Coding, Reasoning) and operational dimensions (Free providers, Provider coverage).
GPT-5 Codex
GPT-5 Codex has these operational advantages: Cheapest input price, Average speed, First-token latency.
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.
Avg. score
GPT-5.3 Codex
56.5
Avg. score
GPT-5 Codex
56
GPT-5.3 Codex
GPT-5.3 Codex leads by 2.4
GPT-5.3 Codex leads by 3.5
GPT-5.3 Codex
GPT-5 Codex
No data
No data
GPT-5.3 Codex
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5.3 Codex
$1.75/M
Rank #120/162 · confidence 4
GPT-5 Codex
winner$1.25/M
Rank #107/162 · confidence 4
GPT-5.3 Codex
$4.81/M
Rank #132/162 · confidence 4
GPT-5 Codex
winner$3.44/M
Rank #117/162 · confidence 4
GPT-5.3 Codex
$14.00/M
Rank #133/162 · confidence 4
GPT-5 Codex
winner$10.00/M
Rank #120/162 · confidence 4
GPT-5.3 Codex
winner91.5%
Rank #12/188 · confidence 4
GPT-5 Codex
83.7%
Rank #56/188 · confidence 4
GPT-5.3 Codex
winner39.9%
Rank #13/187 · confidence 4
GPT-5 Codex
25.6%
Rank #43/187 · confidence 4
GPT-5.3 Codex
winner53.2%
Rank #11/185 · confidence 4
GPT-5 Codex
40.9%
Rank #59/185 · confidence 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 | GPT-5 Codex speed / latency N/A / N/A input / output No data |
10 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 |
5 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 |
5 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 |
5 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/request | GPT-5 Codex gpt-5-codex speed / latency No data input / output $0/request | |
GPT-5.3 Codex gpt-5.3-codex speed / latency No data input / output $0.0068/request | GPT-5 Codex gpt-5-codex-2025-09-15 speed / latency No data input / output $57.53/M |
Weighted outcome: GPT-5.3 Codex. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Output
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
