Data points: 116
Model compare
The readout for GPT-5.2 and GPT-5.3 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 36 to 64.
Evidence depth
116 data points
Includes 26 benchmark rows, 0 audit samples, and 7 provider examples.
Selection signal
Start with GPT-5.3 Codex
The charts below split 33 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-5.2 and GPT-5.3 Codex: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5.2 | GPT-5.3 Codex |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 36.0 pts | 64.0 pts |
| Benchmark category leads | 1 categories | 3 categories |
| Operational advantages | Cheapest input price, First-token latency, Free providers | Average speed, Provider coverage |
| Context window | 400K tokens | 400K tokens |
| Max output | 128K tokens | 128K tokens |
| Modalities | Input FileImageText 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-5.2 | GPT-5.3 Codex |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Dec 2025 | Feb 2026 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | openai/gpt-5.2 | openai/gpt-5.3-codex |
| References | No data | 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.
GPT-5.2
GPT-5.2 is stronger in benchmark categories (Knowledge) and operational dimensions (Cheapest input price, First-token latency, Free providers).
GPT-5.3 Codex
GPT-5.3 Codex is stronger in benchmark categories (Agents, Coding, Reasoning) and operational dimensions (Average speed, Provider coverage).
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-5.2
52.9
Avg. score
GPT-5.3 Codex
56.5
GPT-5.3 Codex leads by 5.0
GPT-5.3 Codex leads by 2.3
GPT-5.3 Codex leads by 5.9
GPT-5.2 leads by 1.9
GPT-5.2
No data
GPT-5.2
Tied
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5.2
53.0
Rank #50/84 · confidence 3 · eval date 2025-12-11
GPT-5.3 Codex
winner64.0
Rank #22/84 · confidence 1 · eval date 2026-02-05
GPT-5.2
$1.75/M
Rank #120/162 · confidence 4
GPT-5.3 Codex
$1.75/M
Rank #120/162 · confidence 4
GPT-5.2
$4.81/M
Rank #132/162 · confidence 4
GPT-5.3 Codex
$4.81/M
Rank #132/162 · confidence 4
GPT-5.2
$14.00/M
Rank #133/162 · confidence 4
GPT-5.3 Codex
$14.00/M
Rank #133/162 · confidence 4
GPT-5.2
72.7
Rank #13/89 · confidence 3 · eval date 2025-12-11
GPT-5.3 Codex
winner74.0
Rank #6/89 · confidence 1 · eval date 2026-02-05
GPT-5.2
71.2%
Rank #110/188 · confidence 4
GPT-5.3 Codex
winner91.5%
Rank #12/188 · confidence 4
GPT-5.2
11.6
Rank #20/73 · confidence 3 · eval date 2025-12-11
GPT-5.3 Codex
winner16.9
Rank #13/73 · confidence 1 · eval date 2026-02-05
GPT-5.2
7.3%
Rank #109/187 · confidence 4
GPT-5.3 Codex
winner39.9%
Rank #13/187 · confidence 4
GPT-5.2
53.5
Rank #6/33 · confidence 3 · eval date 2025-12-11
GPT-5.3 Codex
winner61.8
Rank #4/33 · confidence 1 · eval date 2026-02-05
GPT-5.2
80.0
Rank #12/43 · confidence 3 · eval date 2025-12-11
GPT-5.3 Codex
winner85.0
Rank #5/43 · confidence 1 · eval date 2026-02-05
GPT-5.2
40.4%
Rank #64/185 · confidence 4
GPT-5.3 Codex
winner53.2%
Rank #11/185 · confidence 4
GPT-5.2
52.1
Rank #18/96 · confidence 3 · eval date 2025-12-11
GPT-5.3 Codex
winner53.2
Rank #15/96 · confidence 1 · eval date 2026-02-05
GPT-5.2
52.2
Rank #34/65 · confidence 3 · eval date 2025-12-11
GPT-5.3 Codex
winner58.5
Rank #19/65 · confidence 1 · eval date 2026-02-05
GPT-5.2
55.6
Rank #25/37 · confidence 3 · eval date 2025-12-11
GPT-5.3 Codex
winner56.8
Rank #20/37 · confidence 1 · eval date 2026-02-05
GPT-5.2
43.8
Rank #16/90 · confidence 3 · eval date 2025-12-11
GPT-5.3 Codex
winner51.8
Rank #8/90 · confidence 1 · eval date 2026-02-05
GPT-5.2
35.4
Rank #21/96 · confidence 3 · eval date 2025-12-11
GPT-5.3 Codex
winner39.9
Rank #12/96 · confidence 1 · eval date 2026-02-05
GPT-5.2
90.3
Rank #19/96 · confidence 3 · eval date 2025-12-11
GPT-5.3 Codex
winner91.5
Rank #13/96 · confidence 1 · eval date 2026-02-05
GPT-5.2
42.2
Rank #22/99 · confidence 3 · eval date 2025-12-11
GPT-5.3 Codex
winner44.3
Rank #17/99 · confidence 1 · eval date 2026-02-05
GPT-5.2
79.7
Rank #39/90 · confidence 3 · eval date 2025-12-11
GPT-5.3 Codex
winner86.9
Rank #22/90 · confidence 1 · eval date 2026-02-05
GPT-5.2
winner1219.0
Rank #35/66 · confidence 3 · eval date 2025-12-11
GPT-5.3 Codex
1187.0
Rank #46/66 · confidence 1 · eval date 2026-02-05
GPT-5.2
75.4
Rank #21/86 · confidence 3 · eval date 2025-12-11
GPT-5.3 Codex
75.4
Rank #21/86 · confidence 1 · eval date 2026-02-05
GPT-5.2
winner34.3
Rank #7/20 · confidence 3 · eval date 2025-12-11
GPT-5.3 Codex
33.7
Rank #8/20 · confidence 1 · eval date 2026-02-05
GPT-5.2
46.5
Rank #29/50 · confidence 3 · eval date 2025-12-11
GPT-5.3 Codex
winner57.5
Rank #13/50 · confidence 1 · eval date 2026-02-05
GPT-5.2
47.3
Rank #20/21 · confidence 3 · eval date 2025-12-11
GPT-5.3 Codex
winner64.7
Rank #15/21 · confidence 1 · eval date 2026-02-05
GPT-5.2
22.0
Rank #48/53 · confidence 3 · eval date 2025-12-11
GPT-5.3 Codex
winner64.3
Rank #23/53 · confidence 1 · eval date 2026-02-05
GPT-5.2
84.8
Rank #44/84 · confidence 3 · eval date 2025-12-11
GPT-5.3 Codex
winner86.0
Rank #41/84 · confidence 1 · eval date 2026-02-05
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 | GPT-5.3 Codex speed / latency 38 tok/s / 4553ms input / output No data |
15 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 |
15 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 |
14 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 |
10 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-5.2-2025-12-11 speed / latency No data input / output $0/M/$0/M | GPT-5.3 Codex gpt-5.3-codex-spark speed / latency No data input / output $1.28/M | |
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 $0/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 inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
