Data points: 111
Model compare
The readout for GPT-5.2 Codex and GPT-5.4, before the detailed comparison sheet.
Weighted outcome: GPT-5.4. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.4
GPT-5.4 has the higher weighted result; Model A / B score 40 to 60.
Evidence depth
111 data points
Includes 21 benchmark rows, 1 audit samples, and 7 provider examples.
Selection signal
Start with GPT-5.4
The charts below split 29 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 Codex and GPT-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5.2 Codex | GPT-5.4 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 40.0 pts | 60.0 pts |
| Benchmark category leads | 2 categories | 3 categories |
| Operational advantages | Average speed, First-token latency | Cheapest input price, Free providers, Provider coverage |
| Context window | 400K tokens | 1.1M tokens |
| Max output | 128K tokens | 128K tokens |
| Modalities | Input TextImage 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 Codex | GPT-5.4 |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Jan 2026 | Mar 2026 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | openai/gpt-5.2-codex | openai/gpt-5.4 |
| References | No data | No data |
This report only uses LMSpeed data for GPT-5.2 Codex and GPT-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5.2 Codex
GPT-5.2 Codex is stronger in benchmark categories (Reasoning, Instruction following) and operational dimensions (Average speed, First-token latency).
GPT-5.4
GPT-5.4 is stronger in benchmark categories (Agents, Coding, Knowledge) and operational dimensions (Cheapest input price, Free providers, 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 Codex
55.5
Avg. score
GPT-5.4
57.4
GPT-5.4 leads by 4.8
GPT-5.4 leads by 4.6
GPT-5.2 Codex leads by 3.0
GPT-5.4 leads by 8.1
GPT-5.4
No data
GPT-5.4
GPT-5.2 Codex leads by 1.5
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5.2 Codex
winner$1.75/M
Rank #120/162 · confidence 4
GPT-5.4
$2.50/M
Rank #131/162 · confidence 4
GPT-5.2 Codex
winner$4.81/M
Rank #132/162 · confidence 4
GPT-5.4
$5.63/M
Rank #135/162 · confidence 4
GPT-5.2 Codex
winner$14.00/M
Rank #133/162 · confidence 4
GPT-5.4
$15.00/M
Rank #136/162 · confidence 4
GPT-5.2 Codex
winner75.7
Rank #1/89 · confidence 1 · eval date 2025-12-18
GPT-5.4
74.0
Rank #6/89 · confidence 3 · eval date 2026-03-05
GPT-5.2 Codex
8.7
Rank #26/73 · confidence 1 · eval date 2025-12-18
GPT-5.4
winner23.4
Rank #7/73 · confidence 3 · eval date 2026-03-05
GPT-5.2 Codex
winner89.9%
Rank #21/188 · confidence 4
GPT-5.4
74.8%
Rank #96/188 · confidence 4
GPT-5.2 Codex
winner33.5%
Rank #24/187 · confidence 4
GPT-5.4
10.6%
Rank #91/187 · confidence 4
GPT-5.2 Codex
37.9
Rank #11/33 · confidence 1 · eval date 2025-12-18
GPT-5.4
winner67.4
Rank #3/33 · confidence 3 · eval date 2026-03-05
GPT-5.2 Codex
54.6
Rank #8/96 · confidence 1 · eval date 2025-12-18
GPT-5.4
winner56.6
Rank #4/96 · confidence 3 · eval date 2026-03-05
GPT-5.2 Codex
winner54.6%
Rank #6/185 · confidence 4
GPT-5.4
47.1%
Rank #24/185 · confidence 4
GPT-5.2 Codex
winner59.2
Rank #17/65 · confidence 1 · eval date 2025-12-18
GPT-5.4
42.4
Rank #53/65 · confidence 3 · eval date 2026-03-05
GPT-5.2 Codex
33.5
Rank #24/96 · confidence 1 · eval date 2025-12-18
GPT-5.4
winner41.6
Rank #8/96 · confidence 3 · eval date 2026-03-05
GPT-5.2 Codex
40.7
Rank #20/90 · confidence 1 · eval date 2025-12-18
GPT-5.4
winner50.0
Rank #9/90 · confidence 3 · eval date 2026-03-05
GPT-5.2 Codex
40.1
Rank #29/99 · confidence 1 · eval date 2025-12-18
GPT-5.4
winner51.4
Rank #10/99 · confidence 3 · eval date 2026-03-05
GPT-5.2 Codex
89.9
Rank #22/96 · confidence 1 · eval date 2025-12-18
GPT-5.4
winner92.0
Rank #11/96 · confidence 3 · eval date 2026-03-05
GPT-5.2 Codex
72.8
Rank #53/90 · confidence 1 · eval date 2025-12-18
GPT-5.4
winner88.6
Rank #18/90 · confidence 3 · eval date 2026-03-05
GPT-5.2 Codex
76.3
Rank #22/57 · confidence 1 · eval date 2025-12-18
GPT-5.4
winner78.4
Rank #16/57 · confidence 3 · eval date 2026-03-05
GPT-5.2 Codex
winner77.6
Rank #8/86 · confidence 1 · eval date 2025-12-18
GPT-5.4
73.9
Rank #24/86 · confidence 3 · eval date 2026-03-05
GPT-5.2 Codex
51.8
Rank #19/50 · confidence 1 · eval date 2025-12-18
GPT-5.4
winner64.9
Rank #4/50 · confidence 3 · eval date 2026-03-05
GPT-5.2 Codex
26.0
Rank #12/20 · confidence 1 · eval date 2025-12-18
GPT-5.4
winner38.9
Rank #4/20 · confidence 3 · eval date 2026-03-05
GPT-5.2 Codex
winner92.1
Rank #30/84 · confidence 1 · eval date 2025-12-18
GPT-5.4
87.1
Rank #37/84 · confidence 3 · eval date 2026-03-05
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.2 Codex | GPT-5.4 |
|---|---|---|
Winner: GPT-5.4 | GPT-5.2 Codex gpt-5.2-codex No audit yet | GPT-5.4 gpt-5.4 Audit score 93 1008486100 |
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | GPT-5.2 Codex | GPT-5.4 |
|---|---|---|
100 tests | GPT-5.2 Codex speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 57 tok/s / 3556ms input / output No data |
50 tests | GPT-5.2 Codex speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 50 tok/s / 7305ms input / output No data |
44 tests | GPT-5.2 Codex speed / latency 67 tok/s / 4708ms input / output No data | GPT-5.4 speed / latency 43 tok/s / 12778ms input / output No data |
20 tests | GPT-5.2 Codex speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 51 tok/s / 4032ms input / output No data |
20 tests | GPT-5.2 Codex speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 34 tok/s / 1748ms input / output No data |
GPT-5.2 Codex gpt-5.2-codex speed / latency No data input / output $0/request | GPT-5.4 gpt-5.4 speed / latency No data input / output $0/request | |
GPT-5.2 Codex gpt-5.2-codex-medium speed / latency No data input / output $0.0068/request | GPT-5.4 gpt-5.4-openai-compact speed / latency No data input / output $4.11/M |
Weighted outcome: GPT-5.4. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Output
| Features | Text inputImage inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
