Data points: 106
Model compare
The readout for GPT-5.1 Codex and GPT-5.2, before the detailed comparison sheet.
Weighted outcome: GPT-5.2. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.2
GPT-5.2 has the higher weighted result; Model A / B score 26.7 to 73.3.
Evidence depth
106 data points
Includes 22 benchmark rows, 0 audit samples, and 8 provider examples.
Selection signal
Start with GPT-5.2
The charts below split 30 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-5.1 Codex and GPT-5.2: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5.1 Codex | GPT-5.2 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 26.7 pts | 73.3 pts |
| Benchmark category leads | 2 categories | 4 categories |
| Operational advantages | No data | Cheapest input price, Free providers, Provider coverage |
| Context window | 400K tokens | 400K tokens |
| Max output | 128K tokens | 128K tokens |
| Modalities | Input TextImage Output Text | Input File |
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-5.1 Codex | GPT-5.2 |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Nov 2025 | Dec 2025 |
| 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 |
| References | No data | No data |
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.
GPT-5.1 Codex
GPT-5.1 Codex leads these benchmark categories: Agents, Reasoning.
GPT-5.2
GPT-5.2 is stronger in benchmark categories (Coding, Knowledge, Math, Instruction following) 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-5.1 Codex
52.4
Avg. score
GPT-5.2
52.8
GPT-5.1 Codex leads by 1.8
GPT-5.2 leads by 5.9
GPT-5.1 Codex leads by 1.6
GPT-5.2 leads by 5.9
GPT-5.2 leads by 2.1
No data
GPT-5.2
GPT-5.2 leads by 2.0
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5.1 Codex
winner$1.25/M
Rank #107/162 · confidence 4
GPT-5.2
$1.75/M
Rank #120/162 · confidence 4
GPT-5.1 Codex
winner$3.44/M
Rank #117/162 · confidence 4
GPT-5.2
$4.81/M
Rank #132/162 · confidence 4
GPT-5.1 Codex
winner$10.00/M
Rank #120/162 · confidence 4
GPT-5.2
$14.00/M
Rank #133/162 · confidence 4
GPT-5.1 Codex
67.3
Rank #31/89 · confidence 1 · eval date 2025-10-15
GPT-5.2
winner72.7
Rank #13/89 · confidence 3 · eval date 2025-12-11
GPT-5.1 Codex
5.7
Rank #30/73 · confidence 1 · eval date 2025-10-15
GPT-5.2
winner11.6
Rank #20/73 · confidence 3 · eval date 2025-12-11
GPT-5.1 Codex
winner86.0%
Rank #20/125 · confidence 4
GPT-5.2
81.4%
Rank #54/125 · confidence 4
GPT-5.1 Codex
winner86.0%
Rank #41/188 · confidence 4
GPT-5.2
71.2%
Rank #110/188 · confidence 4
GPT-5.1 Codex
winner23.4%
Rank #47/187 · confidence 4
GPT-5.2
7.3%
Rank #109/187 · confidence 4
GPT-5.1 Codex
13.1
Rank #28/33 · confidence 1 · eval date 2025-10-15
GPT-5.2
winner53.5
Rank #6/33 · confidence 3 · eval date 2025-12-11
GPT-5.1 Codex
winner84.9%
Rank #9/115 · confidence 4
GPT-5.2
66.9%
Rank #36/115 · confidence 4
GPT-5.1 Codex
40.2
Rank #56/96 · confidence 1 · eval date 2025-10-15
GPT-5.2
winner52.1
Rank #18/96 · confidence 3 · eval date 2025-12-11
GPT-5.1 Codex
40.2%
Rank #68/185 · confidence 4
GPT-5.2
winner40.4%
Rank #64/185 · confidence 4
GPT-5.1 Codex
39.2
Rank #23/90 · confidence 1 · eval date 2025-10-15
GPT-5.2
winner43.8
Rank #16/90 · confidence 3 · eval date 2025-12-11
GPT-5.1 Codex
86.0
Rank #40/96 · confidence 1 · eval date 2025-10-15
GPT-5.2
winner90.3
Rank #19/96 · confidence 3 · eval date 2025-12-11
GPT-5.1 Codex
23.4
Rank #45/96 · confidence 1 · eval date 2025-10-15
GPT-5.2
winner35.4
Rank #21/96 · confidence 3 · eval date 2025-12-11
GPT-5.1 Codex
34.7
Rank #46/99 · confidence 1 · eval date 2025-10-15
GPT-5.2
winner42.2
Rank #22/99 · confidence 3 · eval date 2025-12-11
GPT-5.1 Codex
74.4
Rank #47/90 · confidence 1 · eval date 2025-10-15
GPT-5.2
winner79.7
Rank #39/90 · confidence 3 · eval date 2025-12-11
GPT-5.1 Codex
1191.0
Rank #47/66 · confidence 1 · eval date 2025-10-15
GPT-5.2
winner1224.0
Rank #37/66 · confidence 3 · eval date 2025-12-11
GPT-5.1 Codex
70.0
Rank #39/86 · confidence 1 · eval date 2025-10-15
GPT-5.2
winner75.4
Rank #21/86 · confidence 3 · eval date 2025-12-11
GPT-5.1 Codex
26.2
Rank #11/20 · confidence 1 · eval date 2025-10-15
GPT-5.2
winner34.3
Rank #7/20 · confidence 3 · eval date 2025-12-11
GPT-5.1 Codex
winner49.7
Rank #24/50 · confidence 1 · eval date 2025-10-15
GPT-5.2
46.5
Rank #29/50 · confidence 3 · eval date 2025-12-11
GPT-5.1 Codex
83.0
Rank #50/84 · confidence 1 · eval date 2025-10-15
GPT-5.2
winner84.8
Rank #44/84 · confidence 3 · eval date 2025-12-11
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 speed / latency 56 tok/s / 1798ms input / output No data |
15 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 |
5 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 |
5 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 |
5 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/request | GPT-5.2 gpt-5.2 speed / latency No data input / output $0/request | |
GPT-5.1 Codex gpt-5.1-codex speed / latency No data input / output $0.0041/request | GPT-5.2 gpt-5.2-2025-12-11 speed / latency No data input / output $0.719/M | |
GPT-5.1 Codex gpt-5.1-codex speed / latency No data input / output $0.0068/request | GPT-5.2 gpt-5.2-chat-latest speed / latency No data input / output $1.80/M |
Weighted outcome: GPT-5.2. 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 |
|---|
