Data points: 102
Model compare
The readout for GPT-5.1 and GPT-5.2 Codex, before the detailed comparison sheet.
Weighted outcome: GPT-5.2 Codex. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.2 Codex
GPT-5.2 Codex has the higher weighted result; Model A / B score 32 to 68.
Evidence depth
102 data points
Includes 19 benchmark rows, 0 audit samples, and 6 provider examples.
Selection signal
Start with GPT-5.2 Codex
The charts below split 25 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 and GPT-5.2 Codex: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5.1 | GPT-5.2 Codex |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 32.0 pts | 68.0 pts |
| Benchmark category leads | 1 categories | 4 categories |
| Operational advantages | Cheapest input price, Average speed, First-token latency, Free providers | Provider coverage |
| Context window | 400K tokens | 400K tokens |
| Max output | 128K tokens | 128K tokens |
| Modalities | Input ImageTextFile 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-5.1 | GPT-5.2 Codex |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Nov 2025 | Jan 2026 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | openai/gpt-5.1 | openai/gpt-5.2-codex |
| References | No data | No data |
This report only uses LMSpeed data for GPT-5.1 and GPT-5.2 Codex: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5.1
GPT-5.1 is stronger in benchmark categories (Knowledge) and operational dimensions (Cheapest input price, Average speed, First-token latency, Free providers).
GPT-5.2 Codex
GPT-5.2 Codex is stronger in benchmark categories (Agents, Coding, Reasoning, Instruction following) and operational dimensions (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
52
Avg. score
GPT-5.2 Codex
55.5
GPT-5.2 Codex leads by 3.6
GPT-5.2 Codex leads by 9.2
GPT-5.2 Codex leads by 7.0
GPT-5.1 leads by 2.1
GPT-5.1
No data
No data
GPT-5.2 Codex leads by 1.9
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5.1
winner$1.25/M
Rank #107/162 · confidence 4
GPT-5.2 Codex
$1.75/M
Rank #120/162 · confidence 4
GPT-5.1
winner$3.44/M
Rank #117/162 · confidence 4
GPT-5.2 Codex
$4.81/M
Rank #132/162 · confidence 4
GPT-5.1
winner$10.00/M
Rank #120/162 · confidence 4
GPT-5.2 Codex
$14.00/M
Rank #133/162 · confidence 4
GPT-5.1
75.0
Rank #3/89 · confidence 1 · eval date 2025-11-13
GPT-5.2 Codex
winner75.7
Rank #1/89 · confidence 1 · eval date 2025-12-18
GPT-5.1
87.3%
Rank #33/188 · confidence 4
GPT-5.2 Codex
winner89.9%
Rank #21/188 · confidence 4
GPT-5.1
26.5%
Rank #40/187 · confidence 4
GPT-5.2 Codex
winner33.5%
Rank #24/187 · confidence 4
GPT-5.1
4.9
Rank #34/73 · confidence 1 · eval date 2025-11-13
GPT-5.2 Codex
winner8.7
Rank #26/73 · confidence 1 · eval date 2025-12-18
GPT-5.1
43.3%
Rank #42/185 · confidence 4
GPT-5.2 Codex
winner54.6%
Rank #6/185 · confidence 4
GPT-5.1
43.3
Rank #45/96 · confidence 1 · eval date 2025-11-13
GPT-5.2 Codex
winner54.6
Rank #8/96 · confidence 1 · eval date 2025-12-18
GPT-5.1
24.6
Rank #18/33 · confidence 1 · eval date 2025-11-13
GPT-5.2 Codex
winner37.9
Rank #11/33 · confidence 1 · eval date 2025-12-18
GPT-5.1
37.6
Rank #31/90 · confidence 1 · eval date 2025-11-13
GPT-5.2 Codex
winner40.7
Rank #20/90 · confidence 1 · eval date 2025-12-18
GPT-5.1
87.3
Rank #36/96 · confidence 1 · eval date 2025-11-13
GPT-5.2 Codex
winner89.9
Rank #22/96 · confidence 1 · eval date 2025-12-18
GPT-5.1
26.5
Rank #39/96 · confidence 1 · eval date 2025-11-13
GPT-5.2 Codex
winner33.5
Rank #24/96 · confidence 1 · eval date 2025-12-18
GPT-5.1
36.9
Rank #42/99 · confidence 1 · eval date 2025-11-13
GPT-5.2 Codex
winner40.1
Rank #29/99 · confidence 1 · eval date 2025-12-18
GPT-5.1
51.3
Rank #65/90 · confidence 1 · eval date 2025-11-13
GPT-5.2 Codex
winner72.8
Rank #53/90 · confidence 1 · eval date 2025-12-18
GPT-5.1
75.5
Rank #23/57 · confidence 1 · eval date 2025-11-13
GPT-5.2 Codex
winner76.3
Rank #22/57 · confidence 1 · eval date 2025-12-18
GPT-5.1
72.9
Rank #30/86 · confidence 1 · eval date 2025-11-13
GPT-5.2 Codex
winner77.6
Rank #8/86 · confidence 1 · eval date 2025-12-18
GPT-5.1
41.2
Rank #35/50 · confidence 1 · eval date 2025-11-13
GPT-5.2 Codex
winner51.8
Rank #19/50 · confidence 1 · eval date 2025-12-18
GPT-5.1
81.9
Rank #52/84 · confidence 1 · eval date 2025-11-13
GPT-5.2 Codex
winner92.1
Rank #30/84 · confidence 1 · eval date 2025-12-18
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.1 | GPT-5.2 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-5.1 | GPT-5.2 Codex |
|---|---|---|
10 tests | GPT-5.1 speed / latency 137 tok/s / 3299ms input / output No data | GPT-5.2 Codex speed / latency N/A / N/A input / output No data |
7 tests | GPT-5.1 speed / latency 139 tok/s / 1654ms input / output No data | GPT-5.2 Codex speed / latency 67 tok/s / 4708ms input / output No data |
5 tests | GPT-5.1 speed / latency N/A / N/A input / output No data | GPT-5.2 Codex speed / latency 30 tok/s / 4723ms input / output No data |
5 tests | GPT-5.1 speed / latency 96 tok/s / 1862ms input / output No data | GPT-5.2 Codex speed / latency N/A / N/A input / output No data |
5 tests | GPT-5.1 speed / latency N/A / N/A input / output No data | GPT-5.2 Codex speed / latency 57 tok/s / 2370ms input / output No data |
GPT-5.1 gpt-5.1 speed / latency No data input / output $0/request | GPT-5.2 Codex gpt-5.2-codex speed / latency No data input / output $0/request |
Weighted outcome: GPT-5.2 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 |
|---|
