Data points: 88
Model compare
The readout for GPT-5.1 Codex Max 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 10 to 90.
Evidence depth
88 data points
Includes 12 benchmark rows, 0 audit samples, and 8 provider examples.
Selection signal
Start with GPT-5.2 Codex
The charts below split 20 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 Max and GPT-5.2 Codex: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5.1 Codex Max | GPT-5.2 Codex |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 10.0 pts | 90.0 pts |
| Benchmark category leads | 0 categories | 5 categories |
| Operational advantages | Cheapest input price, Average speed | First-token latency, Provider coverage |
| Context window | 400K tokens | 400K tokens |
| Max output | 128K tokens | 128K tokens |
| Modalities | Input TextImage Output Text | Input Text |
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 Max | GPT-5.2 Codex |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Dec 2025 | Jan 2026 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | openai/gpt-5.1-codex-max | openai/gpt-5.2-codex |
| References | No data | No data |
This report only uses LMSpeed data for GPT-5.1 Codex Max and GPT-5.2 Codex: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5.1 Codex Max
GPT-5.1 Codex Max has these operational advantages: Cheapest input price, Average speed.
GPT-5.2 Codex
GPT-5.2 Codex is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge, Instruction following) and operational dimensions (First-token latency, 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 Max
52.3
Avg. score
GPT-5.2 Codex
55.5
GPT-5.2 Codex leads by 1.2
GPT-5.2 Codex leads by 7.0
GPT-5.2 Codex leads by 3.9
GPT-5.2 Codex leads by 0.9
No data
No data
No data
GPT-5.2 Codex leads by 2.9
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5.1 Codex Max
67.3
Rank #30/89 · confidence 1 · eval date 2025-11-19
GPT-5.2 Codex
winner75.7
Rank #1/89 · confidence 1 · eval date 2025-12-18
GPT-5.1 Codex Max
5.7
Rank #30/73 · confidence 1 · eval date 2025-11-19
GPT-5.2 Codex
winner8.7
Rank #26/73 · confidence 1 · eval date 2025-12-18
GPT-5.1 Codex Max
40.2
Rank #56/96 · confidence 1 · eval date 2025-11-19
GPT-5.2 Codex
winner54.6
Rank #7/96 · confidence 1 · eval date 2025-12-18
GPT-5.1 Codex Max
22.2
Rank #20/33 · confidence 1 · eval date 2025-11-19
GPT-5.2 Codex
winner37.9
Rank #11/33 · confidence 1 · eval date 2025-12-18
GPT-5.1 Codex Max
39.2
Rank #23/90 · confidence 1 · eval date 2025-11-19
GPT-5.2 Codex
winner40.7
Rank #20/90 · confidence 1 · eval date 2025-12-18
GPT-5.1 Codex Max
86.0
Rank #40/96 · confidence 1 · eval date 2025-11-19
GPT-5.2 Codex
winner89.9
Rank #21/96 · confidence 1 · eval date 2025-12-18
GPT-5.1 Codex Max
23.4
Rank #45/96 · confidence 1 · eval date 2025-11-19
GPT-5.2 Codex
winner33.5
Rank #24/96 · confidence 1 · eval date 2025-12-18
GPT-5.1 Codex Max
34.7
Rank #46/99 · confidence 1 · eval date 2025-11-19
GPT-5.2 Codex
winner40.1
Rank #28/99 · confidence 1 · eval date 2025-12-18
GPT-5.1 Codex Max
winner74.4
Rank #48/90 · confidence 1 · eval date 2025-11-19
GPT-5.2 Codex
72.8
Rank #54/90 · confidence 1 · eval date 2025-12-18
GPT-5.1 Codex Max
72.5
Rank #36/57 · confidence 1 · eval date 2025-11-19
GPT-5.2 Codex
winner76.3
Rank #22/57 · confidence 1 · eval date 2025-12-18
GPT-5.1 Codex Max
70.0
Rank #39/86 · confidence 1 · eval date 2025-11-19
GPT-5.2 Codex
winner77.6
Rank #8/86 · confidence 1 · eval date 2025-12-18
GPT-5.1 Codex Max
83.0
Rank #50/84 · confidence 1 · eval date 2025-11-19
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 Codex Max | 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 Codex Max | GPT-5.2 Codex |
|---|---|---|
5 tests | GPT-5.1 Codex Max 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 Codex Max speed / latency 46 tok/s / 5283ms input / output No data | GPT-5.2 Codex speed / latency N/A / N/A input / output No data |
5 tests | GPT-5.1 Codex Max speed / latency N/A / N/A input / output No data | GPT-5.2 Codex speed / latency 55 tok/s / 5209ms input / output No data |
3 tests | GPT-5.1 Codex Max speed / latency 72 tok/s / 7976ms input / output No data | GPT-5.2 Codex speed / latency N/A / N/A input / output No data |
0 tests | GPT-5.1 Codex Max speed / latency N/A / N/A input / output No data | GPT-5.2 Codex speed / latency N/A / N/A input / output No data |
GPT-5.1 Codex Max gpt-5.1-codex-max-2025-12-04 speed / latency No data input / output $0/request | GPT-5.2 Codex gpt-5.2-codex speed / latency No data input / output $0/request | |
GPT-5.1 Codex Max gpt-5.1-codex-max speed / latency No data input / output $0.0062/request | GPT-5.2 Codex gpt-5.2-codex-xhigh speed / latency No data input / output $0.360/M | |
GPT-5.1 Codex Max gpt-5.1-codex-max speed / latency No data input / output $0.010/request | GPT-5.2 Codex gpt-5.2-codex-xhigh speed / latency No data input / output $0.240/M |
Weighted outcome: GPT-5.2 Codex. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Output
| Features | Text inputImage inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
